hbase client ipc异常

部分客户端不定期抛出如下异常：

org.apache.hadoop.hbase.exceptions.ConnectionClosingException: IPC Client (1890328395) connection to 主机名/IP:60020 from appops is closing 
at org.apache.hadoop.hbase.ipc.RpcClientImpl$Connection.checkIsOpen(RpcClientImpl.java:517) 
at org.apache.hadoop.hbase.ipc.RpcClientImpl$Connection.writeRequest(RpcClientImpl.java:925) 
at org.apache.hadoop.hbase.ipc.RpcClientImpl$Connection.tracedWriteRequest(RpcClientImpl.java:889) 
at org.apache.hadoop.hbase.ipc.RpcClientImpl.call(RpcClientImpl.java:1222) 
at org.apache.hadoop.hbase.ipc.AbstractRpcClient.callBlockingMethod(AbstractRpcClient.java:213) 
at org.apache.hadoop.hbase.ipc.AbstractRpcClient$BlockingRpcChannelImplementation.callBlockingMethod(AbstractRpcClient.java:287) 
at org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$BlockingStub.multi(ClientProtos.java:32699) 
at org.apache.hadoop.hbase.client.MultiServerCallable.call(MultiServerCallable.java:129) 
at org.apache.hadoop.hbase.client.MultiServerCallable.call(MultiServerCallable.java:54) 
at org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithoutRetries$SentryProxy1(RpcRetryingCaller.java:200) 
at org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithoutRetries(RpcRetryingCaller.java) 
at org.apache.hadoop.hbase.client.AsyncProcess$AsyncRequestFutureImpl$SingleServerRequestRunnable.run(AsyncProcess.java:708) 
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) 
at java.util.concurrent.FutureTask.run(FutureTask.java:266) 
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
at java.lang.Thread.run(Thread.java:745)

重启客户端后可解决，但原因不清楚。

服务端版本是1.2.6，客户端版本是1.1.2。怀疑可能是两端版本不一致，求大神解惑！