Github user dossett commented on the pull request:
https://github.com/apache/storm/pull/1044#issuecomment-198393099
@arunmahadevan Writers should never be writing to the same file.
`getBasePathForNextFile` will increment the rotation value before opening the
file. File name also includes `System.currentTimeMillis()` which should
further prevent conflict.
There's also a unit test that attempts to validate this by writing two
different schemas and confirming that two files are created:
https://github.com/dossett/storm/blob/STORM-1494/external/storm-hdfs/src/test/java/org/apache/storm/hdfs/bolt/AvroGenericRecordBoltTest.java#L156-L168
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