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https://issues.apache.org/jira/browse/HDFS-10822?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15459231#comment-15459231
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Hudson commented on HDFS-10822:
-------------------------------
SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #10391 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/10391/])
HDFS-10822. Log DataNodes in the write pipeline. John Zhuge via Lei Xu (lei:
rev 5a8c5064d1a1d596b1f5c385299a86ec6ab9ad1e)
* (edit)
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DataStreamer.java
> Log DataNodes in the write pipeline
> -----------------------------------
>
> Key: HDFS-10822
> URL: https://issues.apache.org/jira/browse/HDFS-10822
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs-client
> Affects Versions: 2.6.0
> Reporter: John Zhuge
> Assignee: John Zhuge
> Priority: Trivial
> Labels: supportability
> Fix For: 2.9.0, 3.0.0-beta1
>
> Attachments: HDFS-10822.001.patch
>
>
> Trying to diagnose a slow HDFS flush, taking longer than 10 seconds, but did
> not know which DNs were involved in the write pipeline. Of course, I could
> search NN log for the list of DNs, but it might not be possible sometimes or
> convenient.
> Propose to add a DEBUG trace to DataStreamer#setPipeline to print the list of
> DNs in the pipeline.
> BTW, we do print the list of DNs during pipeline recovery.
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