@Override
  protected LockState acquireLock(final MasterProcedureEnv env) {
    if (env.getProcedureScheduler().waitServerExclusiveLock(this, getServerName())) {
      return LockState.LOCK_EVENT_WAIT;
    }
    return LockState.LOCK_ACQUIRED;
  }
Split logs using 'classic' zk-based coordination. Superceded by procedure-based WAL splitting.
@see #createSplittingWalProcedures(MasterProcedureEnv, boolean)
hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/ServerCrashProcedure.java