robreeves opened a new pull request, #7425:
URL: https://github.com/apache/hadoop/pull/7425
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### Description of PR
This PR adds a new feature to commit files optimistically (assumes no
conflicting file/dir in the destination) to avoid a `FileSystem.getFileStatus`
RPC. The default behavior has not been changed. To use this feature this config
must be set `mapreduce.fileoutputcommitter.optimistic.file.commit.enabled=true`.
This is useful for cases like Spark where no destination conflict is
expected and the `FileSystem.getFileStatus` RPC is wasted time. TODO add more
details.
### How was this patch tested?
TODO add unit tests
I tested the performance of the changes using Spark writing to HDFS for
partitioned and non-partitioned datasets. TODO add more details.
### For code changes:
- [x] Does the title or this PR starts with the corresponding JIRA issue id
(e.g. 'HADOOP-17799. Your PR title ...')?
- [ ] Object storage: have the integration tests been executed and the
endpoint declared according to the connector-specific documentation?
- [ ] If adding new dependencies to the code, are these dependencies
licensed in a way that is compatible for inclusion under [ASF
2.0](http://www.apache.org/legal/resolved.html#category-a)?
- [ ] If applicable, have you updated the `LICENSE`, `LICENSE-binary`,
`NOTICE-binary` files?
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