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From "Lei Chen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14082) Add replica id to JMX metrics names
Date Fri, 17 Jul 2015 23:13:04 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14082?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14632087#comment-14632087
] 

Lei Chen commented on HBASE-14082:
----------------------------------

Changing the metrics names has compatibility issue.
Can we add one metric for each region and has its replica id as the value?
For example:
{{namespace_default_table_sales_region_00254ff636363bd577b9a66de7cc4bbf_metric_storeCount}}
{{namespace_default_table_sales_region_00254ff636363bd577b9a66de7cc4bbf_metric_storeFileCount}}
{{namespace_default_table_sales_region_00254ff636363bd577b9a66de7cc4bbf_metric_memStoreSize}}
{{{color:red}namespace_default_table_sales_region_00254ff636363bd577b9a66de7cc4bbf_metric_replicaid{color}}}


> 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
>         Attachments: HBASE-14082-v1.patch
>
>
> 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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