Cassandra 从 2.2.1 升级到 3.0.0 失败并出现 NullPointerException

Question

我尝试将 Cassandra 从 2.2.1 升级到 3.0.0，但 Cassandra 没有启动：

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]

还有其他人遇到过这个问题吗？我在这里也提出了一个问题： https://issues.apache.org/jira/browse/CASSANDRA-10788

这是 TRACE 级别的日志记录：

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]

看起来代码应该是 /data 目录下的遗留文件，但它找不到任何并调用 FileUtils.delete(null)。

Answer 1

可能会影响迁移的一件事是 Datastax not recommended 将 2.1.x 转换为 3.0。

Cassandra 3.0.x restrictions

Upgrade from Cassandra 2.1 versions greater or equal to 2.1.9 or from Cassandra 2.2 versions greater or equal to 2.2.2.

*Emphasis added

由于不存在的文件或重复的删除调用，可能会出现空指针。

我会尝试在 3.0 迁移之前至少升级到 2.2.2。

Answer 2

我能够使用此补丁解决问题： https://github.com/stef1927/cassandra/commit/1c464adf097d323320ce11db6daf05e1a31c62b6

更多详情： https://issues.apache.org/jira/browse/CASSANDRA-10788

谢谢，我先看看从 2.2.1 升级到 2.2.2 是否有帮助。

Cassandra 从 2.2.1 升级到 3.0.0 失败并出现 NullPointerException

Cassandra upgrade from 2.2.1 to 3.0.0 fails with NullPointerException

cassandra

upgrade

cassandra-3.0