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From "Alex Behm (Code Review)" <ger...@cloudera.org>
Subject [Impala-ASF-CR] Add doc for MT DOP query option.
Date Fri, 20 Jan 2017 20:07:16 GMT
Alex Behm has posted comments on this change.

Change subject: Add doc for MT_DOP query option.
......................................................................


Patch Set 1:

(1 comment)

http://gerrit.cloudera.org:8080/#/c/5652/1/docs/topics/impala_mt_dop.xml
File docs/topics/impala_mt_dop.xml:

Line 38:       <indexterm audience="hidden">MT_DOP query option</indexterm>
We should mention somewhere that COMPUTE [INCREMENTAL] STATS on Parquet tables is run with
MT_DOP=4 by default.

We should also clarify the special meaning of MT_DOP=0, this might need a brief introduction
to our multi-threading effort, i.e. that we are incrementally revamping the execution engine,
and MT_DOP=0 will revert to using the "old" execution engine.


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Gerrit-MessageType: comment
Gerrit-Change-Id: Ife2786532b425af6d230074f1c0b5c7dcb2b8a92
Gerrit-PatchSet: 1
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: John Russell <jrussell@cloudera.com>
Gerrit-Reviewer: Alex Behm <alex.behm@cloudera.com>
Gerrit-Reviewer: Mostafa Mokhtar <mmokhtar@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <tarmstrong@cloudera.com>
Gerrit-HasComments: Yes

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