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From "Nick Dimiduk (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-12911) Client-side metrics
Date Fri, 23 Jan 2015 19:22:35 GMT
Nick Dimiduk created HBASE-12911:

             Summary: Client-side metrics
                 Key: HBASE-12911
                 URL: https://issues.apache.org/jira/browse/HBASE-12911
             Project: HBase
          Issue Type: Brainstorming
          Components: Client, Performance, Usability
            Reporter: Nick Dimiduk

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].


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