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https://issues.apache.org/jira/browse/HBASE-12911?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14949226#comment-14949226
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stack commented on HBASE-12911:
-------------------------------
Can it be on by default in 1.3 and 2.0? [~ndimiduk]
> Client-side metrics
> -------------------
>
> Key: HBASE-12911
> URL: https://issues.apache.org/jira/browse/HBASE-12911
> Project: HBase
> Issue Type: New Feature
> Components: Client, Operability, Performance
> Reporter: Nick Dimiduk
> Assignee: Nick Dimiduk
> Fix For: 2.0.0, 1.2.0, 1.3.0
>
> Attachments: 0001-HBASE-12911-Client-side-metrics.patch,
> 0001-HBASE-12911-Client-side-metrics.patch,
> 0001-HBASE-12911-Client-side-metrics.patch,
> 0001-HBASE-12911-Client-side-metrics.patch,
> 0001-HBASE-12911-Client-side-metrics.patch,
> 0001-HBASE-12911-Client-side-metrics.patch,
> 0001-HBASE-12911-Client-side-metrics.patch,
> 0001-HBASE-12911-Client-side-metrics.patch,
> 0001-HBASE-12911-Client-side-metrics.patch,
> 0001-HBASE-12911-Client-side-metrics.patch,
> 0001-HBASE-12911-Client-side-metrics.patch, 12911-0.98.00.patch,
> 12911-branch-1.00.patch, 12911.yammer.jpg, 12911.yammer.v00.patch,
> 12911.yammer.v01.patch, 12911.yammer.v02.patch, 12911.yammer.v02.patch,
> 12911.yammer.v03.branch-1.patch, 12911.yammer.v03.patch,
> 12911.yammer.v03.patch, 12911.yammer.v04.0.98.patch,
> 12911.yammer.v04.branch-1.2.patch, 12911.yammer.v04.branch-1.2.patch,
> 12911.yammer.v04.branch-1.patch, 12911.yammer.v04.branch-1.patch,
> 12911.yammer.v04.patch, 12911.yammer.v04.patch, am.jpg, client metrics
> RS-Master.jpg, client metrics client.jpg, conn_agg.jpg, connection
> attributes.jpg, ltt.jpg, standalone.jpg
>
>
> There's very little visibility into the hbase client. Folks who care to add
> some kind of metrics collection end up wrapping Table method invocations with
> {{System.currentTimeMillis()}}. For a crude example of this, have a look at
> what I did in {{PerformanceEvaluation}} for exposing requests latencies up to
> {{IntegrationTestRegionReplicaPerf}}. The client is quite complex, there's a
> lot going on under the hood that is impossible to see right now without a
> profiler. Being a crucial part of the performance of this distributed system,
> we should have deeper visibility into the client's function.
> I'm not sure that wiring into the hadoop metrics system is the right choice
> because the client is often embedded as a library in a user's application. We
> should have integration with our metrics tools so that, i.e., a client
> embedded in a coprocessor can report metrics through the usual RS channels,
> or a client used in a MR job can do the same.
> I would propose an interface-based system with pluggable implementations. Out
> of the box we'd include a hadoop-metrics implementation and one other,
> possibly [dropwizard/metrics|https://github.com/dropwizard/metrics].
> Thoughts?
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