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From "Chen Liang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-11939) Ozone : add read/write random access to Chunks of a key
Date Tue, 06 Jun 2017 22:57:18 GMT
Chen Liang created HDFS-11939:
---------------------------------

             Summary: 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


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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