add refetch logic

Author: hfutatzhanghb

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSStripedInputStream.java

@@ -277,12 +277,14 @@ boolean createBlockReader(LocatedBlock block, long offsetInBlock,
           if (curRetryCounts++ < readDNMaxRetryCounts) {
             DFSClient.LOG.info("Try to reconnect to {} for block {} for {} time.", dnInfo.addr,
                 block.getBlock(), curRetryCounts);
+            // Re-fetch the block in case the block has been moved.
+            fetchBlockAt(block.getStartOffset());
             continue;
           }
           //TODO: handles connection issues
           DFSClient.LOG.warn("Failed to connect to {} for block {} after retrying {} time.",
               dnInfo.addr, block.getBlock(), curRetryCounts, e);
-          // re-fetch the block in case the block has been moved
+          // Re-fetch the block in case the block has been moved
           fetchBlockAt(block.getStartOffset());
           addToLocalDeadNodes(dnInfo.info);
         }