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Hudson commented on HDFS-9313: ------------------------------ FAILURE: Integrated in Hadoop-Yarn-trunk #1354 (See [https://builds.apache.org/job/Hadoop-Yarn-trunk/1354/]) HDFS-9313. Possible NullPointerException in BlockManager if no excess (mingma: rev d565480da2f646b40c3180e1ccb2935c9863dfef) * hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestReplicationPolicy.java * hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockPlacementPolicyDefault.java * hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockPlacementPolicy.java * hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt > Possible NullPointerException in BlockManager if no excess replica can be > chosen > -------------------------------------------------------------------------------- > > Key: HDFS-9313 > URL: https://issues.apache.org/jira/browse/HDFS-9313 > Project: Hadoop HDFS > Issue Type: Bug > Reporter: Ming Ma > Assignee: Ming Ma > Fix For: 2.8.0 > > Attachments: HDFS-9313-2.patch, HDFS-9313.patch > > > HDFS-8647 makes it easier to reason about various block placement scenarios. > Here is one possible case where BlockManager won't be able to find the excess > replica to delete: when storage policy changes around the same time balancer > moves the block. When this happens, it will cause NullPointerException. > {noformat} > java.lang.NullPointerException > at > org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicy.adjustSetsWithChosenReplica(BlockPlacementPolicy.java:156) > at > org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault.chooseReplicasToDelete(BlockPlacementPolicyDefault.java:978) > {noformat} > Note that it isn't found in any production clusters. Instead, it is found > from new unit tests. In addition, the issue has been there before HDFS-8647. -- This message was sent by Atlassian JIRA (v6.3.4#6332)