Vihang Karajgaonkar created IMPALA-9140:
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Summary: Get rid of the unnecessary load submitter thread pool in
tblLoadingMgr
Key: IMPALA-9140
URL: https://issues.apache.org/jira/browse/IMPALA-9140
Project: IMPALA
Issue Type: Bug
Reporter: Vihang Karajgaonkar
This JIRA is created as a followup on the discussion on
https://gerrit.cloudera.org/#/c/14611 related to various pools used for loading
tables.
It looks like there are 2 pools of threads both of the size
{{num_metadata_loading_threads}}. One pool is used to submit the load requests
to another pool {{tblLoadingPool_}} which does the actual loading of the
tables. I think we can get rid of the pool which submits the tasks since it is
not very time-consuming operation and can be done synchronously (all it needs
to do submit the task in the queue in the front or back based on whether its a
prioritized load or background load). This will simplify the loading code and
reduce unnecessary number of threads being created by {{TblLoadingMgr}}
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