我用docker在本地部署了單節(jié)點的Cassandra，只暴露了9160端口，但是我啟動Java客戶端時除了連接上127.0.0.1:9160，程序還探測到172.18.0.5（這個地址是隨記生成的，我進入到Cassandra的docker里面，用nodetool status可以看到這個地址）。
docker中的Cassandra版本是 2.1.10
java程序中引用的Cassandra包的版本是2.1.0
異常：
m.p.cassandra.connection.NodeDiscovery : Found a node we don't know about 172.18.0.5(172.18.0.5):9160 for TokenRange TokenRange(start_token:2797529887040935278, end_token:2862413517619411597, endpoints:[172.18.0.5], rpc_endpoints:[172.18.0.5], endpoint_details:[EndpointDetails(host:172.18.0.5, datacenter:datacenter1, rack:rack1)])
m.p.c.connection.HConnectionManager : Transport exception host to HConnectionManager: 172.18.0.5(172.18.0.5):9160
me.prettyprint.hector.api.exceptions.HectorTransportException: Unable to open transport to 172.18.0.5(172.18.0.5):9160 , java.net.SocketTimeoutException: connect timed out
at me.prettyprint.cassandra.connection.client.HThriftClient.open(HThriftClient.java:185)
at me.prettyprint.cassandra.connection.client.HThriftClient.open(HThriftClient.java:40)
at me.prettyprint.cassandra.connection.ConcurrentHClientPool.createClient(ConcurrentHClientPool.java:179)
at me.prettyprint.cassandra.connection.ConcurrentHClientPool.<init>(ConcurrentHClientPool.java:61)
at me.prettyprint.cassandra.connection.LatencyAwareHClientPool.<init>(LatencyAwareHClientPool.java:27)
at me.prettyprint.cassandra.connection.DynamicLoadBalancingPolicy.createConnection(DynamicLoadBalancingPolicy.java:124)
at me.prettyprint.cassandra.connection.HConnectionManager.addCassandraHost(HConnectionManager.java:95)
at me.prettyprint.cassandra.connection.NodeDiscovery.doAddNodes(NodeDiscovery.java:49)
at me.prettyprint.cassandra.connection.NodeAutoDiscoverService.doAddNodes(NodeAutoDiscoverService.java:45)
at me.prettyprint.cassandra.connection.NodeAutoDiscoverService$QueryRing.run(NodeAutoDiscoverService.java:51)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: org.apache.thrift.transport.TTransportException: java.net.SocketTimeoutException: connect timed out
at org.apache.thrift.transport.TSocket.open(TSocket.java:185)
at org.apache.thrift.transport.TFramedTransport.open(TFramedTransport.java:81)
at me.prettyprint.cassandra.connection.client.HThriftClient.open(HThriftClient.java:179)
... 16 common frames omitted
Caused by: java.net.SocketTimeoutException: connect timed out
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at org.apache.thrift.transport.TSocket.open(TSocket.java:180)
... 18 common frames omitted
1 回答
繁華開滿天機
TA貢獻1816條經(jīng)驗 獲得超4個贊
Cassandra的docker中那個隨機生成的ip（172.18.0.5）映射的其實和它內(nèi)部localhost是同一個node，但是從外部的host是只能訪問localhost地址，而訪問不到那個隨機生成的ip（172.18.0.5）地址的，因為localhost地址是做了映射的，那個隨機生成的ip（172.18.0.5）地址是沒有做映射。
所以，我就想如何讓外部的host可以訪問那個隨機生成的ip（172.18.0.5），我想了一會兒之后，發(fā)現(xiàn)這樣比較麻煩，得每次啟動Cassandra的docker之后，手動去改外部的hosts文件。
然后，我想可不可以不隨機生成ip（172.18.0.5），我就找到了Cassandra的CASSANDRA_LISTEN_ADDRESS這個環(huán)境變量，dockerhub上的解釋如下：
This variable is for controlling which IP address to listen for incoming connections on. The default value is auto, which will set the listen_address option in cassandra.yaml to the IP address of the container as it starts. This default should work in most use cases.
大概意思就是不設(shè)置CASSANDRA_LISTEN_ADDRESS變量，就會隨機生成ip（172.18.0.5）。
于是，我就設(shè)置了這個CASSANDRA_LISTEN_ADDRESS變量的值為localhost，然后運行程序也沒有報上面的那個錯誤了。
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