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https://issues.apache.org/jira/browse/HADOOP-7178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13059185#comment-13059185
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Uma Maheswara Rao G commented on HADOOP-7178:
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Hi Todd,
Thanks for the comments.
{quote}
I don't agree with the intent of this issue. Adding a new flag to turn on/off
the writing of checksums sounds reasonable – but disabling the writing of
checksums based on whether you asked to verify it on the way out of HDFS seems
like an unrelated choice.
{quote}
Agree :-). As you said, Using setVerifyChecksum api to control the checksum
outs may not be correct choice.
To maintain the consistancy, we can provide one API on FileSystem, i.e,
fs.ignoreCRC().
Internally this API should take care of setting the flag setVerifyChecksum to
false and also should select the non CheckSumFileSystem as local file system. I
think, this should be fine.
Initially we thought like, why we need to create the checksum out when user
don't want to do any checksum related verification. this may be little bit
confusion when we look at the api setVerifyChecksum. I will update the issue
title as well.
Please give your opinion also.
As i know this particular behavior already available with command line.
This issue mainly for selecting the local side file system based on the flag.
Copying the checksum outs will be depending on the fileSystem which it selects
at that point.
This is handled in command line options by providing the option 'ignoreCrc'
this flag also will set the setVerifyChecksum to false on FileSystem.
> copyToLocal API is creating .crc files in local, even after setting
> verifyChecksum to false at client side.
> -----------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-7178
> URL: https://issues.apache.org/jira/browse/HADOOP-7178
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Uma Maheswara Rao G
> Assignee: Uma Maheswara Rao G
> Attachments: HADOOP-7178_COMMON.patch, HADOOP-7178_HDFS.patch
>
>
> When we copy the files from DFS to local, it is creating the .crc file in
> local filesystem for the verification of checksum even if we disable the
> checksum verification at client side.
> When user does not want to do any checksum verification, then what
> will be the use in creating of these files in local file system.
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