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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] Reopened: (HADOOP-112) copyFromLocal should exclude .crc files
Date Wed, 05 Apr 2006 19:02:45 GMT
     [ http://issues.apache.org/jira/browse/HADOOP-112?page=all ]
     
Konstantin Shvachko reopened HADOOP-112:
----------------------------------------


I cannot see what exactly was committed here, but now regular dfs -cp doesn't
copy crc files, which causes e.g. dfs -cat complain about it.
I presume that changes were made to FileUtil.copyContents() which is called in
several places, which sometimes do and sometimes do not need crc files.
In case of dfs copy the crc files are needed.

> copyFromLocal should exclude .crc files
> ---------------------------------------
>
>          Key: HADOOP-112
>          URL: http://issues.apache.org/jira/browse/HADOOP-112
>      Project: Hadoop
>         Type: Bug

>   Components: dfs
>  Environment: DFS cluster of 6 3hz Xeons with 2Gb RAM running Centos 4.2 and Sun's JDK1.5
- but Probably applies in any environment
>     Reporter: Monu Ogbe
>     Assignee: Doug Cutting
>     Priority: Minor
>      Fix For: 0.1.0

>
> Doug Cutting says: "The problem is that when copyFromLocal 
> enumerates local files it should exclude .crc files, but it does not. 
> This is the listFiles() call on DistributedFileSystem:160.  It should 
> filter this, excluding files that are FileSystem.isChecksumFile().
> BTW, as a workaround, it is safe to first remove all of the .crc files, 
> but your files will no longer be checksummed as they are read.  On 
> systems without ECC memory file corruption is not uncommon, but I have 
> seen very little on clusters that have ECC."
> Original observations:
> Hello Team,
> I created a backup of my DFS database:
> # bin/hadoop dfs -copyToLocal /user/root/crawl /mylocaldir
> I now want to restore from the backup using:
> # bin/hadoop dfs -copyFromLocal /mylocaldir/crawl /user/root
> However I'm getting the following error:
> copyFromLocal: Target /user/root/crawl/crawldb/current/part-00000/.data.crc
> already exists
> I get this message with every permutation of the command that I've tried, and
> even after totally deleting all content in the DFS directories.
> I'd be grateful for any pointers.
> Many thanks,

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