stack created HBASE-19997:

             Summary: [rolling upgrade] 1.x => 2.x
                 Key: HBASE-19997
             Project: HBase
          Issue Type: Umbrella
            Reporter: stack
             Fix For: 2.0.0

An umbrella issue of issues needed so folks can do a rolling upgrade from 
hbase-1.x to hbase-2.x.

(Recent) Notables:
 * hbase-1.x can't read hbase-2.x WALs -- hbase-1.x doesn't know the 
AsyncProtobufLogWriter class used writing the WAL -- see
 for exception.
 ** Might be ok... means WAL split fails on an hbase1 RS... must wait till an 
hbase-2.x RS picks up the WAL for it to be split.
 * hbase-1 can't open regions from tables created by hbase-2; it can't find the 
Table descriptor. See
 ** This might be ok if the tables we are doing rolling upgrade over were 
written with hbase-1.

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