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From "Kaide Mu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-8928) Add downgradesstables
Date Thu, 24 Mar 2016 13:50:25 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-8928?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15210247#comment-15210247
] 

Kaide Mu commented on CASSANDRA-8928:
-------------------------------------

Hi, [~pauloricardomg].
Thank you so much, just fixed format error and added ccm and StandaloneUpgrader to the proposal,
I didn't realize that dtest runs on ccm. I'll check them out.

Regarding {{OldFormatIterator}} and {{OldFormatDeserializer}}, I am trying to find them on
Git repository but I didn't find anything, maybe after setting up the development environment
I can decompile them. Also, can I use openJDK (7) instead of Oracle JDK? Because I'm trying
to setting up Cassandra (trunk) with IDEA according to [RunningCassandraInIDEA|http://wiki.apache.org/cassandra/RunningCassandraInIDEA|http://wiki.apache.org/cassandra/RunningCassandraInIDEA]
but it gives me a build failed error when I execute {{ant generate-idea-files}}.
{code}
build-project:
     [echo] apache-cassandra: /home/km/cassandra/build.xml
    [javac] Compiling 45 source files to /home/km/cassandra/build/classes/thrift
    [javac] javac: invalid target release: 1.8
    [javac] Usage: javac <options> <source files>
    [javac] use -help for a list of possible options

BUILD FAILED
/home/km/cassandra/build.xml:769: Compile failed; see the compiler error output for details.
{code}

I'll try it again, once I have it setted up, I'll take a look  along with other materials
[CASSANDRA-8888|https://issues.apache.org/jira/browse/CASSANDRA-8888] which seems more suitable
to start with.


> Add downgradesstables
> ---------------------
>
>                 Key: CASSANDRA-8928
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8928
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Tools
>            Reporter: Jeremy Hanna
>            Priority: Minor
>              Labels: gsoc2016, mentor
>
> As mentioned in other places such as CASSANDRA-8047 and in the wild, sometimes you need
to go back.  A downgrade sstables utility would be nice for a lot of reasons and I don't know
that supporting going back to the previous major version format would be too much code since
we already support reading the previous version.



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