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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2888) Review all our metrics
Date Wed, 08 Sep 2010 05:32:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2888?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12907096#action_12907096
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stack commented on HBASE-2888:
------------------------------

Setting hbase.period in hadoop-metrics.properties doesn't seem to have an effect; counts are
off.  Here's what I noticed digging in code:

'hadoop-metrics.properties' gets read up into a metrics attributes map but nothing seems to
be done w/ them subsequently. Reading up in hadoop, in branch-0.20/src/core/org/apache/hadoop/metrics/package.html,
it seems to imply that we need to getAttribute and set them after we make a metrics Context;
i.e. in this case, call setPeriod in RegionServerMetrics, etc.?

More broadly, need to make sure settings in hadoop-metrics.properties take effect when changed.

> Review all our metrics
> ----------------------
>
>                 Key: HBASE-2888
>                 URL: https://issues.apache.org/jira/browse/HBASE-2888
>             Project: HBase
>          Issue Type: Improvement
>          Components: master
>            Reporter: Jean-Daniel Cryans
>             Fix For: 0.90.0
>
>
> HBase publishes a bunch of metrics, some useful some wasteful, that should be improved
to deliver a better ops experience. Examples:
>  - Block cache hit ratio converges at some point and stops moving
>  - fsReadLatency goes down when compactions are running
>  - storefileIndexSizeMB is the exact same number once a system is serving production
load
> We could use new metrics too.

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