在Orientdb中以分布式方式创建数据库

Question

我们的系统以编程方式创建 OrientDB 数据库，并为每个客户使用一个数据库（在任何人放弃此设计之前，原因是安全性、在数据中心/区域之间移动某些客户/数据的可能性以及迁移到本地的可能性)。

这在 OrientDB 的单一模式下非常有效。但是，当数据库以分布式模式（亚马逊上的 3 台服务器）设置时。委婉地说，这种行为很奇怪。我知道文档没有说明支持此功能，但我也找不到任何说明不支持的内容。

有时数据库创建得很好，但客户端无限期锁定（在OAdaptiveLock.lock() 中）。有时需要重新启动整个集群才能使用数据库，有时，在撰写本文时，一个 OrientDB 节点在似乎与其他节点同步后自行关闭（Address[1.2.3.4]:2434 is SHUTTING_DOWN [LifecycleService] -> @ 987654324@)。错误消息由堆栈跟踪（见下文）处理。

所以，对于我的问题：

1. OrientDB 是否支持以分布式模式在线创建数据库？
2. 如果是这样，我做错了什么？
3. 如果没有，是否有计划在未来支持此功能？

提前致谢！

./安德斯

堆栈跟踪：

2016-01-28 14:00:01:395 SEVER [infogile02] error on creating cluster 'superclassesedge_infogile02' in class 'superClassesEdge':  [OHazelcastPlugin][infogile02] Error on starting distributed plugin
com.orientechnologies.orient.server.distributed.ODistributedException: com.orientechnologies.orient.server.distributed.ODistributedException: Error on creating cluster 'superclassesedge_infogile02' in class 'superClassesEdge'
    at com.orientechnologies.orient.server.hazelcast.OHazelcastDistributedDatabase.configureDatabase(OHazelcastDistributedDatabase.java:241)
    at com.orientechnologies.orient.server.hazelcast.OHazelcastPlugin.installDatabaseFromNetwork(OHazelcastPlugin.java:1131)
    at com.orientechnologies.orient.server.hazelcast.OHazelcastPlugin.requestDatabase(OHazelcastPlugin.java:971)
    at com.orientechnologies.orient.server.hazelcast.OHazelcastPlugin.installDatabase(OHazelcastPlugin.java:908)
    at com.orientechnologies.orient.server.hazelcast.OHazelcastPlugin.installNewDatabases(OHazelcastPlugin.java:1468)
    at com.orientechnologies.orient.server.hazelcast.OHazelcastPlugin.startup(OHazelcastPlugin.java:185)
    at com.orientechnologies.orient.server.OServer.registerPlugins(OServer.java:979)
    at com.orientechnologies.orient.server.OServer.activate(OServer.java:346)
    at com.orientechnologies.orient.server.OServerMain.main(OServerMain.java:41)
Caused by: com.orientechnologies.orient.server.distributed.ODistributedException: Error on creating cluster 'superclassesedge_infogile02' in class 'superClassesEdge'
    at com.orientechnologies.orient.server.hazelcast.OHazelcastPlugin.installLocalClusterPerClass(OHazelcastPlugin.java:1631)
    at com.orientechnologies.orient.server.hazelcast.OHazelcastPlugin.installDbClustersForLocalNode(OHazelcastPlugin.java:1300)
    at com.orientechnologies.orient.server.hazelcast.OHazelcastPlugin$2.call(OHazelcastPlugin.java:1134)
    at com.orientechnologies.orient.server.hazelcast.OHazelcastPlugin$2.call(OHazelcastPlugin.java:1131)
    at com.orientechnologies.orient.server.hazelcast.OHazelcastDistributedDatabase.configureDatabase(OHazelcastDistributedDatabase.java:239)
    ... 8 more
Caused by: com.orientechnologies.orient.core.exception.ODatabaseException: Error on saving record #0:1
    at com.orientechnologies.orient.core.db.document.ODatabaseDocumentTx.executeSaveRecord(ODatabaseDocumentTx.java:2044)
    at com.orientechnologies.orient.core.tx.OTransactionNoTx.saveRecord(OTransactionNoTx.java:159)
    at com.orientechnologies.orient.core.db.document.ODatabaseDocumentTx.save(ODatabaseDocumentTx.java:2568)
    at com.orientechnologies.orient.core.db.document.ODatabaseDocumentTx.save(ODatabaseDocumentTx.java:121)
    at com.orientechnologies.orient.core.record.impl.ODocument.save(ODocument.java:1768)
    at com.orientechnologies.orient.core.record.impl.ODocument.save(ODocument.java:1764)
    at com.orientechnologies.orient.core.metadata.schema.OSchemaShared$1.call(OSchemaShared.java:1213)
    at com.orientechnologies.orient.core.db.OScenarioThreadLocal.executeAsDistributed(OScenarioThreadLocal.java:71)
    at com.orientechnologies.orient.core.metadata.schema.OSchemaShared.saveInternal(OSchemaShared.java:1208)
    at com.orientechnologies.orient.core.metadata.schema.OSchemaShared.releaseSchemaWriteLock(OSchemaShared.java:642)
    at com.orientechnologies.orient.core.metadata.schema.OClassImpl.releaseSchemaWriteLock(OClassImpl.java:1824)
    at com.orientechnologies.orient.core.metadata.schema.OClassImpl.releaseSchemaWriteLock(OClassImpl.java:1819)
    at com.orientechnologies.orient.core.metadata.schema.OClassImpl.addCluster(OClassImpl.java:1088)
    at com.orientechnologies.orient.server.hazelcast.OHazelcastPlugin.installLocalClusterPerClass(OHazelcastPlugin.java:1624)
    ... 12 more
Caused by: java.lang.NullPointerException
    at com.orientechnologies.orient.core.storage.impl.local.paginated.atomicoperations.OAtomicOperationsManager.endAtomicOperation(OAtomicOperationsManager.java:148)
    at com.orientechnologies.orient.core.storage.impl.local.OAbstractPaginatedStorage.doUpdateRecord(OAbstractPaginatedStorage.java:2046)
    at com.orientechnologies.orient.core.storage.impl.local.OAbstractPaginatedStorage.updateRecord(OAbstractPaginatedStorage.java:971)
    at com.orientechnologies.orient.server.distributed.ODistributedStorage.updateRecord(ODistributedStorage.java:708)
    at com.orientechnologies.orient.core.db.document.ODatabaseDocumentTx.executeSaveRecord(ODatabaseDocumentTx.java:2005)
    ... 25 more

2016-01-28 14:00:01:398 INFO  [10.0.9.105]:2434 [orientdb] [3.5.3] Address[10.0.9.105]:2434 is SHUTTING_DOWN [LifecycleService]
2016-01-28 14:00:01:398 WARNI [10.0.9.105]:2434 [orientdb] [3.5.3] Terminating forcefully... [Node]
2016-01-28 14:00:01:399 INFO  [10.0.9.105]:2434 [orientdb] [3.5.3] Shutting down connection manager... [Node]

Answer 1

tl;dr 的严重案例代表。 Orientdb 中关于分布式架构的文档明确指出“在自动创建集群时，在多个节点上创建数据库可能会导致同步问题。请先创建数据库以在分布式模式下运行”，但我没有读到那么远。

根据文档，建议的解决方案似乎是“分区图”（此处描述为 http://orientdb.com/docs/2.0/orientdb.wiki/Partitioned-Graphs.html）。该解决方案并不能真正解决我们所有的担忧，但在理论上已经足够好了。

但是，实际上这不起作用，它需要大量重写，因为需要以不同的方式管理事务。更多关于这在另一个主题....