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From "Brandon Williams (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-3706) Back up configuration files on startup
Date Fri, 11 May 2012 15:36:50 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3706?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13273355#comment-13273355
] 

Brandon Williams commented on CASSANDRA-3706:
---------------------------------------------

I'm getting the following exception upon modifying a config and restarting:

{noformat}
 INFO 15:26:57,770 Opening /var/lib/cassandra/data/system_configuration/Configuration/system_configuration-Configuration-ia-1
(23286 bytes)
ERROR 15:26:57,788 Exception encountered during startup
java.lang.AssertionError
        at org.apache.cassandra.db.SystemTable.getCurrentLocalNodeId(SystemTable.java:582)
        at org.apache.cassandra.utils.NodeId$LocalNodeIdHistory.<init>(NodeId.java:194)
        at org.apache.cassandra.utils.NodeId$LocalIds.<clinit>(NodeId.java:42)
        at org.apache.cassandra.utils.NodeId.localIds(NodeId.java:49)
        at org.apache.cassandra.utils.NodeId.getLocalId(NodeId.java:54)
        at org.apache.cassandra.db.SystemTable.saveConfiguration(SystemTable.java:340)
        at org.apache.cassandra.service.AbstractCassandraDaemon.setup(AbstractCassandraDaemon.java:184)
        at org.apache.cassandra.service.AbstractCassandraDaemon.activate(AbstractCassandraDaemon.java:355)
        at org.apache.cassandra.thrift.CassandraDaemon.main(CassandraDaemon.java:105)
java.lang.AssertionError
        at org.apache.cassandra.db.SystemTable.getCurrentLocalNodeId(SystemTable.java:582)
        at org.apache.cassandra.utils.NodeId$LocalNodeIdHistory.<init>(NodeId.java:194)
        at org.apache.cassandra.utils.NodeId$LocalIds.<clinit>(NodeId.java:42)
        at org.apache.cassandra.utils.NodeId.localIds(NodeId.java:49)
        at org.apache.cassandra.utils.NodeId.getLocalId(NodeId.java:54)
        at org.apache.cassandra.db.SystemTable.saveConfiguration(SystemTable.java:340)
        at org.apache.cassandra.service.AbstractCassandraDaemon.setup(AbstractCassandraDaemon.java:184)
        at org.apache.cassandra.service.AbstractCassandraDaemon.activate(AbstractCassandraDaemon.java:355)
        at org.apache.cassandra.thrift.CassandraDaemon.main(CassandraDaemon.java:105)
Exception encountered during startup: null
{noformat}

Also, it would be nice to log at INFO when a new config is being saved.
                
> Back up configuration files on startup
> --------------------------------------
>
>                 Key: CASSANDRA-3706
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3706
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Tools
>            Reporter: Jonathan Ellis
>            Assignee: Dave Brosius
>            Priority: Minor
>              Labels: lhf
>             Fix For: 1.1.1
>
>         Attachments: save_configuration.diff, save_configuration_2.diff, save_configuration_3.diff,
save_configuration_4.diff, save_configuration_6.diff, save_configuration_7.diff, save_configuration_8.diff,
save_configuration_9.diff
>
>
> Snapshot can backup user data, but it's also nice to be able to have known-good configurations
saved as well in case of accidental snafus or even catastrophic loss of a cluster.  If we
check for changes to cassandra.yaml, cassandra-env.sh, and maybe log4j-server.properties on
startup, we can back them up to a columnfamily that can then be handled by normal snapshot/backup
procedures.

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