steveloughran opened a new pull request, #6825:
URL: https://github.com/apache/hadoop/pull/6825
Improve task commit resilience everywhere
and add an option to reduce delete IO requests on
job cleanup (relevant for ABFS and HDFS).
Task Commit Resilience
----------------------
Task manifest saving is re-attempted on failure; the number of attempts
made is configurable with the option:
mapreduce.manifest.committer.manifest.save.attempts
* The default is 5.
* The minimum is 1; asking for less is ignored.
* A retry policy adds 500ms of sleep per attempt.
* Move from classic rename() to commitFile() to rename the file, after
calling getFileStatus() to get its length and possibly etag. This becomes a
rename() on gcs/hdfs anyway, but on abfs it does reach the
ResilientCommitByRename callbacks in abfs, which report on the outcome to the
caller...which is then logged at WARN.
* New statistic task_stage_save_summary_file to distinguish from other
saving operations (job success/report file). This is only saved to the manifest
on task commit retries, and provides statistics on all previous unsuccessful
attempts to save the manifests
+ test changes to match the codepath changes, including improvements in
fault injection.
Directory size for deletion
---------------------------
New option
mapreduce.manifest.committer.cleanup.parallel.delete.base.first
This attempts an initial attempt at deleting the base dir, only falling back
to parallel deletes if there's a timeout.
This option is disabled by default; Consider enabling it for abfs to reduce
IO load. Consult the documentation for more details.
Success file printing
---------------------
The command to print a JSON _SUCCESS file from this committer and any S3A
committer is now something which can be invoked from the mapred command:
mapred successfile <path to file>
Contributed by Steve Loughran
### How was this patch tested?
yetus's work, if happy will validate on abfs.
### For code changes:
- [ ] 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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