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From "Wei-Chiu Chuang (Jira)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-17292) Using lz4-java in Lz4Codec
Date Tue, 01 Jun 2021 02:27:00 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-17292?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Wei-Chiu Chuang updated HADOOP-17292:
-------------------------------------
    Release Note: 
The Hadoop's LZ4 compression codec now depends on lz4-java. The native LZ4 is performed by
the encapsulated JNI and it is no longer necessary to install and configure the lz4 system
package.

The lz4-java is declared in provided scope. Applications that wish to use lz4 codec must declare
dependency on lz4-java explicitly.

> Using lz4-java in Lz4Codec
> --------------------------
>
>                 Key: HADOOP-17292
>                 URL: https://issues.apache.org/jira/browse/HADOOP-17292
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: common
>    Affects Versions: 3.3.0
>            Reporter: L. C. Hsieh
>            Assignee: L. C. Hsieh
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 3.3.1, 3.4.0
>
>          Time Spent: 12h
>  Remaining Estimate: 0h
>
> In Hadoop, we use native libs for lz4 codec which has several disadvantages:
> It requires native libhadoop to be installed in system LD_LIBRARY_PATH, and they have
to be installed separately on each node of the clusters, container images, or local test environments
which adds huge complexities from deployment point of view. In some environments, it requires
compiling the natives from sources which is non-trivial. Also, this approach is platform dependent;
the binary may not work in different platform, so it requires recompilation.
> It requires extra configuration of java.library.path to load the natives, and it results
higher application deployment and maintenance cost for users.
> Projects such as Spark use [lz4-java|https://github.com/lz4/lz4-java] which is JNI-based
implementation. It contains native binaries in jar file, and it can automatically load the
native binaries into JVM from jar without any setup. If a native implementation can not be
found for a platform, it can fallback to pure-java implementation of lz4.



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