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https://reviews.apache.org/r/65716/
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Review request for hive, Peter Vary and Adam Szita.
Bugs: HIVE-18696
https://issues.apache.org/jira/browse/HIVE-18696
Repository: hive-git
Description
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The idea behind the patch is
1) Separate the partition validation from starting the tasks which create the
partition folders.
Instead of doing the checks on the partitions and submit the tasks in one loop,
separated the validation into a different loop. So first iterate through the
partitions, validate the table/db names, and check for duplicates. Then if all
partitions were correct, in the second loop submit the tasks to create the
partition folders. This way if one of the partitions is incorrect, the
exception will be thrown in the first loop, before the tasks are submitted. So
we can be sure that no partition folder will be created if the list contains an
invalid partition.
2) Handle the exceptions which occur during the execution of the tasks
differently.
Previously if an exception occured in one task, the remaining tasks were
canceled, and the newly created partition folders were cleaned up in the
finally part. The problem was that it could happen that some tasks were still
not finished with the folder creation when cleaning up the others, so there
could have been leftover folders. After doing some testing it turned out that
this use case cannot be avoided completely when canceling the tasks.
The idea of this patch is to set a flag if an exception is thrown in one of the
tasks. This flag is visible in the tasks and if its value is true, the
partition folders won't be created. Then iterate through the remaining tasks
and wait for them to finish. The tasks which are started before the flag got
set will then finish creating the partition folders. The tasks which are
started after the flag got set, won't create the partition folders, to avoid
unnecessary work. This way it is sure that all tasks are finished, when
entering the finally part where the partition folders are cleaned up.
Diffs
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standalone-metastore/src/main/java/org/apache/hadoop/hive/metastore/HiveMetaStore.java
47de215
standalone-metastore/src/test/java/org/apache/hadoop/hive/metastore/client/TestAddPartitions.java
f483ca8
standalone-metastore/src/test/java/org/apache/hadoop/hive/metastore/client/TestAddPartitionsFromPartSpec.java
919ba78
Diff: https://reviews.apache.org/r/65716/diff/1/
Testing
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Added some new tests cases to the TestAddPartitions and
TestAddPartitionsFromPartSpec tests.
Thanks,
Marta Kuczora
