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https://issues.apache.org/jira/browse/HBASE-11816?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14109931#comment-14109931
]
Hudson commented on HBASE-11816:
--------------------------------
SUCCESS: Integrated in HBase-0.98-on-Hadoop-1.1 #442 (See
[https://builds.apache.org/job/HBase-0.98-on-Hadoop-1.1/442/])
HBASE-11816 Initializing custom Metrics implementation failed in Mapper or
Reducer (stack: rev 5600f0c1795fb215c1117a64cb21111d66b0da0a)
*
hbase-hadoop2-compat/src/main/java/org/apache/hadoop/hbase/metrics/BaseSourceImpl.java
> Initializing custom Metrics implementation failed in Mapper or Reducer
> ----------------------------------------------------------------------
>
> Key: HBASE-11816
> URL: https://issues.apache.org/jira/browse/HBASE-11816
> Project: HBase
> Issue Type: Bug
> Components: metrics
> Reporter: Huafeng Wang
> Priority: Minor
> Fix For: 0.99.0, 2.0.0, 0.98.6
>
> Attachments: hbase-11816.patch
>
>
> When I want to initialize a custom MetricsSource implementation which extends
> class BaseSourceImpl in Mapper or Reducer’s setup stage, an exception will be
> thrown:
> Error: org.apache.hadoop.metrics2.MetricsException: Metrics source JvmMetrics
> already exists!
> at
> org.apache.hadoop.metrics2.lib.DefaultMetricsSystem.newSourceName(DefaultMetricsSystem.java:126)
> at
> org.apache.hadoop.metrics2.lib.DefaultMetricsSystem.sourceName(DefaultMetricsSystem.java:107)
> at
> org.apache.hadoop.metrics2.impl.MetricsSystemImpl.register(MetricsSystemImpl.java:217)
> at
> org.apache.hadoop.metrics2.source.JvmMetrics.create(JvmMetrics.java:78)
> at
> org.apache.hadoop.hbase.metrics.BaseSourceImpl$DefaultMetricsSystemInitializer.init(BaseSourceImpl.java:51)
> at
> org.apache.hadoop.hbase.metrics.BaseSourceImpl.<init>(BaseSourceImpl.java:74)
> at
> org.apache.hadoop.hbase.mapreduce.IdentityTableReducer.setup(IdentityTableReducer.java:89)
> at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:168)
> at
> org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:627)
> at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:389)
> at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:167)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:415)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1548)
> at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:162)
> The bug is similar to https://issues.apache.org/jira/browse/MAPREDUCE-3976
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