Kihwal Lee created HDFS-11945:
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Summary: Internal lease recovery may not be retried for a long time
Key: HDFS-11945
URL: https://issues.apache.org/jira/browse/HDFS-11945
Project: Hadoop HDFS
Issue Type: Bug
Components: namenode
Reporter: Kihwal Lee
Lease is assigned per client who is identified by its holder ID or client ID,
thus a renewal or an expiration of a lease affects all files being written by
the client.
When a client/writer dies without closing a file, its lease expires in one hour
(hard limit) and the namenode tries to recover the lease. As a part of the
process, the namenode takes the ownership of the lease and renews it. If the
recovery does not finish successfully, the lease will expire in one hour and
the namenode will try again to recover the lease.
However, if a file system has another lease expiring within the hour, the
recovery attempt for the lease will push forward the expiration of the lease
held by the namenode. This causes failed lease recoveries to be not retried
for a long time. We have seen it happening for days.
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