loquisgon opened a new pull request #11903:
URL: https://github.com/apache/druid/pull/11903
Avoid materializing list of segment files (it can cause OOM/memory pressure)
as well as looping over the files.
### Description
This fixes a memory pressure/OOM bug seen in the field when the
middlemanager may get an "out of memory" error because the list of segments is
too large. Besides, looping through the segments files is inefficient and this
commit avoids that. It does not need new unit tests, the existing unit tests
cover this code already.
This PR has:
- [ X] been self-reviewed.
- [ ] using the [concurrency
checklist](https://github.com/apache/druid/blob/master/dev/code-review/concurrency.md)
(Remove this item if the PR doesn't have any relation to concurrency.)
- [ ] added documentation for new or modified features or behaviors.
- [ ] added Javadocs for most classes and all non-trivial methods. Linked
related entities via Javadoc links.
- [ ] added or updated version, license, or notice information in
[licenses.yaml](https://github.com/apache/druid/blob/master/dev/license.md)
- [ ] added comments explaining the "why" and the intent of the code
wherever would not be obvious for an unfamiliar reader.
- [ ] added unit tests or modified existing tests to cover new code paths,
ensuring the threshold for [code
coverage](https://github.com/apache/druid/blob/master/dev/code-review/code-coverage.md)
is met.
- [ ] added integration tests.
- [ ] been tested in a test Druid cluster.
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