jihoonson opened a new pull request #8114: Fix race between canHandle() and addSegment() in StorageLocation URL: https://github.com/apache/incubator-druid/pull/8114 ### Description Historicals can use multiple threads to load segments in parallel from deep storage now (https://github.com/apache/incubator-druid/pull/7088, https://github.com/apache/incubator-druid/pull/4966). This could lead an incorrect computation of remaining space in `StorageLocation`. The current pattern to use `StorageLocation` is: ```java if (location.canHandle(segment)) { // load segment files into the location location.addSegment(segment); } ``` Even though each of `canHandle()` and `addSegment()` is synchronized, they are not atomically executed which could lead a wrong estimation of the available space. This PR fixes this problem to add a new method, `reserve()`, to `StorageLocation`. `reserve()` basically does what `canHandle()` and `addSegment()` atomically. If some error occurs after `reserve()`, the caller should call `remove(segment)` to release the reserved space. <hr> This PR has: - [x] been self-reviewed. - [x] added unit tests or modified existing tests to cover new code paths.
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