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From "Sylvain Lebresne (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4843) When upgrading from 1.1.6 to 1.20 change in partitioner causes nodes not to start
Date Tue, 23 Oct 2012 06:21:12 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4843?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13482149#comment-13482149
] 

Sylvain Lebresne commented on CASSANDRA-4843:
---------------------------------------------

bq. but you have to know (or think you know) the partitioner before you can actually open
up a system table

I don't think you do since the system table keyspace uses LocalStrategy (and this is hardcoded).
That being said, even if we start saving the partitioner in the system table, it's possibly
a little late for the upgrade to 1.2. I still think we should do it for 1.1.7 though (but
to be clear, I'm all for keeping the panic doublecheck when we open a sstable because that
protects again a different problem anyway).
                
> When upgrading from 1.1.6 to 1.20 change in partitioner causes nodes not to start
> ---------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-4843
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4843
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Edward Capriolo
>             Fix For: 1.2.0
>
>
> ERROR 10:17:20,341 Cannot open /home/edward/cassandra/data/system/schema_keyspaces/system-schema_keyspaces-hf-1
because partitioner does not match org.apache.cassandra.dht.RandomPartitioner != org.apache.cassandra.dht.Murmur3Partitioner
> This is because 1.2 has a new default partitioner, why are we changing the default? Is
this wise? The current partitioner has been rock solid for years. 
> Should the previously known partition be stored in the schema like the previously know
seed nodes, and schema?

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