hadoop 运行异常，ReplicaNotFoundException

浏览线上运行日志，发现大量报错信息，截取一条，希望大虾能帮助解决。

May 5, 10:07:30.620 AM ERROR org.apache.hadoop.hdfs.server.datanode.DataNode
hadoop-78:50010:DataXceiver error processing READ_BLOCK operation src: /192.0.0.78:34568 dst: /192.0.0.78:50010
org.apache.hadoop.hdfs.server.datanode.ReplicaNotFoundException: Replica not found for BP-381875526-172.18.50.76-1450327742712:blk_1075578327_1837535
at org.apache.hadoop.hdfs.server.datanode.BlockSender.getReplica(BlockSender.java:450)
at org.apache.hadoop.hdfs.server.datanode.BlockSender.(BlockSender.java:234)
at org.apache.hadoop.hdfs.server.datanode.DataXceiver.readBlock(DataXceiver.java:530)
at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.opReadBlock(Receiver.java:148)
at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.processOp(Receiver.java:103)
at org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:244)
at java.lang.Thread.run(Thread.java:745)