mukund-thakur opened a new pull request, #4787:
URL: https://github.com/apache/hadoop/pull/4787
part of HADOOP-18103.
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### Description of PR
VectoredReadUtils.readInDirectBuffer should allocate a max buffer size, .e.g
4mb, then do repeated reads and copies; this ensures that you don't OOM with
many threads doing ranged requests.
### How was this patch tested?
Ran the existing tests. Also added a UT for zero byte file ranges.
### 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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