[jira] [Updated] (HBASE-19389) Limit concurrency of put with dense (hundreds) columns to prevent write hander exhausted

["Yu Li (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-19389?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yu Li updated HBASE-19389:
--------------------------
    Summary: Limit concurrency of put with dense (hundreds) columns to prevent write hander exhausted  (was: RS's handlers are all busy when writing many columns (more than 1000 columns) )

> 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, 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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