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https://issues.apache.org/jira/browse/HDFS-2149?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13065802#comment-13065802
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Ivan Kelly commented on HDFS-2149:
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REPOST from HDFS-1073:
HDFS-2149 will probably remove LogHeader completely. I plan to add a
getVersion() call to InputStreams and each stream will handle it's own metadata
internally. So EditLogFileInputStream will read it's version on creation, or
first call to read etc. The input and output stream will be packet based, so an
input stream is basically an iterator over FSEditLogOp objects and output
stream is a sink for FSEditLogOp objects. I think the way I've implemented the
FSEditLogOp objects should avoid all extra copies and object creation. Whats
more, there's plenty to room to improve this by removing the creation of
ArrayWritables and DeprecatedUTF8 objects and just write strings and arrays
directly.
> Move EditLogOp serialisation and deserialation into one place
> -------------------------------------------------------------
>
> Key: HDFS-2149
> URL: https://issues.apache.org/jira/browse/HDFS-2149
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Ivan Kelly
> Assignee: Ivan Kelly
> Fix For: 0.23.0
>
> Attachments: HDFS-2149.diff
>
>
> On trunk serialisation of editlog ops is in FSEditLog#log* and
> deserialisation is in FSEditLogOp.*Op . This improvement is to move the
> serialisation code into one place, i.e under FSEditLogOp.*Op.
> This is part of HDFS-1580.
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