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https://issues.apache.org/jira/browse/HBASE-15742?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15269470#comment-15269470
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Hudson commented on HBASE-15742:
--------------------------------
SUCCESS: Integrated in HBase-1.2-IT #497 (See
[https://builds.apache.org/job/HBase-1.2-IT/497/])
HBASE-15742 Reduce allocation of objects in metrics (Phil Yang) (tedyu: rev
c3370fc50721cb2d0e32279aa35a706fc3715eff)
*
hbase-hadoop2-compat/src/main/java/org/apache/hadoop/hbase/metrics/MetricsInfoImpl.java
*
hbase-hadoop2-compat/src/main/java/org/apache/hadoop/metrics2/lib/MutableHistogram.java
*
hbase-hadoop2-compat/src/main/java/org/apache/hadoop/hbase/metrics/Interns.java
*
hbase-hadoop2-compat/src/main/java/org/apache/hadoop/metrics2/lib/DynamicMetricsRegistry.java
*
hbase-hadoop2-compat/src/main/java/org/apache/hadoop/hbase/regionserver/MetricsRegionServerSourceImpl.java
*
hbase-hadoop2-compat/src/main/java/org/apache/hadoop/metrics2/lib/MutableRangeHistogram.java
*
hbase-hadoop2-compat/src/main/java/org/apache/hadoop/hbase/master/MetricsMasterSourceImpl.java
*
hbase-hadoop2-compat/src/main/java/org/apache/hadoop/hbase/ipc/MetricsHBaseServerSourceImpl.java
*
hbase-hadoop2-compat/src/main/java/org/apache/hadoop/metrics2/lib/MetricMutableQuantiles.java
*
hbase-hadoop2-compat/src/main/java/org/apache/hadoop/hbase/regionserver/MetricsRegionSourceImpl.java
*
hbase-hadoop2-compat/src/main/java/org/apache/hadoop/hbase/regionserver/MetricsRegionAggregateSourceImpl.java
> Reduce allocation of objects in metrics
> ---------------------------------------
>
> Key: HBASE-15742
> URL: https://issues.apache.org/jira/browse/HBASE-15742
> Project: HBase
> Issue Type: Bug
> Affects Versions: 1.3.0, 1.2.1, 1.0.3, 1.1.4, 0.98.19
> Reporter: Phil Yang
> Assignee: Phil Yang
> Fix For: 2.0.0, 1.3.0, 1.4.0, 1.2.2, 0.98.20
>
> Attachments: HBASE-15742-0.98.v1.patch, HBASE-15742-0.98.v2.patch,
> HBASE-15742-branch-1-v1.patch, HBASE-15742-branch-1.1-v1.patch,
> HBASE-15742-branch-1.2-v1.patch, HBASE-15742-branch-1.2-v2.patch,
> HBASE-15742-v1.patch, HBASE-15742-v2.patch, HBASE-15742-v3.patch,
> HBASE-15742-v4.patch
>
>
> We use JMX and o.a.h.metrics2 to do some metrics on regions, tables, region
> servers and cluster. We use MetricsInfo to show the information of metrics,
> and we use Interns to cache MetricsInfo objects because it won't be changed.
> However, in Interns there are some static values to limit the max cached
> objects. We can only cache 2010 metrics, but we have dozens of metrics for
> one region and we have some RS-level metrics in each RS and all metrics for
> all regions will be saved in master. So each server will have thousands of
> metrics, and we can not cache most of them. When we collect metrics by JMX,
> we will create many objects which can be avoid. It increases the pressure of
> GC and JMX has some caching logic so the objects can not be removed
> immediately which increases the pressure more.
> Interns is in Hadoop project, and I think the implementation is not suitable
> for HBase. Because we can not know how many MetricsInfo we have, it depends
> on the number of regions. And we can not set it unlimited because we should
> remove the objects whose region is split, moved, or dropped. I think we can
> use Guava's cache with expireAfterAccess which is very simple and convenient.
> So we can add a new Interns class in HBase project first, and put it to
> upstream later.
> Moreover, in MutableHistogram#snapshot we create same Strings each time, we
> can create them only in the first time.
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