anchor.diff:  #
   # the other option is "periodic" where writes may be acked immediately
   # and the CommitLog is simply synced every commitlog_sync_period_in_ms
  -# milliseconds.
  +# milliseconds.  By default this allows 1024*(CPU cores) pending
  +# entries on the commitlog queue.  If you are writing very large blobs,
  +# you should reduce that; 16*cores works reasonably well for 1MB blobs.
  +# It should be at least as large as the concurrent_writes setting.
   commitlog_sync: periodic
   commitlog_sync_period_in_ms: 10000
  +# commitlog_periodic_queue_size:
  +
  +# The size of the individual commitlog file segments.  A commitlog
  +# segment may be archived, deleted, or recycled once all the data
  +# in it (potentially from each columnfamily in the system) has been
  +# flushed to sstables.  
  +#
  +# The default size is 32, which is almost always fine, but if you are
  +# archiving commitlog segments (see commitlog_archiving.properties),
  +# then you probably want a finer granularity of archiving; 8 or 16 MB
  +# is reasonable.
  +commitlog_segment_size_in_mb: 32
   
   # any class that implements the SeedProvider interface and has a
   # constructor that takes a Map<String, String> of parameters will do.
  
positive.code: # slowly or too fast, you should look at
  # compaction_throughput_mb_per_sec first.
  #
  # This setting has no effect on LeveledCompactionStrategy.
  #
  # concurrent_compactors defaults to the number of cores.
  # Uncomment to make compaction mono-threaded, the pre-0.8 default.
  #concurrent_compactors: 1
  
negative.code: #  - PropertyFileSnitch:
  #    Proximity is determined by rack and data center, which are
  #    explicitly configured in cassandra-topology.properties.
  #  - GossipingPropertyFileSnitch
  #    The rack and datacenter for the local node are defined in
  #    cassandra-rackdc.properties and propagated to other nodes via gossip.  If
  #    cassandra-topology.properties exists, it is used as a fallback, allowing
  #    migration from the PropertyFileSnitch.
  #  - RackInferringSnitch:
  #    Proximity is determined by rack and data center, which are
  #    assumed to correspond to the 3rd and 2nd octet of each node's
  