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我試圖從2.2.1升級卡桑德拉到3.0.0，但卡桑德拉不啓動：卡桑德拉從2.2.1升級到3.0.0失敗NullPointerException異常
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]
任何人都面臨着這個問題？ 這裏我也提出了一個問題： https://issues.apache.org/jira/browse/CASSANDRA-10788
這裏是TRACE級別的日誌：
TRACE [MemtablePostFlush:1] 2015-12-01 16:47:52,675 ColumnFamilyStore.java:868 - forceFlush requested but everything is clean in schema_columns
TRACE [main] 2015-12-01 16:47:52,675 ColumnFamilyStore.java:1563 - Snapshot for Keyspace(name='system') keyspace data file /data/system/schema_columns-296e9c049bec3085827dc17d3df2122a/la-46-big-Data.db created in /data/system/schema_columns-296e9c049bec3085827dc17d3df2122a/snapshots/1448984872341-upgrade-2.2.1-3.0.0
TRACE [main] 2015-12-01 16:47:52,676 ColumnFamilyStore.java:1563 - Snapshot for Keyspace(name='system') keyspace data file /data/system/schema_columns-296e9c049bec3085827dc17d3df2122a/la-45-big-Data.db created in /data/system/schema_columns-296e9c049bec3085827dc17d3df2122a/snapshots/1448984872341-upgrade-2.2.1-3.0.0
TRACE [main] 2015-12-01 16:47:52,676 ColumnFamilyStore.java:1563 - Snapshot for Keyspace(name='system') keyspace data file /data/system/schema_columns-296e9c049bec3085827dc17d3df2122a/la-47-big-Data.db created in /data/system/schema_columns-296e9c049bec3085827dc17d3df2122a/snapshots/1448984872341-upgrade-2.2.1-3.0.0
TRACE [main] 2015-12-01 16:47:52,676 SystemKeyspace.java:1327 - Checking directory /data for old files
ERROR [main] 2015-12-01 16:47:52,751 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]
它看起來像代碼預計的舊文件/ data目錄下，但它無法找到任何和調用文件實用程序.delete（空）。