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From "Chance Li (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-19389) RS's handlers are all busy when writing many columns (more than 1000 columns)
Date Thu, 30 Nov 2017 16:39:00 GMT

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

Chance Li updated HBASE-19389:
------------------------------
    Attachment: ycsb-result.png

> RS's handlers are all busy when writing many columns (more than 1000 columns) 
> ------------------------------------------------------------------------------
>
>                 Key: HBASE-19389
>                 URL: https://issues.apache.org/jira/browse/HBASE-19389
>             Project: HBase
>          Issue Type: Improvement
>          Components: hbase
>    Affects Versions: 2.0.0
>         Environment: 2000+ Region Servers
> PCI-E ssd
>            Reporter: Chance Li
>            Assignee: Chance Li
>            Priority: Minor
>             Fix For: 2.0.0, 3.0.0
>
>         Attachments: CSLM-concurrent-write.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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