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Posted to dev@hbase.apache.org by "Chance Li (JIRA)" <ji...@apache.org> on 2017/11/30 16:23:00 UTC

[jira] [Created] (HBASE-19389) RS's handlers are all busy when writing many columns (more than 1000 columns)

Chance Li created HBASE-19389:
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             Summary: 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


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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