protected void startShippers() {
    for (String walGroupId : logQueue.getQueues().keySet()) {
      tryStartNewShipper(walGroupId);
    }
  }
Do the sleeping logic
@param msg             Why we sleep
@param sleepMultiplier by how many times the default sleeping time is augmented
@return True if <code>sleepMultiplier</code> is &lt; <code>maxRetriesMultiplier</code>
hbase-server/src/main/java/org/apache/hadoop/hbase/replication/regionserver/ReplicationSource.java