Todd Lipcon created HDFS-3974:
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Summary: dfsadmin -metasave throws NPE when under-replicated
blocks are recently deleted
Key: HDFS-3974
URL: https://issues.apache.org/jira/browse/HDFS-3974
Project: Hadoop HDFS
Issue Type: Bug
Components: name-node
Affects Versions: 3.0.0
Reporter: Todd Lipcon
Priority: Minor
We currently have the following race:
- Block is underreplicated, hence it's present in neededReplications
- User deletes the block - its BlockInfo.blockCollection is set to null
- Admin runs metaSave before the replication monitor runs.
This causes an NPE since block.getBlockCollection() for one of the
neededReplication blocks has become null.
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