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https://issues.apache.org/jira/browse/SPARK-21276?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen reassigned SPARK-21276:
---------------------------------

    Assignee: Takeshi Yamamuro

> Update  lz4-java to remove custom LZ4BlockInputStream
> -----------------------------------------------------
>
>                 Key: SPARK-21276
>                 URL: https://issues.apache.org/jira/browse/SPARK-21276
>             Project: Spark
>          Issue Type: Improvement
>          Components: Spark Core
>    Affects Versions: 2.1.1, 2.2.0
>            Reporter: Takeshi Yamamuro
>            Assignee: Takeshi Yamamuro
>            Priority: Trivial
>             Fix For: 2.3.0
>
>
> We currently use custom LZ4BlockInputStream to read concatenated byte stream 
> in shuffle 
> (https://github.com/apache/spark/blob/master/core/src/main/java/org/apache/spark/io/LZ4BlockInputStream.java#L38).
>  In the recent pr (https://github.com/lz4/lz4-java/pull/105), this 
> functionality is implemented even in lz4-java upstream. So, we might update 
> the lz4-java package that will be released in near future.
> Issue about the next lz4-java release
> https://github.com/lz4/lz4-java/issues/98
> Diff between the latest release and the master in lz4-java
> https://github.com/lz4/lz4-java/compare/62f7547abb0819d1ca1e669645ee1a9d26cd60b0...6480bd9e06f92471bf400c16d4d5f3fd2afa3b3d
>  * fixed NPE in XXHashFactory similarly
>  * Don't place resources in default package to support shading
>  * Fixes ByteBuffer methods failing to apply arrayOffset() for array-backed
>  * Try to load lz4-java from java.library.path, then fallback to bundled
>  * Add ppc64le binary
>  * Add s390x JNI binding
>  * Add basic LZ4 Frame v1.5.0 support
>  * enable aarch64 support for lz4-java
>  * Allow unsafeInstance() for ppc64le archiecture
>  * Add unsafeInstance support for AArch64
>  * Support 64-bit JNI build on Solaris
>  * Avoid over-allocating a buffer
>  * Allow EndMark to be incompressible for LZ4FrameInputStream.
>  * Concat byte stream



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