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From "Ashutosh Chauhan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-13223) HoS may hang for queries that run on 0 splits
Date Thu, 24 Mar 2016 20:04:25 GMT

    [ https://issues.apache.org/jira/browse/HIVE-13223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15210878#comment-15210878
] 

Ashutosh Chauhan commented on HIVE-13223:
-----------------------------------------

This patch is not ready. I think bug is in Spark itself, which is if you submit spark job
with 0 splits, spark executors just hang. This got exposed by HIVE-13040 after which we were
generating such jobs which was in turn effect of not generating splits for 0-length files.
Note, MR & Tez dont have this issue. In this patch, I tried to generate splits even for
0-length files (by not skipping them) but that breaks later at job execution time because
ORC reader is not resilient to 0-length file. 
To fix this issue we need to either figure out and fix Spark hang issue or extend Orc reader
to handle 0-length file more gracefully (those failures were exposed in last Hive QA run)

> HoS  may hang for queries that run on 0 splits 
> -----------------------------------------------
>
>                 Key: HIVE-13223
>                 URL: https://issues.apache.org/jira/browse/HIVE-13223
>             Project: Hive
>          Issue Type: Bug
>          Components: Spark
>    Affects Versions: 2.1.0
>            Reporter: Ashutosh Chauhan
>            Assignee: Ashutosh Chauhan
>         Attachments: HIVE-13223.1.patch, HIVE-13223.2.patch, HIVE-13223.patch
>
>
> Can be seen on all timed out tests after HIVE-13040 went in



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