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https://issues.apache.org/jira/browse/HIVE-718?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12745548#action_12745548
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Prasad Chakka commented on HIVE-718:
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'overwrite' path has less of an issue in the sense that only one of two
competing statements will win out. the resulting directory will not contain
some files from first statement and some from the second statement. (this
assuming probability of two statements creating same random tmp directory is
very less)
my concern in this case is that, it is possible to corrupt the existing
partition with only a part of new files and overwrite some of the old files and
user has no way of knowing that such a thing has happened and it may not
possible to recover the data.
but if you guys think the current patch is no worse than the existing solution,
i do not have a problem.
> Load data inpath into a new partition without overwrite does not move the file
> ------------------------------------------------------------------------------
>
> Key: HIVE-718
> URL: https://issues.apache.org/jira/browse/HIVE-718
> Project: Hadoop Hive
> Issue Type: Bug
> Affects Versions: 0.4.0
> Reporter: Zheng Shao
> Attachments: HIVE-718.1.patch, HIVE-718.2.patch, hive-718.txt
>
>
> The bug can be reproduced as following. Note that it only happens for
> partitioned tables. The select after the first load returns nothing, while
> the second returns the data correctly.
> insert.txt in the current local directory contains 3 lines: "a", "b" and "c".
> {code}
> > create table tmp_insert_test (value string) stored as textfile;
> > load data local inpath 'insert.txt' into table tmp_insert_test;
> > select * from tmp_insert_test;
> a
> b
> c
> > create table tmp_insert_test_p ( value string) partitioned by (ds string)
> > stored as textfile;
> > load data local inpath 'insert.txt' into table tmp_insert_test_p partition
> > (ds = '2009-08-01');
> > select * from tmp_insert_test_p where ds= '2009-08-01';
> > load data local inpath 'insert.txt' into table tmp_insert_test_p partition
> > (ds = '2009-08-01');
> > select * from tmp_insert_test_p where ds= '2009-08-01';
> a 2009-08-01
> b 2009-08-01
> d 2009-08-01
> {code}
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