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https://issues.apache.org/jira/browse/HDFS-8827?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14654509#comment-14654509
]
Zhe Zhang commented on HDFS-8827:
---------------------------------
Thanks for adding the test [~tfukudom]. I ran the test and it didn't give NPE.
Instead, it reported an assertion error at the end:
{code}
java.lang.AssertionError:
Expected :8
Actual :9
<Click to see difference>
at org.junit.Assert.fail(Assert.java:88)
at org.junit.Assert.failNotEquals(Assert.java:743)
at org.junit.Assert.assertEquals(Assert.java:118)
at org.junit.Assert.assertEquals(Assert.java:555)
at org.junit.Assert.assertEquals(Assert.java:542)
at
org.apache.hadoop.hdfs.DFSTestUtil.verifyLocatedStripedBlocks(DFSTestUtil.java:1983)
at
org.apache.hadoop.hdfs.server.namenode.TestAddOverReplicatedStripedBlocks.testProcessOverReplicatedSBSmallerThanFullBlocks(TestAddOverReplicatedStripedBlocks.java:156)
{code}
> Erasure Coding: When namenode processes over replicated striped block, NPE
> will be occur in ReplicationMonitor
> --------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-8827
> URL: https://issues.apache.org/jira/browse/HDFS-8827
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Takuya Fukudome
> Assignee: Takuya Fukudome
> Attachments: HDFS-8827.1.patch, processing-over-replica-npe.log
>
>
> In our test cluster, when namenode processed over replicated striped blocks,
> null pointer exception(NPE) occurred. This happened under below situation: 1)
> some datanodes shutdown. 2) namenode recovers block group which lost internal
> blocks. 3) restart the stopped datanodes. 4) namenode processes over
> replicated striped blocks. 5) NPE occurs
> I think BlockPlacementPolicyDefault#chooseReplicaToDelete will return null in
> this situation which causes this NPE problem.
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