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https://issues.apache.org/jira/browse/CASSANDRA-10788?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15036000#comment-15036000
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Stefania commented on CASSANDRA-10788:
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bq. I'd like to stop Cassandra and put the original JAR in place (downgrade
from 3.0.0-SNAPSHOT to 3.0.0). Should this work?
It should because the code with the bug only runs during an upgrade, if the
data was migrated correctly to 3.0, then that code should not run, at least
that's the theory.
> Upgrade from 2.2.1 to 3.0.0 fails with NullPointerException
> -----------------------------------------------------------
>
> Key: CASSANDRA-10788
> URL: https://issues.apache.org/jira/browse/CASSANDRA-10788
> Project: Cassandra
> Issue Type: Bug
> Components: Lifecycle
> Reporter: Tomas Ramanauskas
> Assignee: Stefania
> Fix For: 3.0.x, 3.x
>
>
> I tried to upgrade Cassandra from 2.2.1 to 3.0.0, however, I get this error
> on startup after Cassandra 3.0 software was installed:
> {code}
> ERROR [main] 2015-11-30 15:44:50,164 CassandraDaemon.java:702 - Exception
> encountered during startup
> java.lang.NullPointerException: null
> at org.apache.cassandra.io.util.FileUtils.delete(FileUtils.java:374)
> ~[apache-cassandra-3.0.0.jar:3.0.0]
> at
> org.apache.cassandra.db.SystemKeyspace.migrateDataDirs(SystemKeyspace.java:1341)
> ~[apache-cassandra-3.0.0.jar:3.0.0]
> at
> org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:180)
> [apache-cassandra-3.0.0.jar:3.0.0]
> at
> org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:561)
> [apache-cassandra-3.0.0.jar:3.0.0]
> at
> org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:689)
> [apache-cassandra-3.0.0.jar:3.0.0]
> {code}
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