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From Sean Bigdatafun <sean.bigdata...@gmail.com>
Subject How to fix a corrupted disk?
Date Thu, 10 Jun 2010 05:13:52 GMT
I have two questions here about a HDFS cell. Suppose the file that I am
interested is stored on 3 datanodes A, B, C. And A suddenly crashed, I
understand I can still read my file because I have two copies available at
this moment. But my question is which software module is responsible to
bring A back to running? (is there a watchdog server?)

Furthermore, if the disk on server A is totally corrupted (disk failure),
what should I do to bring my file back to 3 replication mode?

Thanks,
Sean

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