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From "star (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-21485) Hive desc operation takes more than 100 seconds after upgrading from Hive 1.2.1 to 2.3.4
Date Fri, 22 Mar 2019 00:49:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-21485?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16798594#comment-16798594
] 

star commented on HIVE-21485:
-----------------------------

Maybe table with so much partition is not a good practice.

> Hive desc operation takes more than 100 seconds after upgrading from Hive 1.2.1 to 2.3.4
> ----------------------------------------------------------------------------------------
>
>                 Key: HIVE-21485
>                 URL: https://issues.apache.org/jira/browse/HIVE-21485
>             Project: Hive
>          Issue Type: Bug
>          Components: CLI, Hive
>    Affects Versions: 2.3.4
>            Reporter: Qingxin Wu
>            Priority: Major
>
> Hive desc [formatted|extended] operation cost more than 100 seconds after upgrading from
Hive 1.2.1 to 2.3.4. This is mainly caused by showing stats for partitioned tables which was
introduced by HIVE-16098 when the partitioned tables have a large amount of partitions. In
our case, the number of partition is 187221.
> {code:java}
> hive> desc bus.kafka_data;
> OK
> id            	        string
> ...
> d                  	    map<string,string>
> stat_date           	string
> log_id              	string
> # Partition Information
> # col_name            	data_type           	comment
> stat_date           	string
> log_id              	string
> Time taken: 115.342 seconds, Fetched: 42 row(s)
> {code}
> same operation executed in hive-1.2.1 and only cost 2 seconds.
> {code:java}
> hive> desc bus.kafka_data;
> OK
> id            	        string
> ...
> d                  	    map<string,string>
> stat_date           	string
> log_id              	string
> # Partition Information
> # col_name            	data_type           	comment
> stat_date           	string
> log_id              	string
> Time taken: 2.037 seconds, Fetched: 42 row(s)
> {code}



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