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https://issues.apache.org/jira/browse/HBASE-10212?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lars Hofhansl updated HBASE-10212:
----------------------------------
Resolution: Fixed
Status: Resolved (was: Patch Available)
Committed to 0.94.
> 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
> Assignee: Chao Shi
> Fix For: 0.94.17
>
> Attachments: hbase-10212.patch
>
>
> 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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