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Posted to issues@hbase.apache.org by "Chao Shi (JIRA)" <ji...@apache.org> on 2013/12/20 07:00:13 UTC

[jira] [Created] (HBASE-10212) New rpc metric: number of active handler

Chao Shi created HBASE-10212:
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             Summary: New rpc metric: number of active handler
                 Key: HBASE-10212
                 URL: https://issues.apache.org/jira/browse/HBASE-10212
             Project: HBase
          Issue Type: Improvement
          Components: IPC/RPC
            Reporter: Chao Shi


The attached patch adds a new metric: number of active handler threads. We found this is a good metric to measure how busy of a server. If this number is too high (compared to the total number of handlers), the server has risks in getting call queue full.

We used to monitor  # reads or # writes. However we found this often produce false alerts, because a read touching HDFS will produce much high workload than a block-cached read.

The attached patch is based on our internal 0.94 branch, but I think it pretty easy to port to rebase to other branches if you think it is useful.



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