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https://issues.apache.org/jira/browse/IMPALA-7088?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joe McDonnell resolved IMPALA-7088.
-----------------------------------
Resolution: Fixed
Fix Version/s: Impala 3.1.0
Impala 2.13.0
> Parallel data load breaks load-data.py if loading data on a real cluster
> ------------------------------------------------------------------------
>
> Key: IMPALA-7088
> URL: https://issues.apache.org/jira/browse/IMPALA-7088
> Project: IMPALA
> Issue Type: Bug
> Components: Infrastructure
> Affects Versions: Impala 3.0
> Reporter: David Knupp
> Assignee: Joe McDonnell
> Priority: Blocker
> Fix For: Impala 2.13.0, Impala 3.1.0
>
>
> {{Impala/bin/load-data.py}} is most commonly used to load test data onto a
> simulated standalone cluster running on the local host. However, with the
> correct inputs, it can also be used to load data onto an actual cluster
> running on remote hosts.
> A recent enhancement in the load-data.py script to parallelize parts of the
> data loading process -- https://github.com/apache/impala/commit/d481cd48 --
> has introduced a regression in the latter use case:
> From {{$IMPALA_HOME/logs/data_loading/data-load-functional-exhaustive.log}}:
> {noformat}
> Created table functional_hbase.widetable_1000_cols
> Took 0.7121 seconds
> 09:48:01 Beginning execution of hive SQL:
> /home/systest/Impala-auxiliary-tests/tests/cdh_cluster/../../../Impala-cdh-cluster-test-runner/logs/data_loading/sql/functional/load-functional-query-exhaustive-hive-generated-text-none-none.sql
> Traceback (most recent call last):
> File
> "/home/systest/Impala-auxiliary-tests/tests/cdh_cluster/../../../Impala-cdh-cluster-test-runner/bin/load-data.py",
> line 494, in <module>
> if __name__ == "__main__": main()
> File
> "/home/systest/Impala-auxiliary-tests/tests/cdh_cluster/../../../Impala-cdh-cluster-test-runner/bin/load-data.py",
> line 468, in main
> hive_exec_query_files_parallel(thread_pool, hive_load_text_files)
> File
> "/home/systest/Impala-auxiliary-tests/tests/cdh_cluster/../../../Impala-cdh-cluster-test-runner/bin/load-data.py",
> line 299, in hive_exec_query_files_parallel
> exec_query_files_parallel(thread_pool, query_files, 'hive')
> File
> "/home/systest/Impala-auxiliary-tests/tests/cdh_cluster/../../../Impala-cdh-cluster-test-runner/bin/load-data.py",
> line 290, in exec_query_files_parallel
> for result in thread_pool.imap_unordered(execution_function, query_files):
> File "/usr/lib/python2.7/multiprocessing/pool.py", line 659, in next
> raise value
> TypeError: coercing to Unicode: need string or buffer, NoneType found
> {noformat}
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