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From "Dmitry Chuyko (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-15033) Use java.util.zip.CRC32C for Java 9 and above
Date Sat, 06 Jan 2018 18:10:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-15033?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16314787#comment-16314787

Dmitry Chuyko commented on HADOOP-15033:

Attached HADOOP-15033.009.patch is a copy of https://patch-diff.githubusercontent.com/raw/apache/hadoop/pull/291.patch
after changes from fist review round and after rebase to latest trunk. Testing was blocked
for a long time by HADOOP-15128. Now the patch passed genericqa checks and shows same performance
improvement a before. Please review this latest version of pull request.

> Use java.util.zip.CRC32C for Java 9 and above
> ---------------------------------------------
>                 Key: HADOOP-15033
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15033
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: performance, util
>    Affects Versions: 3.0.0
>            Reporter: Dmitry Chuyko
>              Labels: Java9, common, jdk9
>         Attachments: HADOOP-15033.001.patch, HADOOP-15033.001.patch, HADOOP-15033.002.patch,
HADOOP-15033.003.patch, HADOOP-15033.003.patch, HADOOP-15033.004.patch, HADOOP-15033.005.diff,
HADOOP-15033.005.diff, HADOOP-15033.005.diff, HADOOP-15033.005.patch, HADOOP-15033.006.patch,
HADOOP-15033.007.patch, HADOOP-15033.007.patch, HADOOP-15033.008.patch, HADOOP-15033.009.patch,
HADOOP-15033.009.patch, HADOOP-15033.009.patch, HADOOP-15033.009.patch, HADOOP-15033.009.patch,
HADOOP-15033.009.patch, HADOOP-15033.009.patch
> java.util.zip.CRC32C implementation is available since Java 9.
> https://docs.oracle.com/javase/9/docs/api/java/util/zip/CRC32C.html
> Platform specific assembler intrinsics make it more effective than any pure Java implementation.
> Hadoop is compiled against Java 8 but class constructor may be accessible with method
handle on 9 to instances implementing Checksum in runtime.

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