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https://issues.apache.org/jira/browse/HBASE-11240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14016110#comment-14016110
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Nick Dimiduk commented on HBASE-11240:
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info-level logging makes sense here too.
> 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
>
>
> 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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