Commits on Sep 9, 2014

1. Simplify translog interface …

   get rid of readSource() entirely, it sucked, Operations should be able
   to provide the source themselves.
   
   No more TranslogStream headers, you are now required to pass an
   StreamInput or StreamOutput for all operations, which means no extra
   state is needed and no need to construct new versions when detecting the
   version.
   
   Read and write translog op sizes in TranslogStreams
   
   Previously we handled these integers outside of the translog stream
   itself, which was very unclean because other code had to know about
   reading the size, or about writing the correct header sometimes.
   
   There is some additional code in LocalIndexShardGateway to handle the
   legacy case for older translogs, because we need to read and discard the
   size in order to maintain the compatibility for the streaming
   operations (they did not read or write the size for 1.3.x and earlier).
   
   Additionally, we need to handle a case where the header is truncated
   when recovering from disk
   
   Use a NoopStreamOutput instead of byte arrays
   
   Instead of writing translog operations to a temporary byte array and
   then writing that byte array to the stream, we now write the operation
   twice, once to a No-op stream to get the size, then again to the real
   size.
   
   This trades a little more CPU usage for less memory usage.

   

   dakrone committed Sep 9, 2014
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