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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