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https://issues.apache.org/jira/browse/HDFS-11939?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16052051#comment-16052051
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Xiaoyu Yao commented on HDFS-11939:
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[~vagarychen], thanks for working on this. I have a generic question about
implementing FileChannel for ChunkInputStream/ChunkOutputStream. Have we
consider implementing a simpler interface like
org.apache.hadoop.fs.Seekable/PositionedRead from FSInputStream/FSOutputStream
on top of existing ChunkInputStream/ChunkOutputStream? This way, we can avoid
many duplicate code between ChunkInputStream/ChunkOutputStream and the new
ChunkInputChannel/ChunkOutputChannel.
> Ozone : add read/write random access to Chunks of a key
> -------------------------------------------------------
>
> Key: HDFS-11939
> URL: https://issues.apache.org/jira/browse/HDFS-11939
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Chen Liang
> Assignee: Chen Liang
> Attachments: HDFS-11939-HDFS-7240.001.patch,
> HDFS-11939-HDFS-7240.002.patch, HDFS-11939-HDFS-7240.003.patch,
> HDFS-11939-HDFS-7240.004.patch
>
>
> In Ozone, the value of a key is a sequence of container chunks. Currently,
> the only way to read/write the chunks is by using ChunkInputStream and
> ChunkOutputStream. However, by the nature of streams, these classes are
> currently implemented to only allow sequential read/write.
> Ideally we would like to support random access of the chunks. For example, we
> want to be able to seek to a specific offset and read/write some data. This
> will be critical for key range read/write feature, and potentially important
> for supporting parallel read/write.
> This JIRA tracks adding support by implementing FileChannel class on top
> Chunks.
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