ZanderXu opened a new pull request, #4813:
URL: https://github.com/apache/hadoop/pull/4813
### Description of PR
DFSClient should diff the writing files with namespaceId and iNodeId,
because the writing files may belongs to different namespace with the same
iNodeId.
And the related code as bellows:
```
public void putFileBeingWritten(final long inodeId,
final DFSOutputStream out) {
synchronized(filesBeingWritten) {
filesBeingWritten.put(inodeId, out);
// update the last lease renewal time only when there was no
// writes. once there is one write stream open, the lease renewer
// thread keeps it updated well with in anyone's expiration time.
if (lastLeaseRenewal == 0) {
updateLastLeaseRenewal();
}
}
}
```
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