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