Tim Armstrong has posted comments on this change.

Change subject: Impala-3342 Adding thread counters to measure time spent during 
plan fragment execution
......................................................................


Patch Set 2:

(4 comments)

http://gerrit.cloudera.org:8080/#/c/4633/2//COMMIT_MSG
Commit Message:

Line 14: 
What does the profile look like? Would be helpful to see what the plan fragment 
profile looks like.


http://gerrit.cloudera.org:8080/#/c/4633/2/be/src/exec/hdfs-scan-node.cc
File be/src/exec/hdfs-scan-node.cc:

PS2, Line 360: 
SCOPED_THREAD_COUNTER_MEASUREMENT(runtime_state_->plan_fragment_counters());
> Is this thread safe?
Yep, scanner_thread_counters() is also shared between scanner threads.


http://gerrit.cloudera.org:8080/#/c/4633/2/be/src/runtime/plan-fragment-executor.cc
File be/src/runtime/plan-fragment-executor.cc:

Line 213:       ADD_COUNTER(profile(), PER_HOST_PEAK_MEM_COUNTER, TUnit::BYTES);
Let's create the new counter here along with the other ones so that the setup 
happens in the same place.


http://gerrit.cloudera.org:8080/#/c/4633/2/be/src/runtime/runtime-state.h
File be/src/runtime/runtime-state.h:

Line 241:   ///Fragment thread counters
The comment isn't too helpful. Maybe:

  /// Total CPU utilization for all threads in this plan fragment.


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Gerrit-MessageType: comment
Gerrit-Change-Id: Ifa88aa6f3371fa42d11ecc122f43c7d83623c300
Gerrit-PatchSet: 2
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: anujphadke <apha...@cloudera.com>
Gerrit-Reviewer: Henry Robinson <he...@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <tarmstr...@cloudera.com>
Gerrit-Reviewer: Yonghyun Hwang
Gerrit-HasComments: Yes

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