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HDFS append on upgraded cluster
Hi All,


I have a question here.




1.       Cluster is having some blocks and its upgraded.

2.       As part of upgrade, in datanode side hardlinks are created for all

3.       Now one of the block is appended with the some more data

4.       Do rollback


Now what happens for the appended data..?


Since blocks are hardlinked, changes on the original file will reflect on
the hardlinked file inside previous  also.


So changes to a appended block after upgrade will not be reverted after


How to handle this case..?


Any thoughts..?



   Vinayakumar B.,

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Todd Lipcon 2012-11-19, 19:10