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https://issues.apache.org/jira/browse/HDFS-12299?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16129004#comment-16129004
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Brahma Reddy Battula edited comment on HDFS-12299 at 8/21/17 10:16 AM:
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Uploading the test to reproduce this issue.
HDFS-9040 fixes this issue fully in {{trunk}}, So only testcase is added.
HDFS-11817 Partially (null storages were included) fixes in {{branch-2}} and
{{branch-2.8}}. Updated patch to add only {{non-null DatanodeStorageInfo}} at
BlockUnderConstructionFeature#setExpectedLocations
Kindly Review.
was (Author: brahmareddy):
Uploading the test to reproduce this issue.
HDFS-9040 fixes this issue fully in {{trunk}}, So only testcase is added.
HDFS-11817 Partially fixes in {{branch-2}} and {{branch-2.8}}. Updated patch
for full fix(null storages were included).
Kindly Review.
> Race Between update pipeline and DN Re-Registration
> ---------------------------------------------------
>
> Key: HDFS-12299
> URL: https://issues.apache.org/jira/browse/HDFS-12299
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Brahma Reddy Battula
> Assignee: Brahma Reddy Battula
> Attachments: HDFS-12299-branch-2.patch, HDFS-12299.patch
>
>
> *Scenario*
> - Started pipeline with DN1->DN2->DN3
> - DN1 is re-reg and update pipeline is called
> - Update pipeline will success with DN1->DN3->DN4
> - Again update pipeline is called,which will fail with NPE.
> In step3 updatepipeline will set the storages as null since DN1 re-reg(which
> will remove and add the storages)
> {{FSNamesystem#updatePipelineInternal}}
> {code}
> lastBlock.getUnderConstructionFeature().setExpectedLocations(lastBlock,
> storages, lastBlock.getBlockType())
> {code}
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