FAQ
Null pointer exception comes when Namenode recovery happens and there is no response from client to NN more than the hardlimit for NN recovery and the current block is more than the prev block size in NN
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Key: HDFS-1951
URL: https://issues.apache.org/jira/browse/HDFS-1951
Project: Hadoop HDFS
Issue Type: Bug
Components: name-node
Affects Versions: 0.20-append
Reporter: ramkrishna.s.vasudevan
Fix For: 0.20-append


Null pointer exception comes when Namenode recovery happens and there is no response from client to NN more than the hardlimit for NN recovery and the current block is more than the prev block size in NN
1. Write using a client to 2 datanodes
2. Kill one data node and allow pipeline recovery.
3. write somemore data to the same block
4. Parallely allow the namenode recovery to happen
Null pointer exception will come in addStoreBlock api.






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