Commits on Apr 18, 2013

1. mon: Paxos: increase debug levels for proposal listing …

   Signed-off-by: Joao Eduardo Luis <joao.luis@inktank.com>

   Joao Eduardo Luis committed Apr 18, 2013
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2. mon: PaxosService: fix trim criteria so to avoid constantly trimming …

   Say a service establishes it will only keep 500 versions once a given
   condition X is true.  Now say that said condition X only becomes true
   after said service committing some 800 versions.
   
   Once we decide to trim, this service would trim all 300 surplus versions
   in one go.  After that, each committed version would also trim the
   previous version.
   
   Trimming an unbounded number of versions is not a good practice
   as it will generate bigger transactions (thus a greater workload on
   leveldb) and therefore bigger messages too.
   
   Constantly trimming versions implies more frequent accesses to leveldb,
   and keeping around a couple more versions won't hurt us in any significant
   way, so let us put off trimming unless we go over a predefined minimum.
   
   This patch adds two new options:
   
    paxos service trim min - minimum amount of versions to trigger a trim
                             (default: 30, 0 disables it)
    paxos service trim max - maximum amount of versions to trim during a
                             single proposal
                             (default: 50, 0 disables it)
   
   Signed-off-by: Joao Eduardo Luis <joao.luis@inktank.com>

   Joao Eduardo Luis committed Apr 18, 2013
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