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. -- This message was sent by Atlassian JIRA (v6.1.4#6159)