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From: "ramkrishna.s.vasudevan (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] [Commented] (HBASE-11816) Initializing custom Metrics
 implementation failed in Mapper or Reducer
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    [ https://issues.apache.org/jira/browse/HBASE-11816?page=3Dcom.atlassia=
n.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=3D141=
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ramkrishna.s.vasudevan commented on HBASE-11816:
------------------------------------------------

Patch looks good to me.

> 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
>         Attachments: hbase-11816.patch
>
>
> When I want to initialize a custom MetricsSource implementation which ext=
ends class BaseSourceImpl in Mapper or Reducer=E2=80=99s setup stage, an ex=
ception will be thrown:
> Error: org.apache.hadoop.metrics2.MetricsException: Metrics source JvmMet=
rics already exists!
>         at org.apache.hadoop.metrics2.lib.DefaultMetricsSystem.newSourceN=
ame(DefaultMetricsSystem.java:126)
>         at org.apache.hadoop.metrics2.lib.DefaultMetricsSystem.sourceName=
(DefaultMetricsSystem.java:107)
>         at org.apache.hadoop.metrics2.impl.MetricsSystemImpl.register(Met=
ricsSystemImpl.java:217)
>         at org.apache.hadoop.metrics2.source.JvmMetrics.create(JvmMetrics=
.java:78)
>         at org.apache.hadoop.hbase.metrics.BaseSourceImpl$DefaultMetricsS=
ystemInitializer.init(BaseSourceImpl.java:51)
>         at org.apache.hadoop.hbase.metrics.BaseSourceImpl.<init>(BaseSour=
ceImpl.java:74)
>         at org.apache.hadoop.hbase.mapreduce.IdentityTableReducer.setup(I=
dentityTableReducer.java:89)
>         at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:168)
>         at org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.j=
ava: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(UserGroup=
Information.java:1548)
>         at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:162)
> The bug is similar to https://issues.apache.org/jira/browse/MAPREDUCE-397=
6



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