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From "Mithun Radhakrishnan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-13509) HCatalog getSplits should ignore the partition with invalid path
Date Thu, 14 Apr 2016 22:30:25 GMT

    [ https://issues.apache.org/jira/browse/HIVE-13509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15242058#comment-15242058
] 

Mithun Radhakrishnan commented on HIVE-13509:
---------------------------------------------

I knew this would be a sticking point with the Pig folks. ([~rohini], et al.) I'm afraid I
agree with their assessment as well. 

Changing the default behaviour of {{HCatLoader}} to break Pig semantics would be incorrect,
and would hide problems with missing data. We've run into failures/bugs in the {{FileOutputCommitterContainer}}
that thankfully didn't perpetuate downstream, thanks to the current behaviour.

Can we keep the default behaviour, with a client-side option to ignore missing data?

> HCatalog getSplits should ignore the partition with invalid path
> ----------------------------------------------------------------
>
>                 Key: HIVE-13509
>                 URL: https://issues.apache.org/jira/browse/HIVE-13509
>             Project: Hive
>          Issue Type: Improvement
>          Components: HCatalog
>            Reporter: Chaoyu Tang
>            Assignee: Chaoyu Tang
>         Attachments: HIVE-13509.patch
>
>
> It is quite common that there is the discrepancy between partition directory and its
HMS metadata, simply because the directory could be added/deleted externally using hdfs shell
command. Technically it should be fixed by MSCK and alter table .. add/drop command etc, but
sometimes it might not be practical especially in a multi-tenant env. This discrepancy does
not cause any problem to Hive, Hive returns no rows for a partition with an invalid (e.g.
non-existing) path, but it fails the Pig load with HCatLoader, because the HCatBaseInputFormat
getSplits throws an error when getting a split for a non-existing path. The error message
might looks like:
> {code}
> Caused by: org.apache.hadoop.mapred.InvalidInputException: Input path does not exist:
hdfs://xyz.com:8020/user/hive/warehouse/xyz/date=2016-01-01/country=BR
> 	at org.apache.hadoop.mapred.FileInputFormat.singleThreadedListStatus(FileInputFormat.java:287)
> 	at org.apache.hadoop.mapred.FileInputFormat.listStatus(FileInputFormat.java:229)
> 	at org.apache.hadoop.mapred.FileInputFormat.getSplits(FileInputFormat.java:315)
> 	at org.apache.hive.hcatalog.mapreduce.HCatBaseInputFormat.getSplits(HCatBaseInputFormat.java:162)
> 	at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigInputFormat.getSplits(PigInputFormat.java:274)
> {code}



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