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From "Chao Shi (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-10212) New rpc metric: number of active handler
Date Fri, 20 Dec 2013 06:00:13 GMT
Chao Shi created HBASE-10212:
--------------------------------

             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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