Andrew Wang created HDFS-4350:
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Summary: Make stale marking on read and write independent
Key: HDFS-4350
URL: https://issues.apache.org/jira/browse/HDFS-4350
Project: Hadoop HDFS
Issue Type: Bug
Affects Versions: 3.0.0
Reporter: Andrew Wang
Assignee: Andrew Wang
Marking of datanodes as stale for the read and write path was introduced in
HDFS-3703 and HDFS-3912 respectively. This is enabled using two new keys,
{{DFS_NAMENODE_CHECK_STALE_DATANODE_KEY}} and
{{DFS_NAMENODE_AVOID_STALE_DATANODE_FOR_WRITE_KEY}}. However, there currently
exists a dependency, since you cannot enable write marking without also
enabling read marking, since the first key enables both checking of staleness
and read marking.
I propose renaming the first key to
{{DFS_NAMENODE_AVOID_STALE_DATANODE_FOR_READ_KEY}}, and make checking enabled
if either of the keys are set. This will allow read and write marking to be
enabled independently.
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