0c88ce5416
There are two race conditions of `subDirs` in `DiskBlockManager`: 1. `getAllFiles` does not use correct locks to read the contents in `subDirs`. Although it's designed for testing, it's still worth to add correct locks to eliminate the race condition. 2. The double-check has a race condition in `getFile(filename: String)`. If a thread finds `subDirs(dirId)(subDirId)` is not null out of the `synchronized` block, it may not be able to see the correct content of the File instance pointed by `subDirs(dirId)(subDirId)` according to the Java memory model (there is no volatile variable here). This PR fixed the above race conditions. Author: zsxwing <zsxwing@gmail.com> Closes #5136 from zsxwing/SPARK-6468 and squashes the following commits: cbb872b [zsxwing] Fix the race condition of subDirs in DiskBlockManager |
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