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From Adam Kawa <kawa.a...@gmail.com>
Subject Re: how to corrupt a replica of a block by manually?
Date Thu, 12 Dec 2013 01:41:06 GMT
Hmmm.. I guess that you can try to read this file using

$ hadoop fs -cat <file-with-corrupt-replica> to detect that

When reading a file its checksums are calculated and compared to checksums
that were calculated during a write operation. If verification fails, NN is
notified about the corrupt replica and you will fetch a different replica
from another DN to read that file.

2013/12/12 ch huang <justlooks@gmail.com>

> hi,maillist:
>         what is the sample way to corrupt a replica of a block ,i opened a
> replica data file ,and delete a line,than use fsck ,nothing corrupt,
>  should the DN  be restarted?

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