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From "Lei Chen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-14082) Add replica id to JMX metrics names
Date Wed, 15 Jul 2015 01:34:04 GMT
Lei Chen created HBASE-14082:
--------------------------------

             Summary: Add replica id to JMX metrics names
                 Key: HBASE-14082
                 URL: https://issues.apache.org/jira/browse/HBASE-14082
             Project: HBase
          Issue Type: Improvement
          Components: metrics
            Reporter: Lei Chen
            Assignee: Lei Chen


Today, via JMX, one cannot distinguish a primary region from a replica. A possible solution
is to add replica id to JMX metrics names. The benefits may include, for example:
# Knowing the latency of a read request on a replica region means the first attempt to the
primary region has timeout.
# Write requests on replicas are due to the replication process, while the ones on primary
are from clients.
# In case of looking for hot spots of read operations, replicas should be excluded since TIMELINE
reads are sent to all replicas.

To implement, we can change the format of metrics names found at {code}Hadoop->HBase->RegionServer->Regions->Attributes{code}
from 
{code}namespace_<namespace>_table_<tablename>_region_<regionname>_metric_<metricname>{code}
to
{code}namespace_<namespace>_table_<tablename>_region_<regionname>_replicaid_<replicaid>_metric_<metricname>{code}




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