Dan Hecht has posted comments on this change.

Change subject: IMPALA-4037,IMPALA-4038: fix locking during query cancellation
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Patch Set 6:

(5 comments)

http://gerrit.cloudera.org:8080/#/c/4163/6/be/src/runtime/coordinator.h
File be/src/runtime/coordinator.h:

PS6, Line 246: during
what does this mean? while making RPCs? while servicing RPCs?


http://gerrit.cloudera.org:8080/#/c/4163/6/be/src/service/child-query.cc
File be/src/service/child-query.cc:

Line 220:   return child_queries_thread_.get();
what does holding the lock here prevent? (related to my question about allowed 
concurrency of Exec/Wait.


http://gerrit.cloudera.org:8080/#/c/4163/6/be/src/service/child-query.h
File be/src/service/child-query.h:

PS6, Line 161:  by joining
             :   /// 'child_queries_thread_'.
you should explain this without talking about private members.


Line 167:   Status WaitForAll(std::vector<ChildQuery*>* completed_queries);
can this be called by concurrently with ExecAsync() or is that not allowed?


PS6, Line 170: and the execution thread has exited
what does this really mean to the caller? that it can destroy the object? 
something else?


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Gerrit-MessageType: comment
Gerrit-Change-Id: Ibe3024803e03595ee69c47759b58e8443d7bd167
Gerrit-PatchSet: 6
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Tim Armstrong <tarmstr...@cloudera.com>
Gerrit-Reviewer: Alex Behm <alex.b...@cloudera.com>
Gerrit-Reviewer: Dan Hecht <dhe...@cloudera.com>
Gerrit-Reviewer: Henry Robinson <he...@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <tarmstr...@cloudera.com>
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