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Posted to issues@tez.apache.org by "Kuhu Shukla (JIRA)" <ji...@apache.org> on 2017/06/26 21:15:00 UTC
[jira] [Created] (TEZ-3776) ShuffleHandler can theoretically NPE if
all partitions in the ranged fetch are empty
Kuhu Shukla created TEZ-3776:
--------------------------------
Summary: ShuffleHandler can theoretically NPE if all partitions in the ranged fetch are empty
Key: TEZ-3776
URL: https://issues.apache.org/jira/browse/TEZ-3776
Project: Apache Tez
Issue Type: Bug
Reporter: Kuhu Shukla
{code}
if (index.getPartLength() != 0) {
if (firstIndex == null) {
firstIndex = index;
}
lastIndex = index;
}
ShuffleHeader header = new ShuffleHeader(mapId, index.getPartLength(), index.getRawLength(), reduce);
DataOutputBuffer dob = new DataOutputBuffer();
header.write(dob);
ch.write(wrappedBuffer(dob.getData(), 0, dob.getLength()));
}
final long rangeOffset = firstIndex.getStartOffset(); <<<<<<<<<<<<<<<<<
{code}
In cases where tez.runtime.empty.partitions.info-via-events.enabled is false and is respected (say post TEZ-3287, if not handled correctly at the output side, the shuffle handler assumes that if it has got to this point there is at least one non empty partition. The ShuffleHandler should protect itself from this NPE.
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