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From "John Russell (Code Review)" <>
Subject [Impala-ASF-CR] IMPALA-1654: DDL for multiple partitions
Date Wed, 18 Jan 2017 23:50:17 GMT
John Russell has posted comments on this change.

Change subject: IMPALA-1654: DDL for multiple partitions

Patch Set 3:

File docs/topics/impala_alter_table.xml:

Line 144:       For example, you might drop a group of partitions corresponding to a particular
> should we warn user about the scalability limit (multiple hms RPCs) of curr
Does the scalability bottleneck apply when the number of matching partitions is high, or just
generally when the table has a lot of partitions regardless of how many match?

Do we have any guidance to offer (e.g. "don't use this idiom on tables with tens of thousands
of partitions", or "under circumstances XYZ, issue multiple ALTER TABLE statements, each for
one partition")?

Does any issue manifest itself just as a single slow DDL statement, or does the hms traffic
potentially cause other statements to wait, or other symptoms?
File docs/topics/impala_compute_stats.xml:

Line 130:       The following <codeph>COMPUTE INCREMENTAL STATS</codeph> statements
affect some but not all 
> trailing space.

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Gerrit-MessageType: comment
Gerrit-Change-Id: I2060552d5081e5f93b1b1f398414c52fa03f215b
Gerrit-PatchSet: 3
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: John Russell <>
Gerrit-Reviewer: Alex Behm <>
Gerrit-Reviewer: Amos Bird <>
Gerrit-Reviewer: John Russell <>
Gerrit-HasComments: Yes

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