Shixiong Zhu created SPARK-6468:
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Summary: Fix the race condition of subDirs in DiskBlockManager
Key: SPARK-6468
URL: https://issues.apache.org/jira/browse/SPARK-6468
Project: Spark
Issue Type: Bug
Components: Block Manager
Affects Versions: 1.3.0
Reporter: Shixiong Zhu
Priority: Minor
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).
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