Todd Lipcon created HDFS-5790:
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Summary: LeaseManager.findPath is very slow when many leases need
recovery
Key: HDFS-5790
URL: https://issues.apache.org/jira/browse/HDFS-5790
Project: Hadoop HDFS
Issue Type: Bug
Components: namenode, performance
Affects Versions: 2.4.0
Reporter: Todd Lipcon
We recently saw an issue where the NN restarted while tens of thousands of
files were open. The NN then ended up spending multiple seconds for each
commitBlockSynchronization() call, spending most of its time inside
LeaseManager.findPath(). findPath currently works by looping over all files
held for a given writer, and traversing the filesystem for each one. This takes
way too long when tens of thousands of files are open by a single writer.
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