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https://issues.apache.org/jira/browse/HADOOP-11794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15935803#comment-15935803
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Yongjun Zhang commented on HADOOP-11794:
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Thanks [~omkarksa].
I chose the other method because the following one is marked as Deprecated. Not
sure why it was, it seems a convenient API to exist.
{code}
/**
* Same as this(NameNode.getNNAddress(conf), conf);
* @see #DFSClient(InetSocketAddress, Configuration)
* @deprecated Deprecated at 0.21
*/
@Deprecated
public DFSClient(Configuration conf) throws IOException {
this(DFSUtilClient.getNNAddress(conf), conf);
}
{code}
About other file systems, I did not get to test various file systems with this
patch (except for DistributedFileSystem), we could follow-up with new jira to
relax the file system requirement, and add corresponding tests for the
corresponding file system?
Hi [~atm], I will address the most recent comments since you reviewed last
time. Would you please take a look at rev8 to see if you have additional
comments?
Thanks a lot.
> distcp can copy blocks in parallel
> ----------------------------------
>
> Key: HADOOP-11794
> URL: https://issues.apache.org/jira/browse/HADOOP-11794
> Project: Hadoop Common
> Issue Type: Improvement
> Components: tools/distcp
> Affects Versions: 0.21.0
> Reporter: dhruba borthakur
> Assignee: Yongjun Zhang
> Attachments: HADOOP-11794.001.patch, HADOOP-11794.002.patch,
> HADOOP-11794.003.patch, HADOOP-11794.004.patch, HADOOP-11794.005.patch,
> HADOOP-11794.006.patch, HADOOP-11794.007.patch, HADOOP-11794.008.patch,
> MAPREDUCE-2257.patch
>
>
> The minimum unit of work for a distcp task is a file. We have files that are
> greater than 1 TB with a block size of 1 GB. If we use distcp to copy these
> files, the tasks either take a long long long time or finally fails. A better
> way for distcp would be to copy all the source blocks in parallel, and then
> stich the blocks back to files at the destination via the HDFS Concat API
> (HDFS-222)
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