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Posted to commits@cassandra.apache.org by "Aleksey Yeschenko (JIRA)" <ji...@apache.org> on 2015/05/18 17:24:00 UTC
[jira] [Commented] (CASSANDRA-8609) Remove depency of hadoop to
internals (Cell/CellName)
[ https://issues.apache.org/jira/browse/CASSANDRA-8609?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14548154#comment-14548154 ]
Aleksey Yeschenko commented on CASSANDRA-8609:
----------------------------------------------
With Thrift-based Hadoop code going away in 3.0/CASSANDRA-9353 it's important that the 2.2 versions of it can work without any internal dependencies (so that you can use the 2.2 versions with 3.0, if you need to).
> Remove depency of hadoop to internals (Cell/CellName)
> -----------------------------------------------------
>
> Key: CASSANDRA-8609
> URL: https://issues.apache.org/jira/browse/CASSANDRA-8609
> Project: Cassandra
> Issue Type: Bug
> Reporter: Sylvain Lebresne
> Assignee: Philip Thompson
> Fix For: 2.2 rc1
>
> Attachments: CASSANDRA-8609-3.0-branch.txt
>
>
> For some reason most of the Hadoop code (ColumnFamilyRecordReader, CqlStorage, ...) uses the {{Cell}} and {{CellName}} classes. That dependency is entirely artificial: all this code is really client code that communicate with Cassandra over thrift/native protocol and there is thus no reason for it to use internal classes. And in fact, thoses classes are used in a very crude way, as a {{Pair<ByteBuffer, ByteBuffer>}} really.
> But this dependency is really painful when we make changes to the internals. Further, every time we do so, I believe we break some of those the APIs due to the change. This has been painful for CASSANDRA-5417 and this is now painful for CASSANDRA-8099. But while I somewhat hack over it in CASSANDRA-5417, this was a mistake and we should have removed the depency back then. So let do that now.
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