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From "Liu Shaohui (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11240) Print hdfs pipeline when hlog's sync is slow
Date Mon, 30 Jun 2014 10:40:26 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14047538#comment-14047538

Liu Shaohui commented on HBASE-11240:

[~stack] [~ndimiduk]
Could you help to review the new patch? Thanks.
It's very useful to debug the latency problem with pipeline info.

> Print hdfs pipeline when hlog's sync is slow
> --------------------------------------------
>                 Key: HBASE-11240
>                 URL: https://issues.apache.org/jira/browse/HBASE-11240
>             Project: HBase
>          Issue Type: Improvement
>          Components: wal
>            Reporter: Liu Shaohui
>            Assignee: Liu Shaohui
>             Fix For: 0.99.0
>         Attachments: HBASE-11240-trunk-v1.diff, HBASE-11240-trunk-v2.diff
> Sometimes the slow sync of hlog writer is because there is an abnormal datanode in the
pipeline. So it will be helpful to print the pipeline of slow sync to diagnose those problems.
> The ultimate solution is to join the trace of HBase and HDFS.

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