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https://issues.apache.org/jira/browse/HDFS-12361?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16144600#comment-16144600
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Weiwei Yang commented on HDFS-12361:
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Thanks [~anu] for your quick response and commit :)
> Ozone: SCM failed to start when a container metadata is empty
> -------------------------------------------------------------
>
> Key: HDFS-12361
> URL: https://issues.apache.org/jira/browse/HDFS-12361
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ozone, scm
> Affects Versions: HDFS-7240
> Reporter: Weiwei Yang
> Assignee: Weiwei Yang
> Attachments: HDFS-12361-HDFS-7240.001.patch
>
>
> When I run tests to create keys via corona, sometimes it left some containers
> with empty metadata. This might also happen when SCM stopped at some point
> that metadata was not yet written. When this happens, we got following error
> and SCM could not be started
> {noformat}
> 17/08/27 20:10:57 WARN datanode.DataNode: Unexpected exception in block pool
> Block pool BP-821804790-172.16.165.133-1503887277256 (Datanode Uuid
> 7ee16a59-9604-406e-a0f8-6f44650a725b) service to
> ozone1.fyre.ibm.com/172.16.165.133:8111
> java.lang.NullPointerException
> at
> org.apache.hadoop.ozone.container.common.helpers.ContainerData.getFromProtBuf(ContainerData.java:66)
> at
> org.apache.hadoop.ozone.container.common.impl.ContainerManagerImpl.readContainerInfo(ContainerManagerImpl.java:210)
> at
> org.apache.hadoop.ozone.container.common.impl.ContainerManagerImpl.init(ContainerManagerImpl.java:158)
> at
> org.apache.hadoop.ozone.container.ozoneimpl.OzoneContainer.<init>(OzoneContainer.java:99)
> at
> org.apache.hadoop.ozone.container.common.statemachine.DatanodeStateMachine.<init>(DatanodeStateMachine.java:77)
> at
> org.apache.hadoop.hdfs.server.datanode.DataNode.bpRegistrationSucceeded(DataNode.java:1592)
> at
> org.apache.hadoop.hdfs.server.datanode.BPOfferService.registrationSucceeded(BPOfferService.java:409)
> at
> org.apache.hadoop.hdfs.server.datanode.BPServiceActor.register(BPServiceActor.java:783)
> at
> org.apache.hadoop.hdfs.server.datanode.BPServiceActor.connectToNNAndHandshake(BPServiceActor.java:286)
> at
> org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:816)
> at java.lang.Thread.run(Thread.java:745)
> {noformat}
> We should add a NPE check and mark such containers as inactive without
> failing the SCM.
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