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Posted to dev@hive.apache.org by "Prasanth Jayachandran (JIRA)" <ji...@apache.org> on 2016/12/24 10:37:58 UTC

[jira] [Created] (HIVE-15508) LLAP: Find better way to track memory usage per executor

Prasanth Jayachandran created HIVE-15508:
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             Summary: LLAP: Find better way to track memory usage per executor
                 Key: HIVE-15508
                 URL: https://issues.apache.org/jira/browse/HIVE-15508
             Project: Hive
          Issue Type: Bug
          Components: llap
    Affects Versions: 2.2.0
            Reporter: Prasanth Jayachandran


Many hive operators make runtime decisions based on memory usage. For getting the memory usage, Runtime.getUsed() or MemoryMXBean methods are used. This works fine for MR or Tez but for LLAP the entire memory is shared among multiple executors and each executors can have different memory usage. HIVE-15503 assumes the memory usage is shared across all executors. If we track memory usage per executor, also memory usage by on-heap cache better decisions can be made by the operators. 



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