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https://issues.apache.org/jira/browse/CASSANDRA-15208?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16909212#comment-16909212
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Jeremy Hanna commented on CASSANDRA-15208:
------------------------------------------
Just curious, why would you list the same data directory multiple times?
> Listing the same data directory multiple times can result in an
> java.lang.AssertionError: null on startup
> ---------------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-15208
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15208
> Project: Cassandra
> Issue Type: Bug
> Components: Local/Config
> Reporter: Damien Stevenson
> Priority: Normal
>
> Listing the same data directory multiple times in the yaml can result in an
> java.lang.AssertionError: null on startup.
> This error will only happen if Cassandra was stopped part way through an
> sstable operation (i.e a compaction) and is restarted
> Error:
> {noformat}
> Exception (java.lang.AssertionError) encountered during startup: null
> java.lang.AssertionError
> at
> org.apache.cassandra.db.lifecycle.LogReplicaSet.addReplica(LogReplicaSet.java:63)
> at java.util.ArrayList.forEach(ArrayList.java:1257)
> at
> org.apache.cassandra.db.lifecycle.LogReplicaSet.addReplicas(LogReplicaSet.java:57)
> at org.apache.cassandra.db.lifecycle.LogFile.<init>(LogFile.java:147)
> at org.apache.cassandra.db.lifecycle.LogFile.make(LogFile.java:95)
> at
> org.apache.cassandra.db.lifecycle.LogTransaction$LogFilesByName.removeUnfinishedLeftovers(LogTransaction.java:476)
> at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
> at java.util.HashMap$EntrySpliterator.tryAdvance(HashMap.java:1717)
> at
> java.util.stream.ReferencePipeline.forEachWithCancel(ReferencePipeline.java:126)
> at
> java.util.stream.AbstractPipeline.copyIntoWithCancel(AbstractPipeline.java:498)
> at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:485)
> at
> java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
> at java.util.stream.MatchOps$MatchOp.evaluateSequential(MatchOps.java:230)
> at java.util.stream.MatchOps$MatchOp.evaluateSequential(MatchOps.java:196)
> at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
> at java.util.stream.ReferencePipeline.allMatch(ReferencePipeline.java:454)
> at
> org.apache.cassandra.db.lifecycle.LogTransaction$LogFilesByName.removeUnfinishedLeftovers(LogTransaction.java:471)
> at
> org.apache.cassandra.db.lifecycle.LogTransaction.removeUnfinishedLeftovers(LogTransaction.java:438)
> at
> org.apache.cassandra.db.lifecycle.LogTransaction.removeUnfinishedLeftovers(LogTransaction.java:430)
> at
> org.apache.cassandra.db.lifecycle.LifecycleTransaction.removeUnfinishedLeftovers(LifecycleTransaction.java:549)
> at
> org.apache.cassandra.db.ColumnFamilyStore.scrubDataDirectories(ColumnFamilyStore.java:658)
> at
> org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:275)
> at
> org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:620)
> at org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:732)
> ERROR o.a.c.service.CassandraDaemon Exception encountered during startup
> java.lang.AssertionError: null
> at
> org.apache.cassandra.db.lifecycle.LogReplicaSet.addReplica(LogReplicaSet.java:63)
> ~[apache-cassandra-3.11.4.jar:3.11.4]
> at java.util.ArrayList.forEach(ArrayList.java:1257) ~[na:1.8.0_171]
> at
> org.apache.cassandra.db.lifecycle.LogReplicaSet.addReplicas(LogReplicaSet.java:57)
> ~[apache-cassandra-3.11.4.jar:3.11.4]
> at org.apache.cassandra.db.lifecycle.LogFile.<init>(LogFile.java:147)
> ~[apache-cassandra-3.11.4.jar:3.11.4]
> at org.apache.cassandra.db.lifecycle.LogFile.make(LogFile.java:95)
> ~[apache-cassandra-3.11.4.jar:3.11.4]
> at
> org.apache.cassandra.db.lifecycle.LogTransaction$LogFilesByName.removeUnfinishedLeftovers(LogTransaction.java:476)
> ~[apache-cassandra-3.11.4.jar:3.11>
> at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
> ~[na:1.8.0_171]
> at java.util.HashMap$EntrySpliterator.tryAdvance(HashMap.java:1717)
> ~[na:1.8.0_171]
> at
> java.util.stream.ReferencePipeline.forEachWithCancel(ReferencePipeline.java:126)
> ~[na:1.8.0_171]
> at
> java.util.stream.AbstractPipeline.copyIntoWithCancel(AbstractPipeline.java:498)
> ~[na:1.8.0_171]
> at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:485)
> ~[na:1.8.0_171]
> at
> java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
> ~[na:1.8.0_171]
> at java.util.stream.MatchOps$MatchOp.evaluateSequential(MatchOps.java:230)
> ~[na:1.8.0_171]
> at java.util.stream.MatchOps$MatchOp.evaluateSequential(MatchOps.java:196)
> ~[na:1.8.0_171]
> at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
> ~[na:1.8.0_171]
> at java.util.stream.ReferencePipeline.allMatch(ReferencePipeline.java:454)
> ~[na:1.8.0_171]
> at
> org.apache.cassandra.db.lifecycle.LogTransaction$LogFilesByName.removeUnfinishedLeftovers(LogTransaction.java:471)
> ~[apache-cassandra-3.11.4.jar:3.11>
> at
> org.apache.cassandra.db.lifecycle.LogTransaction.removeUnfinishedLeftovers(LogTransaction.java:438)
> ~[apache-cassandra-3.11.4.jar:3.11.4]
> at
> org.apache.cassandra.db.lifecycle.LogTransaction.removeUnfinishedLeftovers(LogTransaction.java:430)
> ~[apache-cassandra-3.11.4.jar:3.11.4]
> at
> org.apache.cassandra.db.lifecycle.LifecycleTransaction.removeUnfinishedLeftovers(LifecycleTransaction.java:549)
> ~[apache-cassandra-3.11.4.jar:3.11.4]
> at
> org.apache.cassandra.db.ColumnFamilyStore.scrubDataDirectories(ColumnFamilyStore.java:658)
> ~[apache-cassandra-3.11.4.jar:3.11.4]
> at
> org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:275)
> [apache-cassandra-3.11.4.jar:3.11.4]
> at
> org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:620)
> [apache-cassandra-3.11.4.jar:3.11.4]
> at
> org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:732)
> [apache-cassandra-3.11.4.jar:3.11.4]{noformat}
> Steps to recreate this behaviour:
> * Write data to Cassandra, wait for a largish compaction to start.
> * Kill Cassandra part way through the compaction
> * Check for the existence of a transaction log file in the data directory
> {noformat}
> cd /var/lib/cassandra/data
> find . -type f -iname '*.log'
> ./single/table0-3c161330a68d11e9af45010f0154fff5/md_txn_compaction_b492cd30-a68d-11e9-b727-010f0154fff5.log{noformat}
> * Duplicate the data directory entry in the yaml:
> {noformat}
> data_file_directories:
> - /var/lib/cassandra/data
> - /var/lib/cassandra/data{noformat}
> * Restart Cassandra.
> I have tested that this behaviour exists in the following versions of
> Cassandra:
> * 3.11.4
> * 3.0.15
> Workaround:
> * Remove the duplicate data directory entry from the Cassandra yaml
> Possible solutions:
> * Validate and filter data_file_directories input to ensure each data
> directory is unique
> * Fail gracefully, with a more meaningful error message.
>
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