Kihwal Lee created HDFS-4186:
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Summary: logSync() is called with the write lock held while
releasing lease
Key: HDFS-4186
URL: https://issues.apache.org/jira/browse/HDFS-4186
Project: Hadoop HDFS
Issue Type: Bug
Components: name-node
Affects Versions: 2.0.2-alpha, 0.23.4
Reporter: Kihwal Lee
Priority: Critical
As pointed out in HDFS-4138, when the lease monitor calls
internalReleaseLease(), it acquires the namespace write lock. Inside
internalReleaseLease(), if a block recovery is needed, the lease is reassigned
to the namenode itself and this is logged & synced in logReassignLease().
Since this is done while the write lock is held, log syncing is blocked. When a
large number of leases are expired and blocks are recovered, namenode can slow
down.
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