Commits on Aug 6, 2016

1. raft: Garbage collect WAL files …

   We currently garbage collect snapshot files (keeping only
   KeepOldSnapshot outdated snapshots, which defaults to 0). However, we
   don't garbage collect the WAL files that the snapshots replace.
   
   Delete any WALs which are so old that they only contain information that
   predates the oldest of the snapshots we have retained. This means that
   by default, we will remove old WALs once they are supplanted by a
   snapshot. However, if KeepOldSnapshots is set above 0, we will keep
   whichever WALs are necessary to catch up from the oldest of the retained
   snapshots. This makes sure that the old snapshots we retain are actually
   useful, and avoids adding an independent knob for WAL retention that
   might end up with an inconsistent setting.
   
   Also, fix serious brokenness in the the deletion of old snapshots (it
   was deleting the most recent outdated snapshots, instead of the oldest).
   
   Signed-off-by: Aaron Lehmann <[email protected]>

   

   aaronlehmann committed Aug 6, 2016
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