从Spring应用程序连接到Cassandra池的问题

Question

从Spring应用程序连接到Cassandra池的问题

dzi*_*zim 8 java spring cassandra nosql spring-boot

我希望,有人能够提供帮助,因为我目前仍在努力与Cassandra ATM合作.

我的设置:对于开发,我有一个带有两个节点的最小Cassandra 3.0.4集群(一个在我的工作机器上,一个在VM中).通常只有本地的启动并运行.我使用最新的Java驱动程序版本3.0.0连接到池.

我cassandra.yaml含有rpc_address和listen_address各节点的IP地址.种子是我的主要工作机器.

我的问题:从cqlsh(任何时候)和两个节点都运行起来(来自Java),一切正常.但是一旦我停止VM中的那个,我的基于Spring的应用程序就会在启动期间抛出错误:

2016-03-29 09:05:33.515 | INFO  | main                 | com.datastax.driver.core.NettyUtil                          :83    | Did not find Netty's native epoll transport in the classpath, defaulting to NIO.
2016-03-29 09:05:34.147 | INFO  | main                 | com.datastax.driver.core.policies.DCAwareRoundRobinPolicy   :95    | Using data-center name 'datacenter1' for DCAwareRoundRobinPolicy (if this is incorrect, please provide the correct datacenter name with DCAwareRoundRobinPolicy constructor)
2016-03-29 09:05:34.149 | INFO  | main                 | com.datastax.driver.core.Cluster$Manager                    :1475  | New Cassandra host /10.20.30.74:9042 added
2016-03-29 09:05:34.149 | INFO  | main                 | com.datastax.driver.core.Cluster$Manager                    :1475  | New Cassandra host /10.20.30.77:9042 added
2016-03-29 09:05:34.150 | INFO  | main                 | my_company.cassandra.dao.impl.CassandraDaoImpl     :55    | Connected to cluster: TestCaseCluster
2016-03-29 09:05:34.151 | INFO  | main                 | my_company.cassandra.dao.impl.CassandraDaoImpl     :57    | Datacenter: datacenter1; Host: /10.20.30.74; Rack: rack1, State: UP|true
2016-03-29 09:05:34.151 | INFO  | main                 | my_company.cassandra.dao.impl.CassandraDaoImpl     :57    | Datacenter: datacenter1; Host: /10.20.30.77; Rack: rack1, State: UP|true
2016-03-29 09:05:34.220 | WARN  | luster1-nio-worker-2 | com.datastax.driver.core.SessionManager$7                   :378   | Error creating pool to /10.20.30.77:9042
com.datastax.driver.core.exceptions.ConnectionException: [/10.20.30.77] Pool was closed during initialization
    at com.datastax.driver.core.HostConnectionPool$2.onSuccess(HostConnectionPool.java:149) [cassandra-driver-core-3.0.0.jar:?]
    at com.datastax.driver.core.HostConnectionPool$2.onSuccess(HostConnectionPool.java:135) [cassandra-driver-core-3.0.0.jar:?]
    at com.google.common.util.concurrent.Futures$4.run(Futures.java:1181) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.MoreExecutors$SameThreadExecutorService.execute(MoreExecutors.java:297) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.ExecutionList.executeListener(ExecutionList.java:156) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.ExecutionList.execute(ExecutionList.java:145) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.AbstractFuture.set(AbstractFuture.java:185) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.Futures$CombinedFuture.setOneValue(Futures.java:1626) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.Futures$CombinedFuture.access$400(Futures.java:1470) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.Futures$CombinedFuture$2.run(Futures.java:1548) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.MoreExecutors$SameThreadExecutorService.execute(MoreExecutors.java:297) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.ExecutionList.executeListener(ExecutionList.java:156) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.ExecutionList.execute(ExecutionList.java:145) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.AbstractFuture.set(AbstractFuture.java:185) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.Futures$FallbackFuture$1$1.onSuccess(Futures.java:475) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.Futures$4.run(Futures.java:1181) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.MoreExecutors$SameThreadExecutorService.execute(MoreExecutors.java:297) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.Futures$ImmediateFuture.addListener(Futures.java:102) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.Futures.addCallback(Futures.java:1184) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.Futures$FallbackFuture$1.onFailure(Futures.java:472) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.Futures$4.run(Futures.java:1172) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.MoreExecutors$SameThreadExecutorService.execute(MoreExecutors.java:297) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.ExecutionList.executeListener(ExecutionList.java:156) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.ExecutionList.execute(ExecutionList.java:145) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.AbstractFuture.setException(AbstractFuture.java:202) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.Futures$FallbackFuture$1$1.onFailure(Futures.java:483) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.Futures$4.run(Futures.java:1172) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.MoreExecutors$SameThreadExecutorService.execute(MoreExecutors.java:297) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.ExecutionList.executeListener(ExecutionList.java:156) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.ExecutionList.add(ExecutionList.java:101) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.AbstractFuture.addListener(AbstractFuture.java:170) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.Futures.addCallback(Futures.java:1184) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.Futures$FallbackFuture$1.onFailure(Futures.java:472) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.Futures$4.run(Futures.java:1172) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.MoreExecutors$SameThreadExecutorService.execute(MoreExecutors.java:297) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.ExecutionList.executeListener(ExecutionList.java:156) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.ExecutionList.execute(ExecutionList.java:145) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.AbstractFuture.setException(AbstractFuture.java:202) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.Futures$ChainingListenableFuture.run(Futures.java:857) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.MoreExecutors$SameThreadExecutorService.execute(MoreExecutors.java:297) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.ExecutionList.executeListener(ExecutionList.java:156) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.ExecutionList.execute(ExecutionList.java:145) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.AbstractFuture.setException(AbstractFuture.java:202) [guava-16.0.1.jar:?]
    at com.google.common.util.concurrent.SettableFuture.setException(SettableFuture.java:68) [guava-16.0.1.jar:?]
    at com.datastax.driver.core.Connection$1.operationComplete(Connection.java:157) [cassandra-driver-core-3.0.0.jar:?]
    at com.datastax.driver.core.Connection$1.operationComplete(Connection.java:140) [cassandra-driver-core-3.0.0.jar:?]
    at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:680) [netty-common-4.0.33.Final.jar:4.0.33.Final]
    at io.netty.util.concurrent.DefaultPromise.notifyListeners0(DefaultPromise.java:603) [netty-common-4.0.33.Final.jar:4.0.33.Final]
    at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:563) [netty-common-4.0.33.Final.jar:4.0.33.Final]
    at io.netty.util.concurrent.DefaultPromise.tryFailure(DefaultPromise.java:424) [netty-common-4.0.33.Final.jar:4.0.33.Final]
    at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.fulfillConnectPromise(AbstractNioChannel.java:276) [netty-transport-4.0.33.Final.jar:4.0.33.Final]
    at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:292) [netty-transport-4.0.33.Final.jar:4.0.33.Final]
    at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:528) [netty-transport-4.0.33.Final.jar:4.0.33.Final]
    at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468) [netty-transport-4.0.33.Final.jar:4.0.33.Final]
    at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382) [netty-transport-4.0.33.Final.jar:4.0.33.Final]
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354) [netty-transport-4.0.33.Final.jar:4.0.33.Final]
    at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:112) [netty-common-4.0.33.Final.jar:4.0.33.Final]
    at java.lang.Thread.run(Thread.java:745) [?:1.8.0_74]

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在这个例子中,我发现以下行为:

Datacenter: datacenter1; Host: /10.20.30.77; Rack: rack1, State: UP|true

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因为这是提到的VM,实际上是下来的:

Datacenter: datacenter1
=======================
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
--  Address      Load       Tokens       Owns (effective)  Host ID                               Rack
DN  10.20.30.77  89.12 KB   256          100.0%            197f6f0f-b820-4ab8-b7ef-bcc8773a345c  rack1
UN  10.20.30.74  96.26 KB   256          100.0%            db7d053b-f8d1-4a59-9cb2-3abf54b24687  rack1

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根据这段摘录,DN应该表示"向下"和"正常" nodetools status.因此,据我所知,Java驱动程序不会将第二个节点识别为关闭并仍尝试连接到它,因为它位于(可用)节点列表中.

这是一个不兼容的问题,因为驱动程序版本和Cassandra版本的组合？但我想,它们兼容: GitHub上的DataStax Java-Driver文档

如果您需要更多信息,请询问.我会相应地更新这个文本.

感谢致敬.

丹尼尔

edit1:我初始化了一个带有复制类SimpleStrategy和因子3的Keyspace - 我读过一些,这个数字不应该超过节点的数量(我猜它是在文档中的某个地方,但我不再有链接了). ..这可能是个原因吗？

Answer 1

dzi*_*zim 13

一个可怜的,似乎没有人知道这种问题.经过几次尝试和在互联网上搜索(我发现这个特定问题几乎没有)我几乎放弃了这个想法.

但.

然后有两件事引起了我的注意:

我的测试密钥空间的复制因子是3,而我只有两个节点.不太明智.
如果我看到异常,我会看到,这是一个警告,而不是一个致命的错误.

所以呢？

我仍然能够连接到群集并实际查询它,但由于此异常总是太早放弃.

几乎"无所谓".

到目前为止,一切都在运作,我可以进一步发展我的应用程序.除了了解这个高可用性NoSQL数据库以及它与"经典"关系数据库不同之外,即使查询语言有许多相似之处.这是非常好的!

所以:抱歉大惊小怪!

干杯,丹尼尔

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