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https://issues.apache.org/jira/browse/PIG-930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12748469#action_12748469
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Pradeep Kamath commented on PIG-930:
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Not sure why jira shows part of above comment striked out - I meant the entire
text to be part of the comment.
> merge join should handle compressed bz2 sorted files
> ----------------------------------------------------
>
> 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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