merge join should handle compressed bz2 sorted files
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Key: PIG-930
URL: https://issues.apache.org/jira/browse/PIG-930
Project: Pig
Issue Type: Bug
Reporter: Pradeep Kamath
There are two issues - POLoad which is used to read the right side input does
not handle bz2 files right now. This needs to be fixed.
Further inn the index map job we bindTo(startOfBlockOffSet) (this will
internally discard first tuple if offset > 0). Then we do the following:
{noformat}
While(tuple survives pipeline) {
Pos = getPosition()
getNext()
run the tuple through pipeline in the right side which could have filter
}
Emit(key, pos, filename).
{noformat}
Then in the map job which does the join, we bindTo(pos > 0 ? pos 1 : pos) (we
do pos -1 because bindTo will discard first tuple for pos> 0). Then we do
getNext()
Now in bz2 compressed files, getPosition() returns a position which is not
really accurate. The problem is it could be a position in the middle of a
compressed bz2 block. Then when we use that position to bindTo() in the final
map job, the code would first hunt for a bz2 block header thus skipping the
whole current bz2 block.
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