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From "Yu Li (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-18083) Make large/small file clean thread number configurable in HFileCleaner
Date Sat, 20 May 2017 14:23:04 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18083?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16018477#comment-16018477
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Yu Li commented on HBASE-18083:
-------------------------------

bq. Last time, we found tcp nagle issue with 0.98 based releases, which caused about 120 ms
delay for continuous deletes
Any JIRA opened for this one?

bq. How fast is the cleaner thread finish one run
Pretty fast in our case, and no obvious change in NN metrics after we opened 25 threads for
each (large and small file deleting)

> Make large/small file clean thread number configurable in HFileCleaner
> ----------------------------------------------------------------------
>
>                 Key: HBASE-18083
>                 URL: https://issues.apache.org/jira/browse/HBASE-18083
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Yu Li
>            Assignee: Yu Li
>
> Currently we have only one thread for both large and small file cleaning, but when write
pressure is huge we might need more cleaner threads, so we need to make the thread number
configurable.
> We observed more than 1.8PB data in archive directory online due to business access rate
change, and this proposal is one of the necessary changes required.
> Default value of the configurations would still be left to 1 to keep low pressure to
NN for normal case.



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