Vinay created HDFS-5283:
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Summary: NN not coming out of startup safemode due to under
construction blocks only inside snapshots also counted in safemode threshhold
Key: HDFS-5283
URL: https://issues.apache.org/jira/browse/HDFS-5283
Project: Hadoop HDFS
Issue Type: Bug
Components: snapshots
Affects Versions: 2.1.1-beta, 3.0.0
Reporter: Vinay
Assignee: Vinay
Priority: Blocker
This is observed in one of our env:
1. A MR Job was running which has created some temporary files and was writing
to them.
2. Snapshot was taken
3. And Job was killed and temporary files were deleted.
4. Namenode restarted.
5. After restart Namenode was in safemode waiting for blocks
Analysis
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1. Since the snapshot taken also includes the temporary files which were open,
and later original files are deleted.
2. UnderConstruction blocks count was taken from leases. not considered the UC
blocks only inside snapshots
3. So safemode threshold count was more and NN did not come out of safemode
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