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From "John Russell (Code Review)" <>
Subject [Impala-ASF-CR] Release note updates for Impala 2.8
Date Fri, 27 Jan 2017 23:19:57 GMT
John Russell has posted comments on this change.

Change subject: Release note updates for Impala 2.8

Patch Set 5:


Annotated with suggestions from Mostafa.
File docs/topics/impala_new_features.xml:

PS5, Line 59: <!-- To do: Get together with Mostafa to enumerate other performance-related
improvements. -->
Talked with Mostafa. Subsequent comments from me are based on our chat.

PS5, Line 65: <p rev="IMPALA-4572">
            :                 The <codeph>COMPUTE STATS</codeph> statement can
            :                 take advantage of multithreading.
            :               </p>
Fold this item into the longer one below on the MT_DOP option.

PS5, Line 79: native code generation
Group all the codegen-related items together. (Except the filtering one, which combines codegen
+ other improvements.)

PS5, Line 95: large number
            :                 of columns
Especially if the table has TIMESTAMP columns.

PS5, Line 112: A new hint, <codeph>SORTBY
Why does the Fix Version field of IMPALA-4163 say Impala 2.9 not 2.8? Verify this hint is
supposed to be included and documented.

PS5, Line 120: new configuration setting
Explain how to use this (requires safety valve).

I'll defer that suggestion until a subsequent doc review. Probably will involve touching impala_scalability.xml.

PS5, Line 121: network overhead
The improvement is mainly reduced load on the catalog server.

PS5, Line 140: </li>
Mention IMPALA-4302 i.e. better IN list scalability.

PS5, Line 141: <li>
Mention IMPALA-1286 i.e. extracting common conjuncts from disjunctions.

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Gerrit-MessageType: comment
Gerrit-Change-Id: I7c47f422e509cec6d3eb8aaa82294b584f393aed
Gerrit-PatchSet: 5
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: John Russell <>
Gerrit-Reviewer: Alex Behm <>
Gerrit-Reviewer: Ambreen Kazi <>
Gerrit-Reviewer: Dan Hecht <>
Gerrit-Reviewer: Dimitris Tsirogiannis <>
Gerrit-Reviewer: Greg Rahn <>
Gerrit-Reviewer: Henry Robinson <>
Gerrit-Reviewer: Jim Apple <>
Gerrit-Reviewer: John Russell <>
Gerrit-Reviewer: Laurel Hale <>
Gerrit-Reviewer: Matthew Jacobs <>
Gerrit-HasComments: Yes

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