[jira] [Created] (AURORA-74) Write snapshots and backups in a way that requires less memory

["Bill Farner (JIRA)" <ji...@apache.org>]

Bill Farner created AURORA-74:
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             Summary: Write snapshots and backups in a way that requires less memory
                 Key: AURORA-74
                 URL: https://issues.apache.org/jira/browse/AURORA-74
             Project: Aurora
          Issue Type: Story
          Components: Scheduler
            Reporter: Bill Farner
            Priority: Minor


Snapshots and backups currently involve passing around instances of the {{Snapshot}} struct.  These are fully-hydrated copies of the entire storage.  As a result, a scheduler process needs a constant multiplier of heap space headroom in order to perform these operations without encountering {{OutOfMemoryError}}s.  Fixing this will require the ability to 'stream' fixed-size parts of storage from {{MemStorage}} to the backing store (currently an {{org.apache.mesos.Log}}), or a file in the case of backups.  The reverse is also necessary — a snapshot must be read from a sequence of {{org.apache.mesos.Log.Entry}}s and fed into the in-memory storage.



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