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From "Yu Li (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-19389) Limit concurrency of put with dense (hundreds) columns to prevent write hander exhausted
Date Mon, 04 Dec 2017 07:02:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-19389?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16276374#comment-16276374
] 

Yu Li commented on HBASE-19389:
-------------------------------

What's the number for master branch before/after patch here? Please feel free to open new
JIRA and mark as related with this one if we find any more work to do after HBASE-18962 [~chancelq]

And I think it's ok to upload the patch to review board and start review (smile).

> Limit concurrency of put with dense (hundreds) columns to prevent write hander exhausted
> ----------------------------------------------------------------------------------------
>
>                 Key: HBASE-19389
>                 URL: https://issues.apache.org/jira/browse/HBASE-19389
>             Project: HBase
>          Issue Type: Improvement
>          Components: Performance
>    Affects Versions: 2.0.0
>         Environment: 2000+ Region Servers
> PCI-E ssd
>            Reporter: Chance Li
>            Assignee: Chance Li
>             Fix For: 2.0.0, 3.0.0
>
>         Attachments: CSLM-concurrent-write.png, HBASE-19389-branch-2.patch.POC, metrics-1.png,
ycsb-result.png
>
>
> In a large cluster, with a large number of clients, we found the RS's handlers are all
busy sometimes. And after investigation we found the root cause is about CSLM, such as compare
function heavy load. We reviewed the related WALs, and found that there were many columns
(more than 1000 columns) were writing at that time.



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