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https://issues.apache.org/jira/browse/HADOOP-1700?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ruyue Ma updated HADOOP-1700:
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Attachment: append.patch
this patch gives a simple append implementation based on 0.15.1 version. it is
completely compatible with the 0.15.1. It adds a new open() function in
DFSClient class.
Usage:
1. open for read
InputStream is = (FSDataInputStream)dfsclient.open(path, buffersize, "r");
2. open for append
OutputStream os = (FSDataOutputStream)dfsclient.open(path, buffersize, "a");
3. open for append (if no file, create it)
OutputStream os = (FSDataOutputStream)dfsclient.open(path, buffersize,
"a＋c");
> Append to files in HDFS
> -----------------------
>
> Key: HADOOP-1700
> URL: https://issues.apache.org/jira/browse/HADOOP-1700
> Project: Hadoop
> Issue Type: New Feature
> Components: dfs
> Reporter: stack
> Attachments: append.patch, Appends.doc, Appends.doc, Appends.html
>
>
> Request for being able to append to files in HDFS has been raised a couple of
> times on the list of late. For one example, see
> http://www.nabble.com/HDFS%2C-appending-writes-status-tf3848237.html#a10916193.
> Other mail describes folks' workarounds because this feature is lacking:
> e.g. http://www.nabble.com/Loading-data-into-HDFS-tf4200003.html#a12039480
> (Later on this thread, Jim Kellerman re-raises the HBase need of this
> feature). HADOOP-337 'DFS files should be appendable' makes mention of file
> append but it was opened early in the life of HDFS when the focus was more on
> implementing the basics rather than adding new features. Interest fizzled.
> Because HADOOP-337 is also a bit of a grab-bag -- it includes truncation and
> being able to concurrently read/write -- rather than try and breathe new life
> into HADOOP-337, instead, here is a new issue focused on file append.
> Ultimately, being able to do as the google GFS paper describes -- having
> multiple concurrent clients making 'Atomic Record Append' to a single file
> would be sweet but at least for a first cut at this feature, IMO, a single
> client appending to a single HDFS file letting the application manage the
> access would be sufficent.
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