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From "Prasad Chakka (JIRA)" <>
Subject [jira] Commented: (HIVE-142) Create a metastore check command
Date Tue, 06 Jan 2009 17:52:44 GMT


Prasad Chakka commented on HIVE-142:

I don't think the new patch solves the problem. Let's say there are 200 tables and while checking
for 101st table there is an exception due to some incorrect metadata. The way current code
is written, nothing will be printed out for the first 100 tables even though they they have
been checked. I think this can be done by moving the CheckResult object to be the check functions
argument rather than the result so even partial results can be printed to screen.

> Create a metastore check command
> --------------------------------
>                 Key: HIVE-142
>                 URL:
>             Project: Hadoop Hive
>          Issue Type: New Feature
>          Components: Metastore
>            Reporter: Johan Oskarsson
>            Assignee: Johan Oskarsson
>             Fix For: 0.2.0
>         Attachments: HIVE-142.patch, HIVE-142.patch, HIVE-142.patch
> We need a command to verify that the information in the metastore reflects the data that
is on hdfs. For example partitions can be deleted on hdfs but still be in the metastore.
> From Joydeep Sen Sarma, see ticket HIVE-126 for the full comment:
> for a command line interface - one might want to check the entire database or just a
table or even just one partition. other metadata checks will also be added over time (for
example - do the file types on disk agree with metadata records, bucketing information etc).
So, here's a strawman proposal for a new command:
> alter table <DB>[.TABLE [PARTITION-SPEC]] check [TYPE-LIST]
> where TYPE by default is 'all' (check for all kinds of errors), but can be specified
to a specific type. For example - in this case - we can have a type called 'partitions' (and
then over time we can add other types like 'fileformat' etc.). for v1 - we can just drop the
type-list altogether.
> the check command can produce a list of things that need to be done to fix the format
(like adding any directories not in the metastore - but in hdfs - to the metastore). actually
performing of such steps would require a user confirmation (y/n).

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