createSymlink should not hold the fsnamesytem lock when sync its edit log to
disk
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Key: HDFS-1165
URL: https://issues.apache.org/jira/browse/HDFS-1165
Project: Hadoop HDFS
Issue Type: Bug
Components: name-node
Affects Versions: 0.21.0
Reporter: Hairong Kuang
Assignee: Eli Collins
Priority: Blocker
Fix For: 0.21.0, 0.22.0
Holding the fsnamesytem lock while calling logSync is unnecessary and decrease
NameNode performance.
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