Automatic log sync shouldn't happen inside logEdit path
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Key: HDFS-3025
URL: https://issues.apache.org/jira/browse/HDFS-3025
Project: Hadoop HDFS
Issue Type: Improvement
Components: name-node, performance
Affects Versions: 0.23.3
Reporter: Todd Lipcon
Assignee: Todd Lipcon
HDFS-3020 fixes the "automatic log sync" functionality so that, when logEdits
is called without log sync, it eventually triggers a sync. That sync ends up
being inline, though, which means the FSN lock is usually held during it. This
causes a bunch of threads to pile up.
Instead, we should have it just set a "syncNeeded" flag and trigger a sync from
another thread which isn't holding the lock (or from the same thread using a
"logSyncIfNeeded" call).
(credit to the FB branch for this idea)
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