1

首先，我读到了这个。

我无法让 Cassandra 重新启动并运行。我使用 Hector 作为我的客户端来连接到 Cassandra 0.8.2 的实例并加载我的模式。通过 Hector，我使用 2 个不同的类来创建 2 个不同的列族 - Articles & TagsArticlesCF。

通过主类，我创建了一个名为“Articles”和“TagsArticlesCF”的列族，如下所示：

public static void main(String[] args) {
    cluster = HFactory.getOrCreateCluster("test cluster", "xxx.xxx.xxx.xxx:9160");
    newKeyspaceDef = HFactory.createKeyspaceDefinition(keyspaceName);
    if( (cluster.describeKeyspace(keyspaceName)) == null){
        createSchema();
    }


    Keyspace ksp = HFactory.createKeyspace(keyspaceName, cluster);
    Articles art = new Articles(cluster, newKeyspaceDef,ksp);
TagsArticlesCF tags = new TagsArticlesCF(cluster,newKeyspaceDef,ksp);

这是我的列族的外观/创建方式的示例：

public Articles(Cluster cluster, KeyspaceDefinition ksp, Keyspace ksp2)  {
BasicColumnFamilyDefinition bcfDef = new BasicColumnFamilyDefinition();
        bcfDef.setName("Articles");
        bcfDef.setKeyspaceName("test3");
        bcfDef.setDefaultValidationClass(ComparatorType.UTF8TYPE.getClassName());
        bcfDef.setKeyValidationClass(ComparatorType.UTF8TYPE.getClassName());
        bcfDef.setComparatorType(ComparatorType.UTF8TYPE);

        ColumnFamilyDefinition cfDef = new ThriftCfDef(bcfDef);
        BasicColumnDefinition columnDefinition = new BasicColumnDefinition();
        columnDefinition.setName(StringSerializer.get().toByteBuffer("title"));
        columnDefinition.setIndexType(ColumnIndexType.KEYS);
        columnDefinition.setValidationClass(ComparatorType.UTF8TYPE.getClassName());
        cfDef.addColumnDefinition(columnDefinition);
...

我正在尝试将完整的模式添加到 Cassandra 中，该模式将支持我计划对加载的数据执行的查询。我运行了几次 main 方法将新的列族加载到数据库中。在多次运行 main 方法并调整了一些东西（检查列族是否已经在 KeyspaceDefinition 中）之后，Cassandra 的运行实例停止了。

我对使用 Hector/java 的一些事情感到好奇：

  1. 我计划有 10 个左右不同列的列族（以支持不同的查询）。最好的做法是组织我的课程，以便我为每个列族都有一个课程？

  2. KeyspaceDefinition 和 Keyspace 之间到底有什么区别？为什么要区分？

我们试图获取 Cassandra 的新实例，这就是我们遇到的问题。我正在努力更好地了解发生了什么，任何评论和帮助避免这些类型的错误将不胜感激：

[root@appscluster1 bin]# ./cassandra -p cassandra.pid
[root@appscluster1 bin]#  INFO 10:52:36,437 Logging initialized
 INFO 10:52:36,484 JVM vendor/version: Java HotSpot(TM) 64-Bit Server VM/1.6.0_25
 INFO 10:52:36,485 Heap size: 1046937600/1046937600
 INFO 10:52:36,490 JNA not found. Native methods will be disabled.
 INFO 10:52:36,526 Loading settings from file:/opt/cassandra/apache-cassandra-0.8.2/conf/cassandra.yaml

[root@appscluster1 bin]#  INFO 10:52:36,872 DiskAccessMode 'auto' determined to be mmap, indexAccessMode is mmap
 INFO 10:52:37,346 Global memtable threshold is enabled at 332MB
 INFO 10:52:37,348 Removing compacted SSTable files (see http://wiki.apache.org/cassandra/MemtableSSTable)
 INFO 10:52:37,497 Removing compacted SSTable files (see http://wiki.apache.org/cassandra/MemtableSSTable)
 INFO 10:52:37,617 Removing compacted SSTable files (see http://wiki.apache.org/cassandra/MemtableSSTable)
 INFO 10:52:37,984 Removing compacted SSTable files (see http://wiki.apache.org/cassandra/MemtableSSTable)
 INFO 10:52:38,252 Removing compacted SSTable files (see http://wiki.apache.org/cassandra/MemtableSSTable)
 INFO 10:52:38,259 Removing compacted SSTable files (see http://wiki.apache.org/cassandra/MemtableSSTable)
 INFO 10:52:38,545 Opening /opt/cassandra/persist8/data/system/IndexInfo-g-73
 INFO 10:52:38,661 Opening /opt/cassandra/persist8/data/system/Schema-g-169
 INFO 10:52:38,685 Opening /opt/cassandra/persist8/data/system/Schema-g-170
 INFO 10:52:38,730 Opening /opt/cassandra/persist8/data/system/Schema-g-171
 INFO 10:52:38,751 Opening /opt/cassandra/persist8/data/system/Migrations-g-171
 INFO 10:52:38,763 Opening /opt/cassandra/persist8/data/system/Migrations-g-170
 INFO 10:52:38,776 Opening /opt/cassandra/persist8/data/system/Migrations-g-169
 INFO 10:52:38,795 Opening /opt/cassandra/persist8/data/system/LocationInfo-g-2
 INFO 10:52:38,827 Opening /opt/cassandra/persist8/data/system/LocationInfo-g-1
 INFO 10:52:39,048 Loading schema version ec437ac0-d28a-11e0-0000-c4ffed3367ff
 INFO 10:52:39,645 Removing compacted SSTable files (see http://wiki.apache.org/cassandra/MemtableSSTable)
 INFO 10:52:39,663 Removing compacted SSTable files (see http://wiki.apache.org/cassandra/MemtableSSTable)

...（更多相同）...

 INFO 10:52:40,463 Removing compacted SSTable files (see http://wiki.apache.org/cassandra/MemtableSSTable)
 INFO 10:52:41,390 Opening /opt/cassandra/persist8/data/test3/Articles-g-367
ERROR 10:52:41,392 Missing sstable component in /opt/cassandra/persist8/data/test3/Articles-g-367=[Index.db, Data.db]; skipped because of /opt/cassandra/persist8/data/test3/Articles-g-367-Index.db (No such file or directory)
 INFO 10:52:41,863 Removing compacted SSTable files (see http://wiki.apache.org/cassandra/MemtableSSTable)
 INFO 10:52:41,865 Removing compacted SSTable files (see http://wiki.apache.org/cassandra/MemtableSSTable)

...（更多相同）...

 INFO 10:52:41,892 Removing compacted SSTable files (see http://wiki.apache.org/cassandra/MemtableSSTable)
ERROR 10:52:41,898 Exception encountered during startup.
java.lang.RuntimeException: javax.management.InstanceAlreadyExistsException: org.apache.cassandra.db:type=ColumnFamilies,keyspace=test3,columnfamily=TagsArticlesCF
       at org.apache.cassandra.db.ColumnFamilyStore.<init>(ColumnFamilyStore.java:315)
       at org.apache.cassandra.db.ColumnFamilyStore.createColumnFamilyStore(ColumnFamilyStore.java:466)
       at org.apache.cassandra.db.ColumnFamilyStore.createColumnFamilyStore(ColumnFamilyStore.java:436)
       at org.apache.cassandra.db.Table.initCf(Table.java:369)
       at org.apache.cassandra.db.Table.<init>(Table.java:306)
       at org.apache.cassandra.db.Table.open(Table.java:111)
       at org.apache.cassandra.service.AbstractCassandraDaemon.setup(AbstractCassandraDaemon.java:187)
       at org.apache.cassandra.service.AbstractCassandraDaemon.activate(AbstractCassandraDaemon.java:341)
       at org.apache.cassandra.thrift.CassandraDaemon.main(CassandraDaemon.java:80)
Caused by: javax.management.InstanceAlreadyExistsException: org.apache.cassandra.db:type=ColumnFamilies,keyspace=test3,columnfamily=TagsArticlesCF
       at com.sun.jmx.mbeanserver.Repository.addMBean(Repository.java:453)
       at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.internal_addObject(DefaultMBeanServerInterceptor.java:1484)
       at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerDynamicMBean(DefaultMBeanServerInterceptor.java:963)
       at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerObject(DefaultMBeanServerInterceptor.java:917)
       at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:312)
       at com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:482)
       at org.apache.cassandra.db.ColumnFamilyStore.<init>(ColumnFamilyStore.java:311)
       ... 8 more
Exception encountered during startup.
java.lang.RuntimeException: javax.management.InstanceAlreadyExistsException: org.apache.cassandra.db:type=ColumnFamilies,keyspace=test3,columnfamily=TagsArticlesCF
       at org.apache.cassandra.db.ColumnFamilyStore.<init>(ColumnFamilyStore.java:315)
       at org.apache.cassandra.db.ColumnFamilyStore.createColumnFamilyStore(ColumnFamilyStore.java:466)
       at org.apache.cassandra.db.ColumnFamilyStore.createColumnFamilyStore(ColumnFamilyStore.java:436)
       at org.apache.cassandra.db.Table.initCf(Table.java:369)
       at org.apache.cassandra.db.Table.<init>(Table.java:306)
       at org.apache.cassandra.db.Table.open(Table.java:111)
       at org.apache.cassandra.service.AbstractCassandraDaemon.setup(AbstractCassandraDaemon.java:187)
       at org.apache.cassandra.service.AbstractCassandraDaemon.activate(AbstractCassandraDaemon.java:341)
       at org.apache.cassandra.thrift.CassandraDaemon.main(CassandraDaemon.java:80)
Caused by: javax.management.InstanceAlreadyExistsException: org.apache.cassandra.db:type=ColumnFamilies,keyspace=test3,columnfamily=TagsArticlesCF
       at com.sun.jmx.mbeanserver.Repository.addMBean(Repository.java:453)
       at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.internal_addObject(DefaultMBeanServerInterceptor.java:1484)
       at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerDynamicMBean(DefaultMBeanServerInterceptor.java:963)
       at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerObject(DefaultMBeanServerInterceptor.java:917)
       at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:312)
       at com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:482)
       at org.apache.cassandra.db.ColumnFamilyStore.<init>(ColumnFamilyStore.java:311)
       ... 8 more

[root@appscluster1 bin]#

谢谢！

4

1 回答 1

3

您如何将 Keyspace 定义发送到集群？

看看以下测试用例的方法： https ://github.com/rantav/hector/blob/master/core/src/test/java/me/prettyprint/cassandra/service/CassandraClusterTest.java#L115-189

如果键空间和/或列族已经存在，您应该能够捕获 IllegalArgumentException。

于 2011-09-02T17:43:00.263 回答