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https://issues.apache.org/jira/browse/HDFS-6148?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kihwal Lee resolved HDFS-6148.
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Resolution: Duplicate
> LeaseManager crashes while initiating block recovery
> ----------------------------------------------------
>
> Key: HDFS-6148
> URL: https://issues.apache.org/jira/browse/HDFS-6148
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.3.0
> Reporter: Kihwal Lee
> Assignee: Kihwal Lee
> Priority: Blocker
>
> While running branch-2.4, the LeaseManager crashed with an NPE. This does not
> always happen on block recovery.
> {panel}
> Exception in thread
> "org.apache.hadoop.hdfs.server.namenode.LeaseManager$Monitor@5d66b728"
> java.lang.NullPointerException
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockInfoUnderConstruction$
>
> ReplicaUnderConstruction.isAlive(BlockInfoUnderConstruction.java:121)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockInfoUnderConstruction.
> initializeBlockRecovery(BlockInfoUnderConstruction.java:286)
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.internalReleaseLease(FSNamesystem.java:3746)
> at
> org.apache.hadoop.hdfs.server.namenode.LeaseManager.checkLeases(LeaseManager.java:474)
> at
> org.apache.hadoop.hdfs.server.namenode.LeaseManager.access$900(LeaseManager.java:68)
> at
> org.apache.hadoop.hdfs.server.namenode.LeaseManager$Monitor.run(LeaseManager.java:411)
> at java.lang.Thread.run(Thread.java:722)
> {panel}
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