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Posted to notifications@asterixdb.apache.org by "Shiva Jahangiri (JIRA)" <ji...@apache.org> on 2019/05/22 22:33:00 UTC

[jira] [Created] (ASTERIXDB-2571) Memory assigned out of the budget in hash join for large objects

Shiva Jahangiri created ASTERIXDB-2571:
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             Summary: Memory assigned out of the budget in hash join for large objects
                 Key: ASTERIXDB-2571
                 URL: https://issues.apache.org/jira/browse/ASTERIXDB-2571
             Project: Apache AsterixDB
          Issue Type: Bug
          Components: *DB - AsterixDB
    Affects Versions: 0.9.4.1
            Reporter: Shiva Jahangiri


Currently in optimized hybrid hash join in case of lack of memory asterix flushes the big prob object to the disk. For flushing a big object, a variable sized frame will be created from hyracks context not join memory budget. This means we may use more than the given budget.

Possible solutions:

1) Have a way to flush the incoming frame/buffer directly to the disk.

2) Spill enough data to be able to fit the large object(less preferred as it hurts the performance).



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