ZanderXu commented on PR #4369:
URL: https://github.com/apache/hadoop/pull/4369#issuecomment-1152200912
> the source datanode meets issue and choose the same one when retry
It will chose the next datanode as source datanode when retry.
Code like blew, and tried will +1 when retry.
```
final DatanodeInfo src = original[tried % original.length];
final DatanodeInfo[] targets = {nodes[d]};
final StorageType[] targetStorageTypes = {storageTypes[d]};
try {
transfer(src, targets, targetStorageTypes, lb.getBlockToken());
} catch (IOException ioe) {
DFSClient.LOG.warn("Error transferring data from " + src + " to " +
nodes[d] + ": " + ioe.getMessage());
caughtException = ioe;
// add the allocated node to the exclude list.
exclude.add(nodes[d]);
setPipeline(original, originalTypes, originalIDs);
tried++;
continue;
}
```
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