[HBASE-16561] Add metrics about read/write/scan queue length and active read/write/scan handler count

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.4.0, 2.0.0
• Fix Version/s: 1.4.0, 2.0.0
• Component/s: IPC/RPC, metrics
• Hadoop Flags: Reviewed
• Assignee: Guanghao Zhang
• Reporter: Guanghao Zhang
• Created: 05/Sep/16 14:53
• Updated: 29/Nov/16 14:14
• Resolved: 29/Nov/16 08:09

Description

Now there are only metrics about total queue length and active rpc handler count. But in the RWQueueRpcExecutor, there are different queues and handlers for read/write/scan request. I thought it is necessary to add more metrics for RWQueueRpcExecutor. When use it in production cluster, we can adjust the config of queues and handlers according to the metrics.

Review url: https://reviews.apache.org/r/54072/