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https://issues.apache.org/jira/browse/HDFS-10822?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15453244#comment-15453244
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Kihwal Lee commented on HDFS-10822:
-----------------------------------
bq. Trying to diagnose a slow HDFS flush, taking longer than 10 second...
It might not be relevant in your case, but we've seen a lot of such problems
with 2.6, which mostly disappeared after applying HDFS-8791 internally.
In any case, adding the debug log line seems reasonable.
> 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
>
> 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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