Todd Lipcon created HDFS-4621:
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Summary: additional logging to help diagnose slow QJM logSync
Key: HDFS-4621
URL: https://issues.apache.org/jira/browse/HDFS-4621
Project: Hadoop HDFS
Issue Type: Bug
Components: ha
Affects Versions: 2.0.3-alpha
Reporter: Todd Lipcon
Assignee: Todd Lipcon
Priority: Minor
I've been working on diagnosing an issue with a cluster which is seeing slow
logSync calls occasionally to QJM. Adding a few more pieces of logging would
help this:
- in the warning messages on the client side leading up to a timeout, include
which nodes have responded and which ones are still pending
- on the server side, when we actually call FileChannel.force, log a warning if
the sync takes longer than 1 second
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