Michael Ho has posted comments on this change. ( 
http://gerrit.cloudera.org:8080/8758 )

Change subject: IMPALA-6190/6246: Add instances tab and event sequence
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Patch Set 10:

(1 comment)

http://gerrit.cloudera.org:8080/#/c/8758/10/be/src/runtime/fragment-instance-state.cc
File be/src/runtime/fragment-instance-state.cc:

http://gerrit.cloudera.org:8080/#/c/8758/10/be/src/runtime/fragment-instance-state.cc@222
PS10, Line 222:     RETURN_IF_ERROR(codegen->FinalizeModule());
> We need to undo this change, we deliberately had the the heavyweight codege
Would you mind elaborating on the point about "deliberately had the heavyweight 
codegen in Open()" ?

Now that I look at it again, I realize moving it here could block callers 
waiting for prepared_promise_ to be set to True, which includes cancellation 
requests. Lars, sorry for missing that.

That said, is there any reason why we cannot move the relatively lightweight 
codegen work in Prepare() to Open() ?



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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: comment
Gerrit-Change-Id: I626456b6afa9101eeeeffd5cda10c4096d63d7f9
Gerrit-Change-Number: 8758
Gerrit-PatchSet: 10
Gerrit-Owner: Lars Volker <[email protected]>
Gerrit-Reviewer: Dan Hecht <[email protected]>
Gerrit-Reviewer: Joe McDonnell <[email protected]>
Gerrit-Reviewer: Lars Volker <[email protected]>
Gerrit-Reviewer: Michael Ho <[email protected]>
Gerrit-Reviewer: Tim Armstrong <[email protected]>
Gerrit-Comment-Date: Wed, 03 Jan 2018 18:22:39 +0000
Gerrit-HasComments: Yes

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