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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10010) eliminate the put latency spike on the new log file beginning
Date Mon, 25 Nov 2013 17:26:37 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10010?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13831647#comment-13831647
] 

Ted Yu commented on HBASE-10010:
--------------------------------

Looking at src/core/org/apache/hadoop/io/SequenceFile.java under branch-1, I don't see the
flush call:
{code}
    /** Write and flush the file header. */
    void writeFileHeader()
      throws IOException {
      Text.writeString(out, keyClass.getName());
      Text.writeString(out, valClass.getName());

      out.writeBoolean(this.isCompressed());
      out.writeBoolean(this.isBlockCompressed());

      if (this.isCompressed()) {
        Text.writeString(out, (codec.getClass()).getName());
      }
      this.metadata.write(out);
    }
{code}

> eliminate the put latency spike on the new log file beginning
> -------------------------------------------------------------
>
>                 Key: HBASE-10010
>                 URL: https://issues.apache.org/jira/browse/HBASE-10010
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver
>    Affects Versions: 0.94.13
>            Reporter: Liang Xie
>            Assignee: Liang Xie
>         Attachments: HBase-10010-0.94-v2.txt, HBase-10010-0.94-v3.txt, HBase-10010-0.94.txt,
HBase-10010-trunk-v2.txt, HBase-10010-trunk.txt
>
>
> In deed, the original finding came from fb, see HBASE-6813 for detailed discussion.
> Through this improvement doesn't expect obvious gain on 95th or 99th latency, it still
could make the response time more stable to me.



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