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https://issues.apache.org/jira/browse/HDFS-12726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16221647#comment-16221647
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Xiao Chen commented on HDFS-12726:
----------------------------------
To be specific, {{debugLoggingBuilder}} itself not {{toString}} should be fine,
since the log is done by the local var builder:
{code}
builder = debugLoggingBuilder.get();
....
if (numOfReplicas>0) {
String detail = enableDebugLogging;
if (LOG.isDebugEnabled()) {
if (badTarget && builder != null) {
detail = builder.toString();
builder.setLength(0);
} else {
detail = "";
}
}
throw new NotEnoughReplicasException(detail);
}
{code}
But when should the {{detail}} be logged should be investigated. At least for
the unit test in HDFS-12725, nothing is there. This is inconvenient to
debugging at least, since {{logNodeIsNotChosen}} is then a no-op.
> BlockPlacementPolicyDefault's debugLoggingBuilder is not logged
> ---------------------------------------------------------------
>
> Key: HDFS-12726
> URL: https://issues.apache.org/jira/browse/HDFS-12726
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: logging
> Reporter: Xiao Chen
> Labels: supportability
>
> During debugging HDFS-12725, {{BlockPlacementPolicyDefault's}} class'
> {{debugLoggingBuilder}} does a lot of {{get}} and {{append}}, but never
> {{toString}} and {{LOG.debug}}'ed.
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