[jira] [Created] (HIVE-18931) Race condition when ensuring a partition exists often causes AlreadyExistsException for the partition

["Reinier Kip (JIRA)" <ji...@apache.org>]

Reinier Kip created HIVE-18931:
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             Summary: Race condition when ensuring a partition exists often causes AlreadyExistsException for the partition
                 Key: HIVE-18931
                 URL: https://issues.apache.org/jira/browse/HIVE-18931
             Project: Hive
          Issue Type: Bug
          Components: Clients, HCatalog
    Affects Versions: 1.2.1
            Reporter: Reinier Kip


Hiya! I'm using Apache Beam's HCatalogIO to store data in Hive. As part of HCatOutputFormatWriter#commit(), partitions are registered in FileOutputCommitterContainer#registerPartitions(). Here, it checks for the existence of the partitions, and, if so needed, creates them. For parallel processes, this fails a lot of the time, because, as far as I understand, another process creates the partition in the meantime. This causes an AlreadyExistsException to be created for the partition.

Relevant logic: [https://github.com/apache/hive/blob/release-1.2.1/hcatalog/core/src/main/java/org/apache/hive/hcatalog/mapreduce/FileOutputCommitterContainer.java#L898-L920]. Logic is also present on master.

Am I missing something, and if not, is it an acceptable solution to swallow the AlreadyExistsException when adding the partitions?



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