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https://issues.apache.org/jira/browse/CASSANDRA-6740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13907489#comment-13907489
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Brandon Williams commented on CASSANDRA-6740:
---------------------------------------------
We do nothing, until there's schema for whatever you left in the data dir, and
then we load it.
> Non-empty flush directory causes NPE on startup
> -----------------------------------------------
>
> Key: CASSANDRA-6740
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6740
> Project: Cassandra
> Issue Type: Bug
> Reporter: Ryan McGuire
> Assignee: Jonathan Ellis
> Priority: Minor
>
> With the changes in CASSANDRA-6357, there is now the case where someone may
> want to start a fresh cluster on a machine that previously hosted one, clean
> out the directories they are familiar with (eg, data_file_directories,
> commitlog_directories) but fail to clean out the flush_directory. If they
> don't clean that out, they will see this in the logs:
> {code}
> INFO [main] 2014-02-19 12:20:13,530 ColumnFamilyStore.java:281 -
> Initializing system.IndexInfo
> INFO [main] 2014-02-19 12:20:13,534 ColumnFamilyStore.java:281 -
> Initializing system.peers
> INFO [main] 2014-02-19 12:20:13,539 ColumnFamilyStore.java:281 -
> Initializing system.local
> ERROR [main] 2014-02-19 12:20:13,703 CassandraDaemon.java:458 - Exception
> encountered during startup
> java.lang.NullPointerException: null
> at
> org.apache.cassandra.utils.ByteBufferUtil.string(ByteBufferUtil.java:167)
> ~[main/:na]
> at
> org.apache.cassandra.serializers.AbstractTextSerializer.deserialize(AbstractTextSerializer.java:39)
> ~[main/:na]
> at
> org.apache.cassandra.serializers.AbstractTextSerializer.deserialize(AbstractTextSerializer.java:26)
> ~[main/:na]
> at
> org.apache.cassandra.db.marshal.AbstractType.compose(AbstractType.java:66)
> ~[main/:na]
> at
> org.apache.cassandra.cql3.UntypedResultSet$Row.getString(UntypedResultSet.java:150)
> ~[main/:na]
> at
> org.apache.cassandra.config.CFMetaData.fromSchemaNoTriggers(CFMetaData.java:1761)
> ~[main/:na]
> at
> org.apache.cassandra.config.CFMetaData.fromSchema(CFMetaData.java:1883)
> ~[main/:na]
> at
> org.apache.cassandra.config.KSMetaData.deserializeColumnFamilies(KSMetaData.java:320)
> ~[main/:na]
> at
> org.apache.cassandra.config.KSMetaData.fromSchema(KSMetaData.java:301)
> ~[main/:na]
> at
> org.apache.cassandra.db.DefsTables.loadFromKeyspace(DefsTables.java:131)
> ~[main/:na]
> at
> org.apache.cassandra.config.DatabaseDescriptor.loadSchemas(DatabaseDescriptor.java:539)
> ~[main/:na]
> at
> org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:230)
> [main/:na]
> at
> org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:441)
> [main/:na]
> at
> org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:530)
> [main/:na]
> {code}
> I suggest a better warning message telling them it's due to the unclean flush
> dir, instead of an NPE.
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