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From "Dmytro Molkov (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-1138) Modification times are being overwritten when FSImage loads
Date Mon, 10 May 2010 19:22:30 GMT
Modification times are being overwritten when FSImage loads

                 Key: HDFS-1138
                 URL: https://issues.apache.org/jira/browse/HDFS-1138
             Project: Hadoop HDFS
          Issue Type: Bug
            Reporter: Dmytro Molkov

A very easy way to spot the bug is to do a second restart in TestRestartDFS and check that
the modification time on root is the same as it was before the second restart.

The problem is modifying time of the parent if the modification time of the child is greater
than parent's in addToParent.

So if you have /DIR/File then on creation of a file modification time of the DIR will be set,
but on cluster restart, or when secondary is checkpointing and reading the image it will add
DIR to "/" and write the new modification time for "/" which is the modification time of DIR.

This is clearly a bug. I will attach a patch with one more parameter being passed from the
loadFSImage that says to not propagate the time.

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