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From NicoK <...@git.apache.org>
Subject [GitHub] flink pull request #4146: [FLINK-6008][blob] collection of BlobServer improv...
Date Wed, 28 Jun 2017 16:09:36 GMT
Github user NicoK commented on a diff in the pull request:

    --- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/blob/BlobUtils.java ---
    @@ -227,7 +227,7 @@ static File getStorageLocation(File storageDir, JobID jobID, String
key) {
     	private static File getJobDirectory(File storageDir, JobID jobID) {
     		final File jobDirectory = new File(storageDir, JOB_DIR_PREFIX + jobID.toString());
    -		if (!jobDirectory.exists() && !jobDirectory.mkdirs()) {
    --- End diff --
    the new way is thread-safe - imagine a directory being concurrently created after another
thread has failed the `exists()` part - not sure we actually fix a bug nowadays since the
use may be guarded...so this is probably more of a "just-in-case" thing or if usage patterns

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