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https://issues.apache.org/jira/browse/HDFS-222?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12756627#action_12756627
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Boris Shkolnik commented on HDFS-222:
-------------------------------------
here is the tentative plan:
# API void concat(String trg, String ... srcs) wil be added to
DistributedFileSystem and DFSClient.
# actual implemntation will be in FsNamesystem.java and FSDirectory.java
# The following prerequisites will be checked before the actual blocks will be
moved:
#* Files are not empty and not null
#* NameNode is not in the SafeMode
#* Permissions are valid:
#** Write permissions for target file
#** Read permissions for src files
#** Write permissions in the source parent directory (for delete).
# All the blocks of all the files are of the same size and same replication
level.
Actions:
# Actual blocks moved to the target file
# Access/Modification times to be updated of the following files:
#* target file
#* src directory
# Quotas updated:
#* Target directory - NSQuota +0, DSQuota +Sum(block sizes)
#* Src directory - NSQuota -1, DSQuoa -Sum(block sizes)
Errors handling using exceptions.
Note. Should srcs be an array instead of varargs? Seems safer and easier to use.
> Support for concatenating of files into a single file
> -----------------------------------------------------
>
> Key: HDFS-222
> URL: https://issues.apache.org/jira/browse/HDFS-222
> Project: Hadoop HDFS
> Issue Type: New Feature
> Reporter: Venkatesh S
> Assignee: Boris Shkolnik
>
> An API to concatenate files of same size and replication factor on HDFS into
> a single larger file.
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