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From "Huafeng Wang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-11816) Initializing custom Metrics implementation failed in Mapper or Reducer
Date Mon, 25 Aug 2014 07:21:58 GMT

     [ https://issues.apache.org/jira/browse/HBASE-11816?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Huafeng Wang updated HBASE-11816:
---------------------------------

    Status: Patch Available  (was: Open)

> 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
>         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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