Tsz Wo (Nicholas), SZE created HDFS-5869:
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Summary: When rolling upgrade is in progress, NN should only
create checkpoint right before the upgrade marker
Key: HDFS-5869
URL: https://issues.apache.org/jira/browse/HDFS-5869
Project: Hadoop HDFS
Issue Type: Sub-task
Components: namenode
Reporter: Tsz Wo (Nicholas), SZE
Assignee: Tsz Wo (Nicholas), SZE
- When starting rolling upgrade, NN should create a checkpoint.
- If rolling upgrade is in progress, NN should reject saveNamespace rpc call.
- If NN restarts and it needs to save image, it should create a checkpoint
right before the upgrade marker.
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