[jira] [Created] (HIVE-11566) Hybrid grace hash join should only allocate write buffer for a hash partition when first write happens

[Wei Zheng (JIRA)]

Wei Zheng created HIVE-11566:
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             Summary: Hybrid grace hash join should only allocate write buffer 
for a hash partition when first write happens
                 Key: HIVE-11566
                 URL: https://issues.apache.org/jira/browse/HIVE-11566
             Project: Hive
          Issue Type: Bug
          Components: Hive
            Reporter: Wei Zheng
            Assignee: Wei Zheng


Currently it's allocating a write buffer for a fixed number of hash partitions 
up front, which causes GC pause.

It's better to do the write buffer allocation on demand.



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