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From "Sergey Shelukhin (JIRA)" <>
Subject [jira] [Created] (HIVE-10068) LLAP: adjust allocation after decompression
Date Tue, 24 Mar 2015 02:29:52 GMT
Sergey Shelukhin created HIVE-10068:

             Summary: LLAP: adjust allocation after decompression
                 Key: HIVE-10068
             Project: Hive
          Issue Type: Sub-task
            Reporter: Sergey Shelukhin

We don't know decompressed size of a compression buffer in ORC, all we know is the file-level
compression buffer size. For many files, compression buffers can be smaller than that because
of compact encoding, or because compression block ends for other reasons (different streams,
etc. - "present" streams for example are very small).
BuddyAllocator should be able to accept back parts of the allocated memory (e.g. allocate
256Kb with minimum allocation of 32Kb, decompress 45Kb, return the last 192Kb as 64+128Kb).
For generality (this depends on implementation), we can make an API like "offer", and allocator
can decide to take back however much it can.

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