Henry Robinson has posted comments on this change.

Change subject: IMPALA-2987: Distinguish between already-closed and never-seen 
data stream receivers
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Patch Set 5:

(1 comment)

http://gerrit.cloudera.org:8080/#/c/2305/5//COMMIT_MSG
Commit Message:

Line 34:   already_unregistered=false, and cancel).
> hmm, that seems bad then.  what do you think we should do?
I'm trying to construct a query that could have this property. It would require 
a limit that doesn't get pushed down - so an exchg hits its limit before a 
sender does. 

And this structure would have to be unioned with another subquery that ran for 
a long time. It all seems very unlikely, and potentially would have a 
workaround.

So I think we should continue with this fix, particularly in the absence of a 
better solution.


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Gerrit-MessageType: comment
Gerrit-Change-Id: Ib1734992c7199b9dd4b03afca5372022051b6fbd
Gerrit-PatchSet: 5
Gerrit-Project: Impala
Gerrit-Branch: cdh5-2.5.0_5.7.0
Gerrit-Owner: Henry Robinson <[email protected]>
Gerrit-Reviewer: Dan Hecht <[email protected]>
Gerrit-Reviewer: Henry Robinson <[email protected]>
Gerrit-Reviewer: Sailesh Mukil <[email protected]>
Gerrit-Reviewer: Skye Wanderman-Milne <[email protected]>
Gerrit-Reviewer: Tim Armstrong <[email protected]>
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