Adar Dembo has posted comments on this change. ( 
http://gerrit.cloudera.org:8080/14849 )

Change subject: KUDU-2992: Avoid sending duplicated requests in catalog_manager
......................................................................


Patch Set 1:

(4 comments)

I'm a little nervous about using the description as a unique key. They look 
immutable and unique, but they're also just supposed to be descriptive.

Could you add a test showing that this works the way you expect?

http://gerrit.cloudera.org:8080/#/c/14849/1/src/kudu/master/catalog_manager.cc
File src/kudu/master/catalog_manager.cc:

http://gerrit.cloudera.org:8080/#/c/14849/1/src/kudu/master/catalog_manager.cc@3507
PS1, Line 3507:           MarkComplete();
Will a new deletion task be created the next time the tserver heartbeats? Or 
will that tablet be missing from the tablet report?


http://gerrit.cloudera.org:8080/#/c/14849/1/src/kudu/master/catalog_manager.cc@4314
PS1, Line 4314:       // This is a floating task (since the table does not 
exist) created in
              :       // response to a tablet report.
              :       rpc->AddRef();
Do we even have these anymore? I don't think we do. Could simplify this code a 
bit.


http://gerrit.cloudera.org:8080/#/c/14849/1/src/kudu/master/catalog_manager.cc@5529
PS1, Line 5529:       LOG(WARNING) << "Do not send duplicated request: " + 
task->description();
Seems like this will be noisy. Throttle or VLOG?


http://gerrit.cloudera.org:8080/#/c/14849/1/src/kudu/master/catalog_manager.cc@5533
PS1, Line 5533:     pending_tasks_.emplace(task->description(), task);
Didn't we just do this on L5528?



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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: comment
Gerrit-Change-Id: If090723821bd78e14a3c54a35cb5e471320002e9
Gerrit-Change-Number: 14849
Gerrit-PatchSet: 1
Gerrit-Owner: Yifan Zhang <[email protected]>
Gerrit-Reviewer: Adar Dembo <[email protected]>
Gerrit-Reviewer: Kudu Jenkins (120)
Gerrit-Comment-Date: Thu, 05 Dec 2019 21:12:45 +0000
Gerrit-HasComments: Yes

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