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From "Kitti Nanasi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-13926) ThreadLocal aggregations for FileSystem.Statistics are incorrect with striped reads
Date Mon, 01 Oct 2018 23:02:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-13926?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16634745#comment-16634745
] 

Kitti Nanasi commented on HDFS-13926:
-------------------------------------

Thanks for reporting this and for providing the patch, [~xiaochen]!

The patch looks good to me, the new test fails without the patch and passes with it and the
precommit test failures do not seem related.

However there are some checkstyle warnings which should be fixed.

> ThreadLocal aggregations for FileSystem.Statistics are incorrect with striped reads
> -----------------------------------------------------------------------------------
>
>                 Key: HDFS-13926
>                 URL: https://issues.apache.org/jira/browse/HDFS-13926
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: erasure-coding
>    Affects Versions: 3.0.0
>            Reporter: Xiao Chen
>            Assignee: Xiao Chen
>            Priority: Major
>         Attachments: HDFS-13926.01.patch, HDFS-13926.prelim.patch
>
>
> During some integration testing, [~nsheth] found out that per-thread read stats for EC
is incorrect. This is due to the striped reads are done asynchronously on the worker threads.



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