public static ProcedurePrepareLatch createLatch() {
    // don't use the latch if we have procedure support (default 1.1)
    return createLatch(1, 1);
  }
Create a latch if the client does not have async proc support. This uses the default 1.1
version.
@return a CompatibilityLatch or a NoopLatch if the client has async proc support
hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/ProcedurePrepareLatch.java