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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16890) Analyze the performance of AsyncWAL and fix the same
Date Tue, 25 Oct 2016 04:36:58 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15604156#comment-15604156
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ramkrishna.s.vasudevan commented on HBASE-16890:
------------------------------------------------

{code}
if (NativeCrc32.isAvailable()) {
      NativeCrc32.calculateChunkedSumsByteArray(bytesPerChecksum, type.id,
          sums, sumsOffset, data, dataOffset, dataLength);
      return;
    }
{code}
I see. I thought this is a NativeCrc32 that needs to be available in my system. And I was
not sure if that was working for me. I can verify that once. But if that works then DBB is
not an issue. Thanks @Duo.

> Analyze the performance of AsyncWAL and fix the same
> ----------------------------------------------------
>
>                 Key: HBASE-16890
>                 URL: https://issues.apache.org/jira/browse/HBASE-16890
>             Project: HBase
>          Issue Type: Sub-task
>          Components: wal
>    Affects Versions: 2.0.0
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: ramkrishna.s.vasudevan
>             Fix For: 2.0.0
>
>         Attachments: contention.png, contention_defaultWAL.png
>
>
> Tests reveal that AsyncWAL under load in single node cluster performs slower than the
Default WAL. This task is to analyze and see if we could fix it.
> See some discussions in the tail of JIRA HBASE-15536.



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