Nong Li af90c8a133 Fix memory usage tracking. ...

Changes MemLimit to MemTracker:
- the limit is optional
- it also records a label and an optional parent
- Consume() and Release() also update the ancestors and there's also a new
  AnyLimitExceeded(), which also checks the ancestors
- the consumption counter is a HighwaterMarkCounter and can optionally be created
  as part of a profile

Each fragment instance now has a MemTracker that is part of a 3-level
hierarchy: process, query, fragment instance.

Change-Id: I5f580f4956fdf07d70bd9a6531032439aaf0fd07
Reviewed-on: http://gerrit.ent.cloudera.com:8080/339
Reviewed-by: Nong Li <nong@cloudera.com>
Tested-by: Nong Li <nong@cloudera.com>

2014-01-08 10:52:36 -08:00

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