After NameNode restart , Clients can not read partial files even after client
invokes Sync.
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Key: HDFS-1779
URL: https://issues.apache.org/jira/browse/HDFS-1779
Project: Hadoop HDFS
Issue Type: Bug
Components: data-node, name-node
Affects Versions: 0.20-append
Environment: Linux
Reporter: Uma Maheswara Rao G
In Append HDFS-200 issue,
If file has 10 blocks and after writing 5 blocks if client invokes sync method
then NN will persist the blocks information in edits.
After this if we restart the NN, All the DataNodes will reregister with NN. But
DataNodes are not sending the blocks being written information to NN. DNs are
sending the blocksBeingWritten information in DN startup. So, here NameNode can
not find that the 5 persisted blocks belongs to which datanodes. This
information can build based on block reports from DN. Otherwise we will loose
this 5 blocks information even NN persisted that block information in edits.
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