[
https://issues.apache.org/jira/browse/HBASE-12911?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14946058#comment-14946058
]
Nick Dimiduk commented on HBASE-12911:
--------------------------------------
bq. there is no unpacking that I saw...
Unpacking in that I'm reading into the PB Method and switching on the index of
the entry; it's based on the generated code so I assume it's an implementation
detail that could change in the future. See {{MetricsConnection#updateRpc}}.
bq. How does an operator use this stuff?
Let me add a release note. Right now they have to look at the JMX of the
machine running the client. After HBASE-14381 we'll be exposing the metrics
programatically. Do we want another follow-on to allow changing the reporter?
This version of yammer also ships with a {{ConsoleReporter}} that allows
reporting to System.out. What about disabling client-side metrics collection
entirely?
> 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, 1.3.0
>
> 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, 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?
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
