Sometimes DFSClient encounter an error when writing a file. All data nodes for the current block is gone.
In that case, DFSClient has only two options: 1. Delete the file. 2. Do nothing. The namenode will keep a lease on the file, and the DFSClient will have an idling thread for that file. For option 1, we won't be able to recover even the blocks that were successfully written. For option 2, we are wasting our resources - we should be able to clean up the lease and the thread, without shutting down the DFSClient and wait for 1-hour timeout on the lease. Is there anything better we can do in this case (recover all blocks that are successfully written, AND clean up the lease and the thread)? Is there any JIRA open for this? Thanks Yajun for discovering this. -- Yours, Zheng
