HBASE-13337 Table regions are not assigning back, after restarting al…

…l regionservers at once.

Signed-off-by: stack <[email protected]>

hbase-client/src/main/java/org/apache/hadoop/hbase/ipc/AsyncRpcClient.java

@@ -360,7 +360,7 @@ private AsyncRpcChannel createRpcChannel(String serviceName, InetSocketAddress l
         throw new StoppedRpcClientException();
       }
       rpcChannel = connections.get(hashCode);
-      if (rpcChannel == null) {
+      if (rpcChannel == null || !rpcChannel.isAlive()) {
         rpcChannel = new AsyncRpcChannel(this.bootstrap, this, ticket, serviceName, location);
         connections.put(hashCode, rpcChannel);
       }