Chris Nauroth created HDFS-4996:
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Summary: ClientProtocol#metaSave can be made idempotent by
overwriting the output file instead of appending to it
Key: HDFS-4996
URL: https://issues.apache.org/jira/browse/HDFS-4996
Project: Hadoop HDFS
Issue Type: Improvement
Components: namenode
Affects Versions: 3.0.0, 2.1.0-beta
Reporter: Chris Nauroth
Assignee: Chris Nauroth
Priority: Minor
{{ClientProtocol#metaSave}} opens its output file for append. This prevents
the operation from being idempotent, because retries can cause unpredictable
side effects (single copy of the output vs. multiple copies). As discussed on
HDFS-4974, the operation could be made idempotent by changing this to open the
file for overwrite instead of append.
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