In this article

Overview

You can use this Snap to convert documents to the Parquet format and write the data to HDFS, ADL (Azure Data Lake), ABFS (Azure Blob File Storage), WASB (Azure storage), or an S3 bucket. This Snap supports a nested schema such as LIST and MAP. You can also use this Snap to write schema information to the Catalog Insert Snap.

This Snap supports HDFS, ADL (Azure Data Lake), ABFS (Azure Blob File Storage), WASB (Azure storage), and S3 protocols.

Snap Type

The Parquet Writer Snap is a Write-type Snap.

Prerequisites

You must have access and permission to write to HDFS, ADL (Azure Data Lake), ABFS (Azure Data Lake Storage Gen 2), WASB (Azure storage), or AWS S3.

Support for Ultra Pipelines

Works in Ultra Pipelines.

Supported Versions

The Parquet Writer Snap is tested against Windows Server 2008, 2010, and 2012.

Limitations

Auto schema generation in this Snap involves the exclusion of null fields. For example, if the Snap receives ten input documents during preview execution, and four of these documents contain null values for certain fields in all instances, those four fields are disregarded during schema generation. The schema only includes fields with at least one non-null value among the preview input documents.
"Generate template" is unsupported for a nested structure like MAP and LIST type. Generate template is a link within the schema editor accessed through the Edit Schema button.
All expression Snap properties can be evaluated (when the '=' button is pressed) from pipeline parameters only, not from input documents from upstream Snaps. Input documents are data to be formatted and written to the target files.
The security model configured for the Groundplex (SIMPLE or KERBEROS authentication) must match the security model of the remote server. Due to the limitations of the Hadoop library, we can only create the necessary internal credentials to configure the Groundplex.
Parquet Snaps work well in a Linux environment. However, due to limitations in the Hadoop library on Windows, their functioning in a Windows environment may not always be as expected. We recommend you use a Linux environment for working with Parquet Snaps.

To use the Parquet Writer Snap on a Windows Snaplex, follow these steps:

Download hadoop.dlland winutils.exe https://github.com/cdarlint/winutils/tree/master/hadoop-3.2.2/bin (SnapLogic’s Hadoop version is 3.2.2)
Create a temporary directory.
Place the hadoop.dlland winutils.exe files in this path: c:\winutils\bin
Set the environment variable HADOOP_HOME to point to c:\winutils
Add c:\winutils\bin to the environment variable PATH as shown below:
Add the JVM options in the Windows Snaplex:jcc.jvm_options= -Djava.library.path=c:\winutils\bin
If you already have an existing jvm_options, then add: "-Djava.library.path=C:\winutils\bin" after the space.
For example:jcc.jvm_options = -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=8000 -Djava.library.path=c:\winutils\bin
Restart the JCC for configurations to take effect.

Known Issues

None.

Snap Views

Type

Format

Number of Views

Examples of Upstream and Downstream Snaps

Description

Input

Document

Min: 1
Max: 2

Mapper

This Snap has one or two document input views. When you enable the second input view, the Snap ignores other schema settings such as Schema button or Hive Metastore related properties, but it accepts the schema from the second input view only. However, when you disable the second input view, the Snap prepares to receive the Schema with the provided information on the Hive Metastore URL property. The supported data types are:
- Primitive: Boolean, Integer, Float, double, and byte-array
- Local: map, list
The Snap expects a Hive Execute Snap that contains the "Describe table" statement in the second input view.

Output

Document

Min: 0
Max: 1

Mapper

A document with a filename for each Parquet file written. For example: {"filename" : "hdfs://localhost/tmp/2017/april/sample.parquet"}

Error

Error handling is a generic way to handle errors without losing data or failing the Snap execution. You can handle the errors that the Snap might encounter while running the Pipeline by choosing one of the following options from the When errors occur list under the Views tab. The available options are:

Stop Pipeline Execution: Stops the current pipeline execution when the Snap encounters an error.
Discard Error Data and Continue: Ignores the error, discards that record, and continues with the remaining records.
Route Error Data to Error View: Routes the error data to an error view without stopping the Snap execution.

Learn more about Error handling in Pipelines.

Snap Settings

Asterisk ( * ): Indicates a mandatory field.
Suggestion icon (Emoji :Suggest_Icon: ): Indicates a list that is dynamically populated based on the configuration.
Expression icon (Emoji :Expression_Enabler: ): Indicates the value is an expression (if enabled) or a static value (if disabled). Learn more about Using Expressions in SnapLogic.
Add icon ( ): Indicates that you can add fields in the field set.
Remove icon ( Emoji :Remove_icon: ): Indicates that you can remove fields from the field set.
Upload icon (Emoji :Upload_icon: ): Indicates that you can upload files.

Field Name	Field Type	Description
Label* Default Value: Parquet Writer Example: Parquet Writer	String	Specify a unique name for the Snap.
Directory Default Value: hdfs://<hostname>:<port>/ Example: hdfs://ec2-54-198-212-134.compute-1.amazonaws.com:8020/user/john/input/ webhdfs://cdh-ga-2.fullsail.yourcompany.com:50070/user/ec2-user/csv/ _dirname	String/Expression/Suggestion	Specify the file path to a directory to read data from. The path must be in the following format: `hdfs://<hostname>:<port>/` All files within the directory must be Parquet formatted. The following file storage systems are supported: hdfs Protocol: hdfs://<hostname>:<port>/<path to directory> Example: hdfs://localhost:8020/tmp S3 Protocol: S3://<testbucket>/<key name prefix> Example: S3://test-bucker/tmp wasb Protocol: wasb:///<storage container>/path to directory> Example: wasb:///container/tmp wasbs Protocol: wasbs:///<storage container>/path to directory> Example: wasbs:///container/tmp adl Protocol: adl://<store name>/<path to directory> Example: adl://storename/tmp adls Protocol: adls://<store name>/<path to directory> Example: adls://storename/tmp abfs Protocol: abfs:///filesystem/<path>/ Example: abfs://filesystem1/core.windows.net/dirl abfs Protocol: abfs://<filesystem>@<accountname>.<endpoint>/<path> Example: abfs://filesystem2@adlsgen2test1.dfs.core.windows.net/dirl abfss Protocol: abfss:///filesystem/<path>/ Example: abfss://filesystem1/core.windows.net/dirl abfss Protocol: abfss://<filesystem>@<accountname>.<endpoint>/<path> Example: abfss://filesystem2@adlsgen2test1.dfs.core.windows.net/dirl SnapLogic automatically appends `azuredatalakestore.net` to the store name you specify when using Azure Data Lake; therefore, you do not have to add `azuredatalakestore.net` to the URI while specifying the directory. The Directory property is not used in the Pipeline execution or preview and used only in the Suggest operation. When you click on the Suggest icon, the Snap displays a list of subdirectories under the given directory. It generates the list by applying the value of the Filter property.
File Filter Default Value: * Example: **	String/Expression	Specify the Glob file pattern. Use glob patterns to display a list of directories or files when you click the Suggestion icon in the Directory or File property. A complete glob pattern is formed by combining the value of the Directory property with the Filter property. If the value of the Directory property does not end with "/", the Snap appends one, so that the value of the Filter property is applied to the directory specified by the Directory property. Glob Pattern Interpretation Rules The following rules are used to interpret glob patterns: - The * character matches zero or more characters of a name component without crossing directory boundaries. For example, the .csv pattern matches a path that represents a file name ending in .csv, and .* matches all file names that contain a period. - The characters match zero or more characters across directories; therefore, it matches all files or directories in the current directory and in its subdirectories. For example, /home/ matches all files and directories in the /home/ directory. - The ? character matches exactly one character of a name component. For example, 'foo.?' matches file names that start with 'foo.' and are followed by a single-character extension. - The \ character is used to escape characters that would otherwise be interpreted as special characters. The expression \\ matches a single backslash, and \{ matches a left brace, for example. - The ! character is used to exclude matching files from the output. - The [ ] characters form a bracket expression that matches a single character of a name component out of a set of characters. For example, '[abc]' matches 'a', 'b', or 'c'. The hyphen (-) may be used to specify a range, so '[a-z]' specifies a range that matches from 'a' to 'z' (inclusive). These forms can be mixed, so '[abce-g]' matches 'a', 'b', 'c', 'e', 'f' or 'g'. If the character after the [ is a ! then it is used for negation, so '[!a-c]' matches any character except 'a', 'b', or 'c'. - Within a bracket expression, the '', '?', and '\' characters match themselves. The '-' character matches itself if it is the first character within the brackets, or the first character after the !, if negating. - The '{ }' characters are a group of sub-patterns where the group returns a match if any sub-pattern in the group matches the contents of a target directory. The ',' character is used to separate sub-patterns. Groups cannot be nested. For example, the pattern '.{csv, json}' matches file names ending with '.csv' or '.json'. - Leading dot characters in a file name are treated as regular characters in match operations. For example, the '' glob pattern matches file name ".login". - All other characters match themselves. Examples: '.csv' matches all files with a csv extension in the current directory only. '*.csv' matches all files with a csv extension in the current directory and in all its subdirectories. [!{.pdf,.tmp}] excludes all files with the extension PDF or TMP.
File Default Value: N/A Example: sample.csv tmp/another.csv _filename	String/Expression/Suggestion	Specify the filename or a relative path to a file under the directory given in the Directory property. It should not start with a URL separator "/". The File value can be a JavaScript expression which will be evaluated with values from the input view document. When you click the Suggest icon, the Snap displays a list of regular files under the directory in the Directory property. It generates the list by applying the value of the Filter property.
Hive Metastore URL Default Value: N/A Example: thrift://localhost:9083	String/Expression	Specify the URL of the Hive Metastore to assist in setting the schema along with the database and table setting. If the data being written has a Hive schema, then the Snap can be configured to read the schema instead of manually entering it. Set the value to a Hive Metastore URL where you define the schema.
Database Default value: N/A	String/Expression/Suggestion	Specify the Hive Metastore database which holds the schema for the outgoing data.
Table Default value: N/A	String/Expression/Suggestion	Specify the table whose schema should be used for formatting the outgoing data.
Fetch Hive Schema at Runtime Default value: Deselected	Checkbox	Select this checkbox to fetch the schema from the Metastore table before writing. The Snap fails to write if it cannot make connection to the metastore or the table does not exist during the Pipeline's execution. Will use the metastore schema instead of the one set in the Snap's Edit Schema property if this is checked.
Edit Schema	Button	Specify a valid Parquet schema that describes the data. The schema can be specified based off a Hive Metastore table schema or generated from suggest data. Save the pipeline before editing the schema to generate suggest data that assists in specifying the schema based off of the schema of incoming documents. If no suggest data is available, then an example schema is generated along with documentation. Alter one of those schemas to describe the input data. The Parquet schema can also be written manually. A schema is defined by a list of fields and here is an example describing the contact information of a person. Click here to expand... After defining the message type, a list of fields are given. A field is comprised of a repetition, a type, and the field name. Available repetitions are required, optional, and repeated. Each field has a type. The primitive types include: `binary -used for strings` `fixed_len_byte_array - used for byte arrays of fixed length` `boolean - a 1 bit boolean value` `int32 - a 32 bit integer` `int64 - a 64 bit integer` `int96 - a 96 bit integer` `float - a 32 bit floating point number` `double - a 64 bit floating point number` These types can be annotated with a logical type to specify how the application should interpret the data. The Logical types include: `UTF8 - used with binary to specify the string as UTF8 encoded` `INT_8 - used with int32 to specify the int as an 8 bit signed integer` `INT_16 - used with int32 to specify the int as a 16 bit signed integer` Unsigned types - may be used to produce smaller in-memory representations of the data. If the stored value is larger than the maximum allowed by int32 or int64, then the behavior is undefined. `UINT_8 - used with int32 to specify the int as an 8 bit unsigned integer` `UINT_16 - used with int32 to specify the int as a 16 bit unsigned integer` `UINT_32 - used with int32 to specify the int as a 32 bit unsigned integer` `UINT_64 - used with int64 to specify the int as a 64 bit unsigned integer` DECIMAL(precision, scale) - used to describe arbitrary-precision signed decimal numbers of the form value * 10^(-scale) to the given precision. The annotation can be with int32, int64, fixed_len_byte_array, binary. See the Parquet documentation for limits on precision that can be given. DATE - used with int32 to specify the number of days since the Unix epoch, 1 January 1970 Note: This Snap supports only the following date format: yyyy-MM-dd. `TIME_MILLIS -` used with int32 to specify the number of milliseconds after midnight `TIMESTAMP_MILLIS -` used with int64 to store the number of milliseconds from the Unix epoch, 1 January 1970 `INTERVAL -` used with a fixed_len_byte_array of length 12, where the array stores 3 unsigned little-endian integers. These integers specify a number in months a number in days a number in milliseconds `JSON -` used with binary to represent an embedded JSON document `BSON -` used for an embedded BSON document The following is an example of a schema using all the primitive and some examples of logical types: message document { # Primitive Types optional int64 32_num; optional int64 64_num; optional boolean truth; optional binary message; optional float pi; optional double e; optional int96 96_num; optional fixed_len_byte_array (1) one_byte; # Logical Types optional binary snowman (UTF8); optional int32 8_num (INT_8); optional int32 16_num (INT_16); optional int32 u8_num (UINT_8); optional int32 u16_num (UINT_16); optional int32 u32_num (UINT_32); optional int64 u64_num (UINT_64); optional int32 dec_num (DECIMAL(5,2)); optional int32 jan7 (DATE); optional int32 noon (TIME_MILLIS); optional int64 jan7_epoch (TIMESTAMP_MILLIS); optional binary embedded (JSON); } "Generate template" will not work for nested structure like MAP and LIST type.
Compression*	Dropdown list	Select the type of compression to use when writing the file. The available options are: NONE SNAPPY GZIP LZO To use LZO compression, you must explicitly enable the LZO compression type on the cluster (as an administrator) for the Snap to recognize and run the format. For more information, see Data Compression. For detailed guidance on setting up LZO compression, see Cloudera documentation on Installing the GPL Extras Parcel. Many compression algorithms require both Java and system libraries and will fail if the latter is not installed. If you see unexpected errors, ask your system administrator to verify that all the required system libraries are installed–they are typically not installed by default. The system libraries will have names such as liblzo2.so.2 or libsnappy.so.1 and will probably be located in the /usr/lib/x86_64-linux-gnu directory.
Partition by Default Value: N/A	String/Suggestion	Specify or select the key which will be used to get the 'Partition by' folder name. All input documents should contain this key name or an error document will be written to the error view. Refer to the 'Partition by' example below for an illustration.
Azure SAS URI Properties	Shared Access Signatures (SAS) properties of the Azure Storage account.
SAS URI	String/Expression	Specify the Shared Access Signatures (SAS) URI that you want to use to access the Azure storage blob folder specified in the Azure Storage Account. You can get a valid SAS URI either from the Shared access signature in the Azure Portal or by generating from the SAS Generator Snap. If SAS URI value is provided in the Snap settings, then the account settings (in case any account is attached) are ignored.
Decimal Rounding Mode Default Value: Half up Example: Up	Dropdown list	Select the required rounding method for decimal values when they exceed the required number of decimal places. The available options are: Half up Half down Half even Up Down Ceiling Floor Truncate
Snap Execution	Dropdown list	Select one of the following three modes in which the Snap executes: Validate & Execute: Performs limited execution of the Snap, and generates a data preview during Pipeline validation. Subsequently, performs full execution of the Snap (unlimited records) during Pipeline runtime. Execute only: Performs full execution of the Snap during Pipeline execution without generating preview data. Disabled: Disables the Snap and all Snaps that are downstream from it.

Troubleshooting

Error

Reason

Resolution

Unable to connect to the Hive Metastore.

This error occurs when the Parquet Writer Snap is unable to fetch schema for Kerberos-enabled Hive Metastore.

Pass the Hive Metastore's schema directly to the Parquet Writer Snap. To do so:

Enable the 'Schema View' in the Parquet Writer Snap by adding the second Input View.
1. Connect a Hive Execute Snap to the Schema View. Configure the Hive Execute Snap to execute the DESCRIBE TABLE command to read the table metadata and feed it to the schema view.

Parquet Snaps may not work as expected in Windows environment.

Because of the limitations in the Hadoop library on Windows, the functioning of Parquet Snaps is not as expected.

To use the Parquet Writer Snap on a Windows Snaplex, follow these steps:

Create a temporary directory. For example: C:\test\.
Place two files, "hadoop.dll" and "winutils.exe", in the newly created temporary directory. Use this link https://github.com/cdarlint/winutils/tree/master/hadoop-3.2.2/bin to download hadoop.dll and winutills.exe. (SnapLogic’s code base Hadoop is 3.2.2).
Add the JVM options in the Windows Plex as shown below:
jcc.jvm_options = -Djava.library.path=C:\\test
If you already have existing jvm_options, then add the following "-Djava.library.path=C:\\test" after the space. For example:
jcc.jvm_options = -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=8000 -Djava.library.path=C:\\test
Restart the JCC for configurations to take effect.

Additional Information

Write to S3 files with HDFS version CDH 5.8 or later

When running the HDFS version later than CDH 5.8, the Hadoop Snap Pack may fail to write to S3 files. To overcome this, make the following changes in the Cloudera manager:

Go to HDFS configuration.
In Cluster-wide Advanced Configuration Snippet (Safety Valve) for core-site.xml, add an entry with the following details:
- Name: fs.s3a.threads.max
- Value: 15
Click Save.
Restart all the nodes.
Under Restart Stale Services, select Re-deploy client configuration.
Click Restart Now.

Temporary Files

During execution, data processing on Snaplex nodes occurs principally in-memory as streaming and is unencrypted. When larger datasets are processed that exceed the available compute memory, the Snap writes Pipeline data to local storage as unencrypted to optimize the performance. These temporary files are deleted when the Snap/Pipeline execution completes. You can configure the temporary data's location in the Global properties table of the Snaplex's node properties, which can also help avoid Pipeline errors due to the unavailability of space. For more information, see Temporary Folder in Configuration Options.

Examples

Parquet Writer Snap with the Second Input View

The following example pipeline demonstrates the usage of the second input view to receive the table metadata. You can provide the Hive Metastore information in the Hive Metastore URL field, wherein a single input view is sufficient.

When you enable the second input view, the Snap overrides other schema settings, such as the schema within the Edit Schema box or the Hive Metastore-related properties and only accepts the schema from the second input view.
When you disable the second input view, the Snap receives the Schema from the Hive Metastore URL field.

The Parquet Writer Snap configuration with Directory path:

The Parquet Writer Snap View:

The Hive Execute Snap with the table metadata information to pass to the second input view of the Parquet Writer Snap:

The Hive Execute Snap Output:

Parquet Writer configured to write to a local instance of HDFS

Here is an example of a Parquet Writer configured to write to a local instance of HDFS. The output is written to /tmp/parquet-example. There is no Hive Metastore configured and no compression used.

See the documentation on the Schema setting to view an example of the schema.

Parquet Writer using the Partition by

Example on "Partition by":

Assume the following input documents:

[
{
"month" : "MAR",
"day" : "01",
"msg" : "Hello, World",
"num" : 1
},
{
"month" : "FEB",
"day" : "07",
"msg" : "Hello, World",
"num" : 3
},
{
"month" : "MAR",
"day" : "01",
"msg" : "Hello, World",
"num" : 2
},
{
"month" : "FEB",
"day" : "07",
"msg" : "Hello, World",
"num" : 4
}
]

The settings of the Parquet Writer Snap are as follows:

The pipeline execution will generate two files:

hdfs://localhost:8080/tmp/FEB/07/sample.parquet
hdfs://localhost:8080/tmp/MAR/01/sample.parquet

The key-value pairs for "month" and "day" will not be included in the output files.

Parquet Reader/Writer with S3 in Standard Mode

Reading and writing Parquet files from/to AWS S3 requires an S3 account.

Create an S3 account or use an existing one.
1. If it is a regular S3 account, name the account and supply the Access-key ID and Secret key.
2. If the account is IAM role enabled Account:
  1. Select the IAM role checkbox.
  2. Leave the Access-key ID and Secret key blank.
  3. The IAM role properties are optional. You can leave them blank. To use IAM Role Properties, select the IAM Role check box.
Within the Parquet Snap, use a valid S3 oath for the directory in the format of:
s3://<bucket name>/<folder name>/.../<filename>

Inserting and Querying Custom Metadata from the Flight Metadata Table

The Pipeline in this zipped example, MetadataCatalog_Insert_Read_Example.zip, demonstrates how you can:

Use the Catalog Insert Snap to update metadata tables.
Use the Catalog Query Snap to read the updated metadata information.

In this example:

We import a file containing the metadata.
We create a parquet file using the data in the imported file
We insert metadata that meets specific requirements into a partition in the target table.
We read the newly-inserted metadata using the Catalog Query Snap.

Understanding the Pipeline

Downloads

Download and import the Pipeline into SnapLogic.
Configure Snap accounts, as applicable.
Provide Pipeline parameters, as applicable.

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Snap Pack History

Click to view/expand

Release	Snap Pack Version	Date	Type	Updates
May 2024	437patches26370	22 May 2024	Latest	Enhanced the HDFS Writer Snap with the Write empty file checkbox to enable you to write an empty or a 0-byte file to all the supported protocols that are recognized and compatible with the target system or destination.
May 2024	main26341	08 May 2024	Stable	The Azure Data Lake Account has been removed from the Hadoop Snap Pack because Microsoft retired the Azure Data Lake Storage Gen1 protocol on February 29, 2024. We recommend replacing your existing Azure Data Lake Accounts (in Binary or Hadoop Snap Packs) with other Azure Accounts.
February 2024	436patches25902	10 Apr 2024	Latest	Fixed a memory management issue in the HDFS Writer, HDFS ZipFile Writer, ORC Writer, and Parquet Writer Snaps, which previously caused out-of-memory errors when multiple Snaps were used in the pipeline. The Snap now conducts a pre-allocation memory check, dynamically adjusting the write buffer size based on available memory resources when writing to ADLS.
February 2024	435patches25410	06 Mar 2024	Latest	Enhanced the AWS S3 Account for Hadoop with an External ID that enables you to access Hadoop resources securely.
February 2024	main25112	14 Feb 2024	Stable	Updated and certified against the current SnapLogic Platform release.
November 2023	435patches23904	20 Nov 2023	Latest	Fixed an issue with the Parquet Writer Snap that displayed an error `Failed to write parquet data` when the decimal value passed from the second input view exceeded the specified scale. Fixed an issue with the Parquet Writer Snap that previously failed to handle the conversion of BigInt/int64 (larger numbers) after the 4.35 GA now converts them accurately.
November 2023	435patches23780	15 Nov 2023	Latest	Fixed an issue related to error routing to the output view. Also fixed a connection timeout issue.
November 2023	main23721	08 Nov 2023	Stable	Updated and certified against the current SnapLogic Platform release.
August 2023	434patches23173	11 Oct 2023	Latest	Enhanced the Parquet Writer Snap with a Decimal Rounding Mode dropdown list to enable the rounding method for decimal values when the number exceeds the required decimal places.
August 2023	434patches22662	25 Aug 2023	Latest	Enhanced the Parquet Writer Snap with the support for LocalDate and DateTime. The Snap now shows the schema suggestions for LocalDate and DateTime correctly. Enhanced the Parquet Reader Snap with the Use datetime types checkbox that supports LocalDate and DateTime datatypes. Behavior change: When you select the Use datetime types checkbox in the Parquet Reader Snap, the Snap displays the LocalDate and DateTime in the output for INT32 (DATE) and INT64 (TIMESTAMP_MILLIS) columns. When you deselect this checkbox, the columns retain the previous datatypes and display `string` and `integer` values in the output.
August 2023	main22460	16 Aug 2023	Stable	Updated and certified against the current SnapLogic Platform release.
May 2023	433patches22180	08 Aug 2023	Latest	Introduced the HDFS Delete, which deletes the specified file, group of files, or directory from the supplied path and protocol in the Hadoop Distributed File System (HDFS).
May 2023	433patches21494	14 Jun 2023	Latest	The Hadoop Directory Browser Snap now returns all the output documents as expected after implementing pagination for the ABFS protocol.
May 2023	main21015	10 May 2023	Stable	Upgraded with the latest SnapLogic Platform release.
February 2023	432patches20820	28 Apr 2023	Latest	Fixed an authorization issue that occurs with the Parquet Writer Snap when it receives empty document input.
February 2023	432patches20209	31 Mar 2023	Latest	The Apache Commons Compress library has been upgraded to version 1.22.
February 2023	432patches20139	09 Mar 2023	Latest	The Kerberos Account that is available for a subset of snaps in the Hadoop Snap pack now supports a configuration that enables you to read from and write to the Hadoop Distributed File System (HDFS) managed by multiple Hadoop clusters. You can specify the location of the Hadoop configuration files in the Hadoop config directory field. The value in this field overrides the value that is set on the Snaplex system property used for configuring a single cluster.
February 2023	main19844	09 Feb 2023	Stable	Upgraded with the latest SnapLogic Platform release.
November 2022	main18944	10 Nov 2022	Stable	The AWS S3 and S3 Dynamic accounts now support a maximum session duration of an IAM role defined in AWS.
August 2022	main17386	11 Aug 2022	Stable	Extended the AWS S3 Dynamic Account support to ORC Reader and ORC Writer Snaps to support AWS Security Token Service (STS) using temporary credentials.
4.29 Patch	429patches16630	21 Jul 2022	Latest	Extended the AWS S3 Dynamic Account support to ORC Reader and ORC Writer Snaps to support AWS Security Token Service (STS) using temporary credentials. Fixed an issue in the following Snaps that use AWS S3 dynamic account, where the Snaps displayed the security credentials like Access Key, Secret Key, and Security Token in the logs. Now, the security credentials in the logs are blurred for the Snaps that use AWS S3 dynamic account. ORC Reader ORC Writer Parquet Reader Parquet Writer
4.29	main15993	14 May 2022	Stable	Enhanced the AWS S3 Account for Hadoop account to include the S3 Region field that allows cross-region or proxied cross-region access to S3 buckets in the Parquet Reader and Parquet Writer Snaps.
4.28 Patch	428patches15216	23 Mar 2022	Latest	Added the AWS S3 Dynamic account for Parquet Reader and Parquet Writer Snaps.
4.28	main14627	12 Feb 2022	Stable	Upgraded with the latest SnapLogic Platform release.
4.27 Patch	427patches13769	25 Jan 2022	Latest	Fixed an issue with the Hadoop Directory Browser Snap where the Snap was not listing the files in the given directory for Windows VM.
4.27 Patch	427patches12999	23 Nov 2021	Latest	Enhanced the Parquet Reader Snap with int96 As Timestamp checkbox, which when selected enables the Date Time Format field. You can use this field to specify a date-time format of your choice for int96 data-type fields. The int96 As Timestamp checkbox is available only when you deselect Use old data format checkbox.
4.27	main12833	13 Nov 2021	Stable	Enhanced the Parquet Writer and Parquet Reader Snaps with Azure SAS URI properties, and Azure Storage Account for Hadoop with SAS URI Auth Type. This enables the Snaps to consider SAS URI given in the settings if the SAS URI is selected in the Auth Type during account configuration.
4.26	426patches12288	19 Oct 2021	Latest	Fixed a memory leak issue when using HDFS protocol in Hadoop Snaps.
4.26	main11181	14 Aug 2021	Stable	Upgraded with the latest SnapLogic Platform release.
4.25 Patch	425patches9975	07 Jun 2021	Latest	Fixed the dependency issue in Hadoop Parquet Reader Snap while reading from AWS S3. The issue is caused due to conflicting definitions for some of the AWS classes (dependencies) in the classpath.
4.25	main9554	08 May 2021	Stable	Enhanced the HDFS Reader and HDFS Writer Snaps with the Retry mechanism that includes the following settings: Number of Retries: Specifies the maximum number of retry attempts when the Snap fails to connect to the Hadoop server. Retry Interval (seconds): Specifies the minimum number of seconds the Snap must wait before each retry attempt.
4.24 Patch	424patches9262	26 Apr 2021	Latest	Enhanced the AWS S3 Account for Hadoop to support role-based access when you select IAM role checkbox.
4.24 Patch	424patches8876	11 Mar 2021	Latest	Fixes the missing library error in Hadoop Snap Pack when running Hadoop Pipelines in JDK11 runtime.
4.24	main8556	13 Feb 2021	Stable	Upgraded with the latest SnapLogic Platform release.
4.23 Patch	423patches7440	01 Dec 2020	Latest	Fixes the issue in HDFS Reader Snap by supporting to read and write files larger than 2GB using ABFS(S) protocol.
4.23	main7430	14 Nov 2020	Stable	Upgraded with the latest SnapLogic Platform release.
4.22	main6403	12 Sep 2020	Stable	Upgraded with the latest SnapLogic Platform release.
4.21 Patch	hadoop8853	28 May 2020	Latest	Updates the Parquet Writer and Parquet Reader Snaps to support the yyyy-MM-dd format for the DATE logical type.
4.21	snapsmrc542	09 May 2020	Stable	Upgraded with the latest SnapLogic Platform release.
4.20 Patch	hadoop8776	30 Mar 2020	Latest	Updates the Hadoop Snap Pack to use the latest version of org.xerial.snappy:snappy-java for compression type Snappy, in order to resolve the java.lang.UnsatisfiedLinkError: org.xerial.snappy.SnappyNative.maxCompressedLength(I)I error.
4.20	snapsmrc535	08 Feb 2020	Stable	Upgraded with the latest SnapLogic Platform release.
4.19 Patch	hadoop8270	23 Dec 2019	Latest	Fixes an issue with the Hadoop Parquet Writer Snap wherein the Snap throws an exception when the input document includes one or all of the following: Empty lists. Lists with all null values. Maps with all null values.
4.19	snaprsmrc528	14 Nov 2019	Stable	Upgraded with the latest SnapLogic Platform release.
4.18 Patch	hadoop8033	15 Oct 2019	Latest	Fixed an issue with the Parquet Writer Snap wherein the Snap throws an error when working with WASB protocol.
4.18	snapsmrc523	10 Aug 2019	Stable	Added ADLS Gen2 support for ABFS (Azure Blob File System) and ABFSS protocols to the HDFS ZipFile Reader, HDFS ZipFile Writer, HDFS Reader, ORC Reader, Parquet Reader, and Hadoop Directory Browser Snaps. Added ADLS Gen2 support for ABFS (Azure Blob File System) and ABFSS protocols.
4.17	ALL7402	11 Jun 2019	Latest	Pushed automatic rebuild of the latest version of each Snap Pack to SnapLogic UAT and Elastic servers.
4.17	snapsmrc515	11 Jun 2019	Latest	Added the Snap Execution field to all Standard-mode Snaps. In some Snaps, this field replaces the existing Execute during preview check box.
4.16	snapsmrc508	16 Feb 2019	Stable	Added a new property, Output for each file written, to handle multiple binary input data in the HDFS Writer Snap.
4.15	snapsmrc500	15 Dec 2018	Stable	Added two new Snaps: HDFS ZipFile Reader and HDFS ZipFile Writer. Added support for the Data Catalog Snaps in Parquet Reader and Parquet Writer Snaps.
4.14 Patch	hadoop5888	02 Oct 2018	Latest	Fixed an issue wherein the Hadoop snaps were throwing an exception when a Kerberized account is provided, but the snap is run in a non-kerberized environment.
4.14	snapsmrc490	11 Aug 2018	Stable	Added the Hadoop Directory Browser Snap, which browses a given directory path in the Hadoop file system using the HDFS protocol and generates a list of all the files in the directory. It also lists subdirectories and their contents. Added support for S3 file protocol in the ORC Reader, and ORC Writer Snaps. Added support for reading nested schema in the Parquet Reader Snap.
4.13 Patch	hadoop5318	21 Jun 2018	Latest	Fixed the HDFS Reader/Writer and Parquet Reader/Writer Snaps, wherein Hadoop configuration information does not parse from the client's configuration files. Fixed the HDFS Reader/Writer and Parquet Reader/Writer Snaps, wherein User Impersonation does not work on Hadooplex.
4.13	snapsmrc486	12 May 2018	Stable	KMS encryption support added to AWS S3 account in the Hadoop Snap Pack. Enhanced the Parquet Reader, Parquet Writer, HDFS Reader, and HDFS Writer Snaps to support WASB and ADLS file protocols. Added the AWS S3 account support to the Parquet Reader and Writer Snaps. Added second input view to the Parquet Reader Snap that when enabled, accepts table schema. Supported with AWS S3, Azure Data Lake, and Azure Storage Accounts.
4.12 Patch	hadoop5132	20 Nov 2017	Latest	Fixed an issue with the HDFS Reader Snap wherein the pipeline becomes stale while writing to the output view.
4.12	snapsmrc480	17 Feb 2018	Stable	Upgraded with the latest SnapLogic Platform release.
4.11 Patch	hadoop4275		Latest	Addressed an issue with Parquet Reader Snap leaking file descriptors (connections to HDFS data nodes). The Open File descriptor values work stable now,
4.11	snapsmrc465	11 Nov 2017	Stable	Added Kerberos support to the standard mode Parquet Reader and Parquet Writer Snaps.
4.10 Patch	hadoop4001	29 Sep 2017	Latest	Supported HDFS Writer to write to the encryption zone.
4.10 Patch	hadoop3887	14 Sep 2017	Latest	Addressed the suggest issue for the HDFS Reader on Hadooplex.
4.10 Patch	hadoop3851	01 Sep 2017	Latest	ORC supports read/write from local file system. Addressed an issue to bind the Hive Metadata to Parquet Writer Schema at Runtime.
4.10 Patch	hadoop3838	23 Aug 2017	Latest	Made HDFS Snaps work with Zone encrypted HDFS.
4.10	snapsmrc414	12 Aug 2017	Stable	Updated the Parquet Writer Snap with Partition by property to support the data written into HDFS based on the partition definition in the schema in Standard mode. Support for S3 accounts with IAM Roles added to Parquet Reader and Parquet Writer HDFS Reader/Writer with Kerberos support on Groundplex (including user impersonation).
4.9 Patch	hadoop3339	25 Jul 2017	Latest	Addressed the following issues: ORC Reader passing, but ORC Writer failing when run on a Cloudplex. ORC Reader Snap is not routing error to error view. Intermittent failures with the ORC Writer
4.9.0 Patch	hadoop3020	22 May 2017	Latest	Added missing dependency org.iq80.snappy:snappy to Hadoop Snap Pack.
4.9	snapsmrc405	13 May 2017	Stable	Upgraded with the latest SnapLogic Platform release.
4.8	snapsmrc398	11 Feb 2017	Stable	Snap-aware error handling policy enabled for Spark mode in Sequence Formatter and Sequence Parser. This ensures the error handling specified on the Snap is used.
4.7.0 Patch	hadoop2343	21 Dec 2016	Latest	Spark Validation: Resolved an issue with validation failing when setting the output file permissions.
4.7	snapsmrc382	23 Nov 2016	Stable	Updated the HDFS Writer and HDFS Reader Snaps with Azure Data Lake account for standard mode pipelines. HDFS Writer: Spark mode support added to write to a specified directory in an Azure Storage Layer using the wasb file system protocol. HDFS Reader: Spark mode support added to read a single file or an HDFS directory from an Azure Storage Layer.
4.6	snapsmrc362	13 Aug 2016	Stable	The following Snaps now support error view in Spark mode: HDFS Reader, Sequence Parser. Resolved an issue in HDFS Writer Snap that sends the same data in output & error view.
4.5	snapsmrc344	18 May 2016	Stable	HDFS Reader and HDFS Writer Snaps updated to support IAM Roles for Amazon EC2. Support for Spark mode added to Parquet Reader, Parquet Writer The HBase Snaps are no longer available as of this release.
4.4.1		18 Mar 2016	Stable	Resolved an issue with Sequence Formatter not working in Spark mode. Resolved an issue with HDFSReader not using the filter set when configuring SparkExec paths.
4.4		13 Feb 2016	Stable	NEW! Parquet Reader and Writer Snaps NEW! ORC Reader and Writer Snaps Spark support added to the HDFS Reader, HDFS Writer, Sequence Formatter, and Sequence Parser Snaps. Behavior change: HDFS Writer in SnapReduce mode now requires the File property to be blank.
4.3.2		15 Jan 2016	Stable	Implemented wasbs:// protocol support in Hadoop Snap Pack. Resolved an issue with HDFS Reader unable to read all files under a folder (including all files under its subfolders) using the ** filter.

Parquet Writer