[jira] [Created] (IMPALA-11995) Catalog update thread should have highest priority when waiting for table locks

["Quanlong Huang (Jira)" <ji...@apache.org>]

Quanlong Huang created IMPALA-11995:
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             Summary: Catalog update thread should have highest priority when waiting for table locks
                 Key: IMPALA-11995
                 URL: https://issues.apache.org/jira/browse/IMPALA-11995
             Project: IMPALA
          Issue Type: Bug
          Components: Catalog
            Reporter: Quanlong Huang
            Assignee: Quanlong Huang


We currently use a *fair* ReentrantReadWriteLock as the table lock. Under contention, locks favor granting access to the longest-waiting thread. This could let the catalog update thread waiting until all the operations submitted before finish. The delay of catalog updates will further block queries in CREATED state.

We should consider assigning the highest priority to the catalog update thread when waiting for table locks.



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