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如何实际设置基本的Titan + Rexster + Cassandra?

cassandratitanrexster
12
我正在尝试设置一个完全基本的Titan Rexster Cassandra实例，但我似乎无法破解代码。我已经尝试了很多方法来使其工作，但我似乎无法使其正常工作。无论我读了多少关于它的内容，我都不能正确地设置它。
我的目标是在嵌入式模式下运行一个带有一些索引（包括Elasticsearch）的Titan-Rexster-Cassandra实例。在我下载titan-server-0.4.0并运行bin/titan.sh start命令后，它似乎就是我应该得到的东西。这也启动了服务器。然而：当我尝试向其中添加索引时，什么也没有发生。当我尝试通过RexPro填充它时，没有任何东西被添加。
当我重新启动服务器时，我的图表消失了。当我转到http://localhost:8182/graphs时，它不再在Rexster图表列表中。因此，我的数据似乎不会持久存在，或者至少对于rexster来说会消失。
我感觉我已经尝试了几乎所有可以让它正常工作的方法：
更改.properties以包括搜索索引，例如：storrage.index.search.backend=elasticsearch...
更改.properties文件（所有文件）以使用cassandra、embeddedcassandra和cassandrathrift作为storage.backend
尝试使用此问题中指示的属性启动服务器，以指向特定的配置文件。
我查看了titan.sh文件以了解实际发生了什么，然后去了这些文件指示的配置文件，并检查了那里发生的事情，然后尝试了很多类似上面的东西。
我已经为此苦苦挣扎了一个多星期，甚至两个星期以上，我开始失去信心。我正在考虑回到neo4j，但不幸的是，我真的需要Titan的可扩展性。但是如果我无法使其正常工作，则没有用处。我感觉可能有一些微不足道但基本的事情我还没有弄清楚或者忘记了。
有没有人知道有没有一份指南可以从绝对零开始（例如，启动一个全新的VM之类的），或者接近它，以获取运行带有Elasticsearch索引的Titan-Rexster-Cassandra实例？或者，如果你很棒，提供这样的指南？我感到迷失 :(
关键点：
Ubuntu 12.04（也尝试过13.10。同样的问题）
Titan 0.4.0
目标：获取持久性，在Elasticsearch中索引顶点名称属性，并获取带权重的边缘。

像这样连接 Ruby Rexpro：

require "rexpro" #the "rexpro" gem
rexpro_client = Rexpro::Client.new(host: 'the.ip.of.my.machine.running.rexster', port: 8184)
results = rexpro_client.execute("g.getClass()", graph_name: "graph").results
#=> returns the following: class com.thinkaurelius.titan.graphdb.database.StandardTitanGraph

我遵循的步骤来创建数据库不持久化问题：
  • 在WindowsAzure上：使用名称vmname（或其他名称）创建一个新的小型（1核心，1.75GB RAM）VM，并安装Ubuntu 12.04 LTS。
  • 当VM准备好时，使用SSH登录到此VM（ssh azureuser@vmname.cloudhost.net -p 22）
  • 运行：sudo apt-get update
  • 运行：sudo apt-get install openjdk-7-jdk openjdk-7-jre p7zip-full
  • 运行：mkdir /home/azureuser/Downloads
  • 运行：wget -O /home/azureuser/Downloads/titan-server-0.4.0.zip "http://s3.thinkaurelius.com/downloads/titan/titan-server-0.4.0.zip"
  • 运行：cd /home/azureuser/Downloads/
  • 运行：7z x titan-server-0.4.0.zip
  • 运行：cd /home/azureuser/Downloads/titan-server-0.4.0
  • 运行：sudo bin/titan.sh -c cassandra-es start
  • 运行：sudo bin/rexster-console.sh
  • 在rexster控制台中，运行：g = rexster.getGraph("graph")，返回titangraph[cassandra:null]
  • 按CTRL-C退出rexster consloe
  • 运行：sudo bin/titan.sh stop
  • 运行：sudo bin/titan.sh -c cassandra-es start
  • 运行：sudo bin/rexster-console.sh
  • 在rexster控制台中，运行：g = rexster.getGraph("graph")。现在返回null而不是一个图。

关闭和重新启动时似乎存在一些问题：

关闭时

[WARN] ShutdownManager - ShutdownListener JVM Shutdown Hook Remover threw an exception, continuing with shutdown

启动 #2

Starting Cassandra...
xss =  -Dtitan.logdir=/home/azureuser/Downloads/titan-server-0.4.0/log -ea -javaagent:/home/azureuser/Downloads/titan-server-0.4.0/lib/jamm-0.2.5.jar -XX:+UseThreadPriorities -XX:ThreadPriorityPolicy=42 -Xms840M -Xmx840M -Xmn100M -XX:+HeapDumpOnOutOfMemoryError -Xss256k
Starting Titan + Rexster...
 INFO 12:00:12,780 Logging initialized
 INFO 12:00:12,805 JVM vendor/version: OpenJDK 64-Bit Server VM/1.7.0_25
 INFO 12:00:12,806 Heap size: 870318080/870318080
 INFO 12:00:12,806 Classpath: /home/azureuser/Downloads/titan-server-0.4.0/conf:/home/azureuser/Downloads/titan-server-0.4.0/build/classes/main:/home/azureuser/Downloads/titan-server-0.4.0/build/classes/thrift:/home/azureuser/Downloads/titan-server-0.4.0/lib/activation-...
 INFO 12:00:13,397 JNA mlockall successful
 INFO 12:00:13,419 Loading settings from file:/home/azureuser/Downloads/titan-server-0.4.0/conf/cassandra.yaml
 INFO 12:00:14,093 DiskAccessMode 'auto' determined to be mmap, indexAccessMode is mmap
 INFO 12:00:14,093 disk_failure_policy is stop
 INFO 12:00:14,101 Global memtable threshold is enabled at 276MB
 INFO 12:00:14,878 Initializing key cache with capacity of 41 MBs.
 INFO 12:00:14,892 Scheduling key cache save to each 14400 seconds (going to save all keys).
 INFO 12:00:14,894 Initializing row cache with capacity of 0 MBs and provider org.apache.cassandra.cache.SerializingCacheProvider
 INFO 12:00:14,955 Scheduling row cache save to each 0 seconds (going to save all keys).
 INFO 12:00:15,273 Opening db/cassandra/data/system/schema_keyspaces/system-schema_keyspaces-ib-2 (167 bytes)
 INFO 12:00:15,347 Opening db/cassandra/data/system/schema_keyspaces/system-schema_keyspaces-ib-1 (264 bytes)
 INFO 12:00:15,376 Opening db/cassandra/data/system/schema_columnfamilies/system-schema_columnfamilies-ib-11 (717 bytes)
 INFO 12:00:15,387 Opening db/cassandra/data/system/schema_columnfamilies/system-schema_columnfamilies-ib-9 (6183 bytes)
 INFO 12:00:15,392 Opening db/cassandra/data/system/schema_columnfamilies/system-schema_columnfamilies-ib-10 (687 bytes)
 INFO 12:00:15,411 Opening db/cassandra/data/system/schema_columns/system-schema_columns-ib-2 (209 bytes)
 INFO 12:00:15,416 Opening db/cassandra/data/system/schema_columns/system-schema_columns-ib-1 (3771 bytes)
 INFO 12:00:15,450 Opening db/cassandra/data/system/local/system-local-ib-3 (109 bytes)
 INFO 12:00:15,455 Opening db/cassandra/data/system/local/system-local-ib-2 (120 bytes)
 INFO 12:00:15,521 Opening db/cassandra/data/system/local/system-local-ib-1 (356 bytes)
Processes forked.  Setup may take some time.
Run bin/rexster-console.sh to connect.
azureuser@neugle:~/Downloads/titan-server-0.4.0$  INFO 12:00:16,705 completed pre-loading (8 keys) key cache.
 INFO 12:00:16,777 Replaying db/cassandra/commitlog/CommitLog-2-1383479792488.log, db/cassandra/commitlog/CommitLog-2-1383479792489.log
 INFO 12:00:16,802 Replaying db/cassandra/commitlog/CommitLog-2-1383479792488.log
 INFO 12:00:17,178 Finished reading db/cassandra/commitlog/CommitLog-2-1383479792488.log
 INFO 12:00:17,179 Replaying db/cassandra/commitlog/CommitLog-2-1383479792489.log
 INFO 12:00:17,179 Finished reading db/cassandra/commitlog/CommitLog-2-1383479792489.log
 INFO 12:00:17,191 Enqueuing flush of Memtable-local@1221155490(52/52 serialized/live bytes, 22 ops)
 INFO 12:00:17,194 Writing Memtable-local@1221155490(52/52 serialized/live bytes, 22 ops)
 INFO 12:00:17,204 Enqueuing flush of Memtable-users@1341189399(28/28 serialized/live bytes, 2 ops)
 INFO 12:00:17,211 Enqueuing flush of Memtable-system_properties@1057472358(26/26 serialized/live bytes, 1 ops)
 INFO 12:00:17,416 Completed flushing db/cassandra/data/system/local/system-local-ib-4-Data.db (84 bytes) for commitlog position ReplayPosition(segmentId=1383480016398, position=142)
 INFO 12:00:17,480 Writing Memtable-users@1341189399(28/28 serialized/live bytes, 2 ops)
 INFO 12:00:17,626 Completed flushing db/cassandra/data/system_auth/users/system_auth-users-ib-1-Data.db (64 bytes) for commitlog position ReplayPosition(segmentId=1383480016398, position=142)
 INFO 12:00:17,630 Writing Memtable-system_properties@1057472358(26/26 serialized/live bytes, 1 ops)
 INFO 12:00:17,776 Completed flushing db/cassandra/data/titan/system_properties/titan-system_properties-ib-1-Data.db (64 bytes) for commitlog position ReplayPosition(segmentId=1383480016398, position=142)
 INFO 12:00:17,780 Log replay complete, 12 replayed mutations
 INFO 12:00:17,787 Fixing timestamps of schema ColumnFamily schema_keyspaces...
 INFO 12:00:17,864 Enqueuing flush of Memtable-local@1592659210(65/65 serialized/live bytes, 2 ops)
 INFO 12:00:17,872 Writing Memtable-local@1592659210(65/65 serialized/live bytes, 2 ops)
[INFO] Application - .:Welcome to Rexster:.
 INFO 12:00:18,027 Completed flushing db/cassandra/data/system/local/system-local-ib-5-Data.db (97 bytes) for commitlog position ReplayPosition(segmentId=1383480016398, position=297)
 INFO 12:00:18,036 Enqueuing flush of Memtable-schema_keyspaces@1453195003(527/527 serialized/live bytes, 12 ops)
 INFO 12:00:18,038 Writing Memtable-schema_keyspaces@1453195003(527/527 serialized/live bytes, 12 ops)
[INFO] RexsterProperties - Using [/home/azureuser/Downloads/titan-server-0.4.0/conf/rexster-cassandra-es.xml] as configuration source.
 INFO 12:00:18,179 Completed flushing db/cassandra/data/system/schema_keyspaces/system-schema_keyspaces-ib-3-Data.db (257 bytes) for commitlog position ReplayPosition(segmentId=1383480016398, position=1227)
[INFO] Application - Rexster is watching [/home/azureuser/Downloads/titan-server-0.4.0/conf/rexster-cassandra-es.xml] for change.
[WARN] AstyanaxStoreManager - Couldn't set custom Thrift Frame Size property, use 'cassandrathrift' instead.
 INFO 12:00:18,904 Cassandra version: 1.2.2
 INFO 12:00:18,906 Thrift API version: 19.35.0
 INFO 12:00:18,906 CQL supported versions: 2.0.0,3.0.1 (default: 3.0.1)
[INFO] ConnectionPoolMBeanManager - Registering mbean: com.netflix.MonitoredResources:type=ASTYANAX,name=ClusterTitanConnectionPool,ServiceType=connectionpool
[INFO] CountingConnectionPoolMonitor - AddHost: 127.0.0.1
 INFO 12:00:19,087 Loading persisted ring state
 INFO 12:00:19,097 Starting up server gossip
 INFO 12:00:19,162 Enqueuing flush of Memtable-local@114523622(251/251 serialized/live bytes, 9 ops)
 INFO 12:00:19,169 Writing Memtable-local@114523622(251/251 serialized/live bytes, 9 ops)
 INFO 12:00:19,314 Completed flushing db/cassandra/data/system/local/system-local-ib-6-Data.db (238 bytes) for commitlog position ReplayPosition(segmentId=1383480016398, position=51470)
 INFO 12:00:19,369 Compacting [SSTableReader(path='db/cassandra/data/system/local/system-local-ib-3-Data.db'), SSTableReader(path='db/cassandra/data/system/local/system-local-ib-2-Data.db'), SSTableReader(path='db/cassandra/data/system/local/system-local-ib-4-Data.db'), SSTableReader(path='db/cassandra/data/system/local/system-local-ib-1-Data.db'), SSTableReader(path='db/cassandra/data/system/local/system-local-ib-6-Data.db'), SSTableReader(path='db/cassandra/data/system/local/system-local-ib-5-Data.db')]
 INFO 12:00:19,479 Starting Messaging Service on port 7000
 INFO 12:00:19,585 Using saved token [7398637255000140098]
 INFO 12:00:19,588 Enqueuing flush of Memtable-local@365797436(84/84 serialized/live bytes, 4 ops)
 INFO 12:00:19,588 Writing Memtable-local@365797436(84/84 serialized/live bytes, 4 ops)
 INFO 12:00:19,666 Compacted 6 sstables to [db/cassandra/data/system/local/system-local-ib-7,].  1,004 bytes to 496 (~49% of original) in 286ms = 0.001654MB/s.  6 total rows, 1 unique.  Row merge counts were {1:0, 2:0, 3:0, 4:0, 5:0, 6:1, }
 INFO 12:00:19,796 Completed flushing db/cassandra/data/system/local/system-local-ib-8-Data.db (120 bytes) for commitlog position ReplayPosition(segmentId=1383480016398, position=51745)
 INFO 12:00:19,810 Enqueuing flush of Memtable-local@1775610672(50/50 serialized/live bytes, 2 ops)
 INFO 12:00:19,812 Writing Memtable-local@1775610672(50/50 serialized/live bytes, 2 ops)
 INFO 12:00:19,967 Completed flushing db/cassandra/data/system/local/system-local-ib-9-Data.db (109 bytes) for commitlog position ReplayPosition(segmentId=1383480016398, position=51919)
 INFO 12:00:20,088 Node localhost/127.0.0.1 state jump to normal
 INFO 12:00:20,108 Startup completed! Now serving reads.
^C
azureuser@neugle:~/Downloads/titan-server-0.4.0$ sudo bin/rexster-console.sh[WARN] GraphConfigurationContainer - Could not load graph graph. Please check the XML configuration.
[WARN] GraphConfigurationContainer - GraphConfiguration could not be found or otherwise instantiated: [com.thinkaurelius.titan.tinkerpop.rexster.TitanGraphConfiguration]. Ensure that it is in Rexster's path.
com.tinkerpop.rexster.config.GraphConfigurationException: GraphConfiguration could not be found or otherwise instantiated: [com.thinkaurelius.titan.tinkerpop.rexster.TitanGraphConfiguration]. Ensure that it is in Rexster's path.
    at com.tinkerpop.rexster.config.GraphConfigurationContainer.getGraphFromConfiguration(GraphConfigurationContainer.java:137)
    at com.tinkerpop.rexster.config.GraphConfigurationContainer.<init>(GraphConfigurationContainer.java:54)
    at com.tinkerpop.rexster.server.XmlRexsterApplication.reconfigure(XmlRexsterApplication.java:99)
    at com.tinkerpop.rexster.server.XmlRexsterApplication.<init>(XmlRexsterApplication.java:47)
    at com.tinkerpop.rexster.Application.<init>(Application.java:96)
    at com.tinkerpop.rexster.Application.main(Application.java:188)
Caused by: java.lang.IllegalArgumentException: Could not instantiate implementation: com.thinkaurelius.titan.diskstorage.cassandra.astyanax.AstyanaxStoreManager
    at com.thinkaurelius.titan.diskstorage.Backend.instantiate(Backend.java:339)
    at com.thinkaurelius.titan.diskstorage.Backend.getImplementationClass(Backend.java:351)
    at com.thinkaurelius.titan.diskstorage.Backend.getStorageManager(Backend.java:294)
    at com.thinkaurelius.titan.diskstorage.Backend.<init>(Backend.java:112)
    at com.thinkaurelius.titan.graphdb.configuration.GraphDatabaseConfiguration.getBackend(GraphDatabaseConfiguration.java:682)
    at com.thinkaurelius.titan.graphdb.database.StandardTitanGraph.<init>(StandardTitanGraph.java:72)
    at com.thinkaurelius.titan.core.TitanFactory.open(TitanFactory.java:40)
    at com.thinkaurelius.titan.tinkerpop.rexster.TitanGraphConfiguration.configureGraphInstance(TitanGraphConfiguration.java:25)
    at com.tinkerpop.rexster.config.GraphConfigurationContainer.getGraphFromConfiguration(GraphConfigurationContainer.java:119)
    ... 5 more
Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
    at com.thinkaurelius.titan.diskstorage.Backend.instantiate(Backend.java:328)
    ... 13 more
Caused by: com.thinkaurelius.titan.diskstorage.TemporaryStorageException: Temporary failure in storage backend
    at com.thinkaurelius.titan.diskstorage.cassandra.astyanax.AstyanaxStoreManager.ensureKeyspaceExists(AstyanaxStoreManager.java:429)
    at com.thinkaurelius.titan.diskstorage.cassandra.astyanax.AstyanaxStoreManager.<init>(AstyanaxStoreManager.java:172)
    ... 18 more
Caused by: com.netflix.astyanax.connectionpool.exceptions.BadRequestException: BadRequestException: [host=127.0.0.1(127.0.0.1):9160, latency=42(60), attempts=1]InvalidRequestException(why:Keyspace names must be case-insensitively unique ("titan" conflicts with "titan"))
    at com.netflix.astyanax.thrift.ThriftConverter.ToConnectionPoolException(ThriftConverter.java:159)
    at com.netflix.astyanax.thrift.AbstractOperationImpl.execute(AbstractOperationImpl.java:65)
    at com.netflix.astyanax.thrift.AbstractOperationImpl.execute(AbstractOperationImpl.java:28)
    at com.netflix.astyanax.thrift.ThriftSyncConnectionFactoryImpl$ThriftConnection.execute(ThriftSyncConnectionFactoryImpl.java:151)
    at com.netflix.astyanax.connectionpool.impl.AbstractExecuteWithFailoverImpl.tryOperation(AbstractExecuteWithFailoverImpl.java:69)
    at com.netflix.astyanax.connectionpool.impl.AbstractHostPartitionConnectionPool.executeWithFailover(AbstractHostPartitionConnectionPool.java:256)
    at com.netflix.astyanax.thrift.ThriftClusterImpl.executeSchemaChangeOperation(ThriftClusterImpl.java:146)
    at com.netflix.astyanax.thrift.ThriftClusterImpl.addKeyspace(ThriftClusterImpl.java:246)
    at com.thinkaurelius.titan.diskstorage.cassandra.astyanax.AstyanaxStoreManager.ensureKeyspaceExists(AstyanaxStoreManager.java:424)
    ... 19 more
Caused by: InvalidRequestException(why:Keyspace names must be case-insensitively unique ("titan" conflicts with "titan"))
    at org.apache.cassandra.thrift.Cassandra$system_add_keyspace_result.read(Cassandra.java:33158)
    at org.apache.thrift.TServiceClient.receiveBase(TServiceClient.java:78)
    at org.apache.cassandra.thrift.Cassandra$Client.recv_system_add_keyspace(Cassandra.java:1408)
    at org.apache.cassandra.thrift.Cassandra$Client.system_add_keyspace(Cassandra.java:1395)
    at com.netflix.astyanax.thrift.ThriftClusterImpl$9.internalExecute(ThriftClusterImpl.java:250)
    at com.netflix.astyanax.thrift.ThriftClusterImpl$9.internalExecute(ThriftClusterImpl.java:247)
    at com.netflix.astyanax.thrift.AbstractOperationImpl.execute(AbstractOperationImpl.java:60)
    ... 26 more
[WARN] GraphConfigurationContainer - Could not instantiate implementation: com.thinkaurelius.titan.diskstorage.cassandra.astyanax.AstyanaxStoreManager
java.lang.IllegalArgumentException: Could not instantiate implementation: com.thinkaurelius.titan.diskstorage.cassandra.astyanax.AstyanaxStoreManager
    at com.thinkaurelius.titan.diskstorage.Backend.instantiate(Backend.java:339)
    at com.thinkaurelius.titan.diskstorage.Backend.getImplementationClass(Backend.java:351)
    at com.thinkaurelius.titan.diskstorage.Backend.getStorageManager(Backend.java:294)
    at com.thinkaurelius.titan.diskstorage.Backend.<init>(Backend.java:112)
    at com.thinkaurelius.titan.graphdb.configuration.GraphDatabaseConfiguration.getBackend(GraphDatabaseConfiguration.java:682)
    at com.thinkaurelius.titan.graphdb.database.StandardTitanGraph.<init>(StandardTitanGraph.java:72)
    at com.thinkaurelius.titan.core.TitanFactory.open(TitanFactory.java:40)
    at com.thinkaurelius.titan.tinkerpop.rexster.TitanGraphConfiguration.configureGraphInstance(TitanGraphConfiguration.java:25)
    at com.tinkerpop.rexster.config.GraphConfigurationContainer.getGraphFromConfiguration(GraphConfigurationContainer.java:119)
    at com.tinkerpop.rexster.config.GraphConfigurationContainer.<init>(GraphConfigurationContainer.java:54)
    at com.tinkerpop.rexster.server.XmlRexsterApplication.reconfigure(XmlRexsterApplication.java:99)
    at com.tinkerpop.rexster.server.XmlRexsterApplication.<init>(XmlRexsterApplication.java:47)
    at com.tinkerpop.rexster.Application.<init>(Application.java:96)
    at com.tinkerpop.rexster.Application.main(Application.java:188)
Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
    at com.thinkaurelius.titan.diskstorage.Backend.instantiate(Backend.java:328)
    ... 13 more
Caused by: com.thinkaurelius.titan.diskstorage.TemporaryStorageException: Temporary failure in storage backend
    at com.thinkaurelius.titan.diskstorage.cassandra.astyanax.AstyanaxStoreManager.ensureKeyspaceExists(AstyanaxStoreManager.java:429)
    at com.thinkaurelius.titan.diskstorage.cassandra.astyanax.AstyanaxStoreManager.<init>(AstyanaxStoreManager.java:172)
    ... 18 more
Caused by: com.netflix.astyanax.connectionpool.exceptions.BadRequestException: BadRequestException: [host=127.0.0.1(127.0.0.1):9160, latency=42(60), attempts=1]InvalidRequestException(why:Keyspace names must be case-insensitively unique ("titan" conflicts with "titan"))
    at com.netflix.astyanax.thrift.ThriftConverter.ToConnectionPoolException(ThriftConverter.java:159)
    at com.netflix.astyanax.thrift.AbstractOperationImpl.execute(AbstractOperationImpl.java:65)
    at com.netflix.astyanax.thrift.AbstractOperationImpl.execute(AbstractOperationImpl.java:28)
    at com.netflix.astyanax.thrift.ThriftSyncConnectionFactoryImpl$ThriftConnection.execute(ThriftSyncConnectionFactoryImpl.java:151)
    at com.netflix.astyanax.connectionpool.impl.AbstractExecuteWithFailoverImpl.tryOperation(AbstractExecuteWithFailoverImpl.java:69)
    at com.netflix.astyanax.connectionpool.impl.AbstractHostPartitionConnectionPool.executeWithFailover(AbstractHostPartitionConnectionPool.java:256)
    at com.netflix.astyanax.thrift.ThriftClusterImpl.executeSchemaChangeOperation(ThriftClusterImpl.java:146)
    at com.netflix.astyanax.thrift.ThriftClusterImpl.addKeyspace(ThriftClusterImpl.java:246)
    at com.thinkaurelius.titan.diskstorage.cassandra.astyanax.AstyanaxStoreManager.ensureKeyspaceExists(AstyanaxStoreManager.java:424)
    ... 19 more
Caused by: InvalidRequestException(why:Keyspace names must be case-insensitively unique ("titan" conflicts with "titan"))
    at org.apache.cassandra.thrift.Cassandra$system_add_keyspace_result.read(Cassandra.java:33158)
    at org.apache.thrift.TServiceClient.receiveBase(TServiceClient.java:78)
    at org.apache.cassandra.thrift.Cassandra$Client.recv_system_add_keyspace(Cassandra.java:1408)
    at org.apache.cassandra.thrift.Cassandra$Client.system_add_keyspace(Cassandra.java:1395)
    at com.netflix.astyanax.thrift.ThriftClusterImpl$9.internalExecute(ThriftClusterImpl.java:250)
    at com.netflix.astyanax.thrift.ThriftClusterImpl$9.internalExecute(ThriftClusterImpl.java:247)
    at com.netflix.astyanax.thrift.AbstractOperationImpl.execute(AbstractOperationImpl.java:60)
    ... 26 more
[INFO] HttpReporterConfig - Configured HTTP Metric Reporter.
[INFO] ConsoleReporterConfig - Configured Console Metric Reporter.
[INFO] HttpRexsterServer - HTTP/REST thread pool configuration: kernal[4 / 4] worker[8 / 8] 
[INFO] HttpRexsterServer - Using org.glassfish.grizzly.strategies.LeaderFollowerNIOStrategy IOStrategy for HTTP/REST.
[INFO] HttpRexsterServer - Rexster Server running on: [http://localhost:8182]
[INFO] RexProRexsterServer - Using org.glassfish.grizzly.strategies.LeaderFollowerNIOStrategy IOStrategy for RexPro.
[INFO] RexProRexsterServer - RexPro thread pool configuration: kernal[4 / 4] worker[8 / 8] 
[INFO] RexProRexsterServer - Rexster configured with no security.
[INFO] RexProRexsterServer - RexPro Server bound to [0.0.0.0:8184]
[INFO] ShutdownManager$ShutdownSocketListener - Bound shutdown socket to /127.0.0.1:8183. Starting listener thread for shutdown requests.
^C
2个回答
8
作为第一条注意事项，embeddedcassandra在Titan 0.4.0中已经不再使用。您可以在这里了解更多信息。在Titan Server 0.4.0分发版中，cassandra和rexster在单独的JVM中运行，并且通常可以直接从分发版运行。
另外请注意，建议通过Gremlin Console直接创建类型/索引。我喜欢在使用TypeMaker时与图表保持“接近”。您可以在这里阅读有关此类生产实现模式的更多信息。
至于您的特定问题，您的问题帮助揭示了文档中的一个漏洞（已经得到修复）。为确保elasticsearch与Titan Server一起启动，请确保执行以下操作：
bin/titan.sh -c cassandra-es start

此时，您可以通过Rexster连接来构建和查询elasticsearch索引。以下是来自Rexster控制台的示例：

rexster[groovy]> g = rexster.getGraph("graph")
==>titangraph[cassandra:null]
rexster[groovy]> g.makeKey("name").dataType(String.class).indexed("search",Vertex.class).make()
==>v[74]
rexster[groovy]> g.commit()
==>null
rexster[groovy]> g.addVertex([name:'marko'])
==>v[4]
rexster[groovy]> g.addVertex([name:'stephen'])
==>v[8]
rexster[groovy]> g.commit()
==>null
rexster[groovy]> g.V.has('name',PREFIX,'mar')
==>v[4]

请注意，以此模式启动Titan服务器时，elasticsearch在嵌入模式下运行到由Rexster启动的Titan实例中，这意味着：
- Elasticsearch将无法从此特定的Titan实例外部访问，即远程连接将不可能 - 因此，如果您尝试通过Titan Gremlin控制台连接，我认为它将无法工作。连接必须通过Rexster运行。
好的，看起来已经开始了。我应该使用什么索引名称？在文档中，它说你可以按照以下方式创建elasticsearch索引：graph.makeKey("reason").dataType(String.class).indexed("search",Vertex.class).indexed("search", Edge.class).make()。当我这样做时，我会收到一个错误提示，我猜这是因为“search”索引不存在（堆栈跟踪不会显示）。我该如何解决这个问题？ - Automatico
你是在哪里尝试创建索引？Rexster控制台吗？ - stephen mallette
我扩展了我的答案以展示索引创建。同样，这里不需要额外的配置...开箱即用。 - stephen mallette
啊..我一直在使用Gremlin控制台和TitanFactory('tmp/titan')。我以为在Rexster中不能这样做。谢谢Stephen！ - Automatico
不好意思打扰您，但还有最后一件事：当我使用bin/titan.sh stop停止服务器，然后使用bin/titan.sh -c cassandra-es start重新启动时，图形就消失了。在rexster控制台中，当我执行g = rexster.getGraph("graoh")时，返回值为null。也许我的设置有问题吗？ - Automatico
显示剩余8条评论
1
也许我来晚了，但我认为其他人来到这个问题时也能受益。
使用此脚本将自动设置嵌入式Cassandra，适用于“Titan 0.5.4 with Hadoop 2”。我没有测试过“titan-0.9.0-M2-hadoop1.zip”，但如果它有效，请告诉我。
该脚本获取当前主机名IP并替换所有相关配置文件中的网络IP设置（Titan目录必须位于：/opt/titan/，请相应更改）。
#!/usr/bin/env bash
cd /tmp
wget http://s3.thinkaurelius.com/downloads/titan/titan-0.5.4-hadoop2.zip -O titan.zip
unzip titan.zip -d /opt/titan

//queries for current hostname ip - check your /etc/hosts file or this possibly won't work
titan_node_ip=$(hostname -i)
#/opt/titan/conf/cassandra.yaml
sed -i 's/seeds:.*$/seeds: "'$titan_node_ip'"/g' /opt/titan/conf/cassandra.yaml
sed -i 's/listen_address:.*$/listen_address: '$titan_node_ip'/g' /opt/titan/conf/cassandra.yaml
sed -i 's/rpc_address:.*/rpc_address: '$titan_node_ip'/g' /opt/titan/conf/cassandra.yaml

#/opt/titan/conf/elasticsearch.yml
sed -i 's/network.host:.*/network.host: '$titan_node_ip'/g' /opt/titan/conf/elasticsearch.yml

#/opt/titan/conf/rexster-cassandra-es.xml
sed -i 's/<base-uri>.*<\/base-uri>/<base-uri>http:\/\/'$titan_node_ip'<\/base-uri>/g' /opt/titan/conf/rexster-cassandra-es.xml
sed -i 's/<storage.hostname>.*<\/storage.hostname>/<storage.hostname>'$titan_node_ip'<\/storage.hostname>/g' /opt/titan/conf/rexster-cassandra-es.xml
sed -i 's/ <index.search.hostname>.*<\/index.search.hostname>/<index.search.hostname>'$titan_node_ip'<\/index.search.hostname>/g' /opt/titan/conf/rexster-cassandra-es.xml

#/opt/titan/conf/titan-cassandra-embedded-es.properties
sed -i 's/storage.backend=.*/storage.backend=embeddedcassandra/g' /opt/titan/conf/titan-cassandra-embedded-es.properties

#/opt/titan/bin/titan.sh
sed -i 's/ELASTICSEARCH_IP:=.*}/ELASTICSEARCH_IP:='$titan_node_ip'}/g' /opt/titan/bin/titan.sh
sed -i 's/REXSTER_IP:=.*}/REXSTER_IP:='$titan_node_ip'}/g' /opt/titan/bin/titan.sh

如果一切正常，您现在应该能够在Cassandra嵌入式模式下成功运行Titan。
/opt/titan/bin/titan.sh start
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