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From "Lijian Shen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15931) Add log for long-running tasks in AsyncProcess
Date Thu, 07 Sep 2017 06:28:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15931?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16156552#comment-16156552
] 

Lijian Shen commented on HBASE-15931:
-------------------------------------

Hi, @Yu Li, the patch has one defect on the LOG print.
          LOG.info("#" + id + ", waiting for some tasks to finish. Expected max=" + max
              + ", tasksInProgress=" + currentInProgress + " hasError=" + hasError()
              + tableName == null ? "" : ", tableName=" + tableName);

Here need add one bracket for (tableName == null ? "" : ", tableName=" + tableName), otherwise
it will print wrong result because of operator priority, current the print result is like,
no other string logged:
          ", tableName=table1"

> Add log for long-running tasks in AsyncProcess
> ----------------------------------------------
>
>                 Key: HBASE-15931
>                 URL: https://issues.apache.org/jira/browse/HBASE-15931
>             Project: HBase
>          Issue Type: Improvement
>          Components: Operability
>            Reporter: Yu Li
>            Assignee: Yu Li
>            Priority: Critical
>             Fix For: 2.0.0, 1.3.0, 1.4.0, 0.98.20, 1.1.6, 1.2.3
>
>         Attachments: HBASE-15931.patch
>
>
> Currently if there's any long-tail tasks in a multi-action request like triggered by
{{BufferedMutatorImpl#backgroundFlushCommits}}, we could see logging message like below
> {noformat}
> 2016-05-31 09:36:55,461 INFO [Thread-16] org.apache.hadoop.hbase.client.AsyncProcess:
#28, waiting for some tasks to finish. Expected max=0, tasksInProgress=1
> {noformat}
> but there's no way to know detail of this long-tail, such as which table/region it's
accessing. This JIRA aims at adding such log for easier debugging.



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