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From "Chance Li (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-19389) Limit concurrency of put with dense (hundreds) columns to prevent write handler exhausted
Date Wed, 06 Dec 2017 15:16:00 GMT

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

Chance Li updated HBASE-19389:
------------------------------
    Attachment: HBASE-19389-branch-2-V3.patch

> Limit concurrency of put with dense (hundreds) columns to prevent write handler 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
>
>         Attachments: CSLM-concurrent-write.png, HBASE-19389-branch-2-V2.patch, HBASE-19389-branch-2-V3.patch,
HBASE-19389-branch-2.patch, 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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