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From "Aleksey Yeschenko (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-8609) Remove depency of hadoop to internals (Cell/CellName)
Date Mon, 18 May 2015 15:24:00 GMT

    [ 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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