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https://issues.apache.org/jira/browse/HADOOP-18739?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17721553#comment-17721553
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ASF GitHub Bot commented on HADOOP-18739:
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developersarm opened a new pull request, #5640:
URL: https://github.com/apache/hadoop/pull/5640
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### Description of PR
While copying a folder containing large files consisting of multiple distcp
chunks, copy committer synchronously picks chunks of each file and concatenates
them. This is very slow.
As part of this PR, we are parallelising the concatenation of distcp chunks
of separate files with a default thread pool of size 10.
### How was this patch tested?
* Existing unit tests are passing which are testing both failure and success
scenarios.
* Tested the patch on distributed cloud setup by running a distcp job for
copying a folder of size 100GB having 20 files of size 5GB from one cluster to
another. Noticed an improvement of 2 mins in latency.
### 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?
> Parallelize concatenation of distcp chunks of separate files in CopyCommitter
> -----------------------------------------------------------------------------
>
> Key: HADOOP-18739
> URL: https://issues.apache.org/jira/browse/HADOOP-18739
> Project: Hadoop Common
> Issue Type: Improvement
> Components: tools/distcp
> Reporter: Abhay Yadav
> Priority: Trivial
>
> While copying a folder containing large files consisting of multiple distcp
> chunks, copy committer synchronously picks chunks of each file and
> concatenates them. This part can be improved by parallelizing the
> concatenation of distcp chunks of separate files. We are able to save 2-3
> minutes while copying a folder of 100 GB containing 20 files of 5GB size with
> this improvement.
> Contributing a patch for this.
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