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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