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https://issues.apache.org/jira/browse/HIVE-7643?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chengxiang Li updated HIVE-7643:
--------------------------------
Description:
ExecMapper contain static states, static variable "done" for example. Spark
executor may execute multi tasks concurrently, ExecMapper static state updated
by one task would influence the logic of another task, which may lead to
unpredictable result. To reproduce, execute
{code:sql}
SELECT COUNT(*) FROM TEST TABLESAMPLE(1 ROWS) s
{code},
TEST should be a table with several blocks source data.
was:ExecMapper contain static states, static variable "done" for example.
Spark executor may execute multi tasks concurrently, ExecMapper static state
updated by one task would influence the logic of another task, which may lead
to unpredictable result. To reproduce, execute "select count(*) from test
tablesample(1 rows) s", test should be a table with several blocks source data.
> ExecMapper statis states lead to unpredictable query result.[Spark Branch]
> --------------------------------------------------------------------------
>
> Key: HIVE-7643
> URL: https://issues.apache.org/jira/browse/HIVE-7643
> Project: Hive
> Issue Type: Bug
> Components: Spark
> Reporter: Chengxiang Li
> Assignee: Chengxiang Li
>
> ExecMapper contain static states, static variable "done" for example. Spark
> executor may execute multi tasks concurrently, ExecMapper static state
> updated by one task would influence the logic of another task, which may lead
> to unpredictable result. To reproduce, execute
> {code:sql}
> SELECT COUNT(*) FROM TEST TABLESAMPLE(1 ROWS) s
> {code},
> TEST should be a table with several blocks source data.
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