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HDFS, mail # dev - HDFS append on upgraded cluster


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HDFS append on upgraded cluster
Vinayakumar B 2012-11-16, 07:00
Hi All,

 

I have a question here.

 

Scenario:

--------------

1.       Cluster is having some blocks and its upgraded.

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

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
rollback.

 

How to handle this case..?

 

Any thoughts..?

 

Regards,

   Vinayakumar B.,

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