[jira] [Assigned] (HIVE-20517) Creation of staging directory and Move operation is taking time in S3

["mahesh kumar behera (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-20517?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

mahesh kumar behera reassigned HIVE-20517:
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> Creation of staging directory and Move operation is taking time in S3
> ---------------------------------------------------------------------
>
>                 Key: HIVE-20517
>                 URL: https://issues.apache.org/jira/browse/HIVE-20517
>             Project: Hive
>          Issue Type: Bug
>          Components: repl
>    Affects Versions: 4.0.0
>            Reporter: mahesh kumar behera
>            Assignee: mahesh kumar behera
>            Priority: Major
>             Fix For: 4.0.0
>
>
> Operations like insert and add partition creates a staging directory to generate the files and then move the files created to actual location. In replication flow, the files are first copied to the staging directory and then moved (rename) to the actual table location. In case of S3, move is not an atomic operation. It internally does a copy and delete. So it can not guarantee the consistency required. So it is better to copy the files directly to the actual location. This will help in avoiding the staging directory creation (which takes 1-2 seconds in s3) and move (which takes time proportional to file size).



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