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From "Yu Li (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-15931) Add log for long-running tasks in AsyncProcess
Date Wed, 01 Jun 2016 11:45:59 GMT

     [ https://issues.apache.org/jira/browse/HBASE-15931?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Yu Li updated HBASE-15931:
    Attachment: HBASE-15931.patch

Here's the initial patch.

Introduce two thresholds for the detailed logging: {{hbase.client.threshold.log.details}}
default to 10 which means to start logging regionservers processing the in-progress tasks
when 10 or less task left, and hard-coded {{THRESHOLD_TO_LOG_REGION_DETAILS}} which means
to start logging regions holding requests when there're only 2 or less tasks left.

Also add back logging for table name so we could more easily locate the regionserver processing
the long-tail request.

> 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
>            Reporter: Yu Li
>            Assignee: Yu Li
>         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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