[HBASE-13369] Expose scanNext stats to region server level

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.1.0, 0.98.13, 2.0.0
• Hadoop Flags: Reviewed
• Assignee: Ted Yu
• Reporter: Ted Yu
• Created: 31/Mar/15 14:14
• Updated: 03/Jun/15 15:28
• Resolved: 31/Mar/15 22:51

Description

Regions have a scanNext_num_ops stat but there is no such stat at the regionserver level. The num_ops metrics at the RS level (exposed through JMX) are as follows:

    "SyncTime_num_ops" : 54,
    "AppendSize_num_ops" : 56,
    "AppendTime_num_ops" : 56,
    "Append_num_ops" : 0,
    "Delete_num_ops" : 0,
    "Mutate_num_ops" : 0,
    "Get_num_ops" : 0,
    "Replay_num_ops" : 0,
    "Increment_num_ops" : 0,
    "QueueCallTime_num_ops" : 53,
    "ProcessCallTime_num_ops" : 53,

We need a scanNext_num_ops, along with 95th percentile stat, at the RS level.