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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-19389) Limit concurrency of put with dense (hundreds) columns to prevent write hander exhausted
Date Fri, 01 Dec 2017 12:06:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-19389?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16274311#comment-16274311
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Anoop Sam John commented on HBASE-19389:
----------------------------------------

In the solution - abt the concurrent max #columns . So this is the max number of different
columns for same CF but across rows?

> 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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