Brahma Reddy Battula created HDFS-12299:
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Summary: 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
*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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