cassandra - 如何实际设置基本的 Titan + Rexster + Cassandra？

Question

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。我现在已经尝试了很多东西来让它工作，但我似乎无法让它工作。无论我读了多少关于它，我都无法正确设置它。

我想要的是一个以嵌入模式运行的 Titan-rexster-cassandra 实例，其中包含一些索引，包括 Elasticsearch 。在我阅读了所有内容之后，当我下载titan-server-0.4.0 并运行bin/titan.sh start 时，这似乎是我应该得到的。命令。这也会启动服务器。但是:当我尝试为此添加索引时，没有任何 react 。当我尝试通过 RexPro 填充它时，没有添加任何内容。

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，我的数据似乎不存在，或者至少对于 rexster 来说消失了。

我觉得我已经尝试了几乎所有方法来让它工作:

更改 .properties像这样包含搜索索引:storrage.index.search.backend=elasticsearch ...

更改 .properties文件(所有这些)使用 cassandra , embeddedcassandra和 cassandrathrift为 storage.backend

尝试使用 this question 中指示的属性启动服务器指向特定的配置文件。

我浏览了titan.sh文件以查看实际发生的情况，然后转到这些指示的配置文件并查看那里发生了什么，我已经尝试了很多事情，例如上述内容。

我已经为此挣扎了一个多星期，可能两个甚至更多，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，如果我不能让它工作，那么它就没有用了。我觉得可能有一些琐碎但必不可少的事情我还没有弄清楚或忘记了。

有没有人知道那里有一个指南可以让您从绝对零开始(例如，启动一个新的 VM 或其他东西)或接近它，让一个带有 Elasticsearch 索引的 Titan-rexster-cassandra 实例运行？或者，如果您很棒，请提供这样的指南？我感到失落 :(

关键点:

Ubuntu 12.04(也试过 13.10。同样的问题)

泰坦 0.4.0

目标:要获得持久性，请使用 Elasticsearch 索引顶点名称属性，并使用权重获取边。

像这样与 ruby​​ rexpro 连接:

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存在的问题:

在 WindowsAzure 上:使用 Ubuntu 12.04 LTS 创建一个新的小型(1 核，1.75GB 内存)VM与姓名 vmname (管他呢)。

准备好后使用 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]

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") . 现在这将返回 null，而不是图形。

关闭并重新启动时，这里似乎存在一些问题:

关闭时

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

在启动 #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

Answer 1

首先，embeddedcassandra在 Titan 0.4.0 中不再是你想要的。您可以阅读更多相关信息 here .在 0.4.0 的 Titan Server 发行版中，cassandra 和 rexster 在单独的 JVM 中运行，并且通常应该从发行版中开箱即用。

另请注意，我会说建议直接通过 Gremlin 控制台创建类型/索引。我喜欢在使用 TypeMaker 时“接近图表” .您可以阅读有关此类生产实现模式的更多信息 here .

至于您的具体问题，您的问题帮助发现了文档中的一个漏洞(此后一直是 remedied )。为确保使用 Titan Server 启动 elasticsearch，请确保您执行以下操作:

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 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]

注意在这种模式下启动 Titan Server，elasticsearch 运行在 embedded mode到 Rexster 启动的 Titan 实例，这意味着:

Elasticsearch will not be accessible from outside of this particular Titan instance, i.e., remote connections will not be possible

因此，如果您尝试通过 Titan Gremlin 控制台进行连接，我不相信它会起作用。连接必须通过 Rexster 运行。