How can Hadoop discover missing or corrupt HDFS data

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I want to check my HDFS corrupt data. Which command does Hadoop offer to discover missing or corrupt HDFS data?

Please help!
Jul 19, 2018 in Big Data Hadoop by Shubham
 • 13,490 points • 1,458 views

1 answer to this question.

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HDFS supports fsck command to check for various inconsistencies.

It is designed for reporting problems with various files, for e.g. missing blocks for a file or under replicated blocks. Unlike a traditional fsck utility for native filesystems, this command does not correct the errors it detects.

Normally Namenode automatically corrects most of the recoverable failures. HDFS' fsck is not a Hadoop shell command. It can be run as 'bin/hadoop fsck'. Fsck can be run on the whole filesystem or on a subset of files.

Hope you understand.
answered Jul 19, 2018 by nitinrawat895
 • 11,380 points

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