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https://issues.apache.org/jira/browse/HIVE-5851?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13831357#comment-13831357
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Sreenath S Kamath commented on HIVE-5851:
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normal pig input output format
> Hive query taking a lot of time just to launch map-reduce jobs
> --------------------------------------------------------------
>
> Key: HIVE-5851
> URL: https://issues.apache.org/jira/browse/HIVE-5851
> Project: Hive
> Issue Type: Bug
> Reporter: Sreenath S Kamath
> Priority: Critical
>
> We are using hive for Ad-hoc querying and have a hive table which is
> partitioned on two fields (date,id).Now for each date there are around 1400
> ids so on a single day around that many partitions are added.The actual data
> is residing in s3. now the issue we are facing is suppose we do a select
> count(*) for a month from the table then it takes quite a long amount of
> time(approx : 1hrs 52 min) just to launch the map reduce job. when i ran the
> query in hive verbose mode i can see that its spending this time actually
> deciding how many number of mappers to spawn(calculating splits). Is there
> any means by which i can reduce this lag time for the launch of map-reduce
> job. this is one of the log messages that is being logged during this lag
> time 13/11/19 07:11:06 INFO mapred.FileInputFormat: Total input paths to
> process : 1 13/11/19 07:11:06 WARN httpclient.RestS3Service: Response
> '/Analyze%2F2013%2F10%2F03%2F465' - Unexpected response code 404, expected 200
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