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From "Chance Li (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-19389) Limit concurrency of put with dense (hundreds) columns to prevent write hander exhausted
Date Sun, 03 Dec 2017 19:53:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-19389?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16276058#comment-16276058
] 

Chance Li commented on HBASE-19389:
-----------------------------------

The result is not as good as 1.x with patch(But it's still worked) , and the main reason is
the modification of HBASE-18962. I need think more. So I changed patch to POC (patch is simple),
There may be better suggestions for better rs self-protection .

> 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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