"*Caused by: java.net.ConnectException: Connection refused"*

*This error indicates the HBase service is unavailable. As you know, Kylin
stores Cube and its metadata in HBase, so making HBase service running is a
prerequisite of starting Kylin.*

Best regards,

Shaofeng Shi 史少锋
Apache Kylin PMC
Email: shaofeng...@apache.org

Apache Kylin FAQ: https://kylin.apache.org/docs/gettingstarted/faq.html
Join Kylin user mail group: user-subscr...@kylin.apache.org
Join Kylin dev mail group: dev-subscr...@kylin.apache.org




Xiaoxiang Yu <x...@apache.org> 于2020年4月16日周四 下午2:35写道:

> Hi friend,
>     I can felt your pain, but please be patient.
>     In my opinion, to make good use of Apache Kylin, or any other complex
> system, some prerequisites should be met. Firstly, I think understanding
> Kylin's overall architecture, some knowledge of analysing
> logs(kylin.log/kylin.out) of Kylin are very important, only in this way you
> can narrow down the problem you faced.  After problem was identified, if
> you have some knowledge of how to manipulate Hadoop components: such as
> Apache HBase, Apache HDFS and Apache Hive, I think you can fix problem
> yourself or ask for assistance from community. Hortonworks have provided
> some documentation which looks good to me(
> https://docs.cloudera.com/HDPDocuments/HDP3/HDP-3.1.0/starting-hive/content/hive_start_a_command_line_query_locally.html),
> maybe you can have a try.
>
>
>     Besides, did you ever try to use docker image to start kylin in one
> command? It will give you a learning env without any Hadoop cluster.  I
> think it works well in my laptop(Macbook Pro,15 inch with the latest Docker
> Desktop installed), here is the link,
> https://hub.docker.com/r/apachekylin/apache-kylin-standalone
>
>
>
>
>
>
>
>
>
>
>
>
>
> --
>
> Best wishes to you !
> From :Xiaoxiang Yu
>
>
>
>
>
> At 2020-04-15 21:46:49, "Phillip Poirier" <phi...@optonline.net> wrote:
> >Not that misery always loves company, but I had the previous Kylin version
> >and was trying to use it with the Hortonworks 2.0 distro, and even though
> I
> >could eventually get the service to start, the UI would never launch.  The
> >few people that responded to me told me to try things I already tried
> (like
> >try a different URL or try using different browsers) and it never worked.
> >As someone who's spent decades working in BI and OLAP (especially in SSAS,
> >Essbase and TM1) I too was very interested in trying Kylin as a big data
> >OLAP option and even took the Udemy course on it.  Unfortunately, I just
> had
> >to sit and watch as the course instructor performed cube-building tasks
> as I
> >was never able to get the UI to launch.
> >
> >
> >
> >If you get a real answer to this issue, I'd like to try again.  I have the
> >Hortonworks 3.0 distro now, and would like to try the new version of
> Kylin,
> >if possible.  If not, I'll take a look at Druid.
> >
> >
> >
> >Good luck.
> >
> >
> >
> >-Phil
> >
> >
> >
> >From: Rubio Piqueras, David [mailto:david.ru...@gft.com]
> >Sent: Tuesday, April 14, 2020 11:58 AM
> >To: dev@kylin.apache.org
> >Subject: Kylin 3.0 - Need some help - Can't open the Kylin UI
> >
> >
> >
> >Hi guys,
> >
> >
> >
> >Just starting using Kylin too which looks so interesting.
> >
> >We downloaded your Kylin 3.0 image version:
> >
> >
> >
> >
> >
> >However, I can't open the Kylin UI anytime I try to open it. Checking the
> >logs, this is what we are seeing:
> >
> >
> >
> >2020-04-14 13:58:23,853 INFO  [main-SendThread(localhost:2181)]
> >zookeeper.ClientCnxn:1235 : Session establishment complete on server
> >localhost/127.0.0.1:2181, sessionid = 0x17178f6fbd6000a, negotiated
> timeout
> >= 40000
> >
> >Exception in thread "main" java.lang.IllegalArgumentException: Failed to
> >find metadata store by url: kylin_metadata@hbase
> >
> >        at
>
> >org.apache.kylin.common.persistence.ResourceStore.createResourceStore(Resour
> >ceStore.java:101)
> >
> >        at
>
> >org.apache.kylin.common.persistence.ResourceStore.getStore(ResourceStore.jav
> >a:113)
> >
> >        at
>
> >org.apache.kylin.rest.service.AclTableMigrationTool.checkIfNeedMigrate(AclTa
> >bleMigrationTool.java:99)
> >
> >        at
>
> >org.apache.kylin.tool.AclTableMigrationCLI.main(AclTableMigrationCLI.java:43
> >)
> >
> >Caused by: java.lang.reflect.InvocationTargetException
> >
> >        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
> >Method)
> >
> >        at
>
> >sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAcces
> >sorImpl.java:62)
> >
> >        at
>
> >sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstruc
> >torAccessorImpl.java:45)
> >
> >        at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
> >
> >        at
>
> >org.apache.kylin.common.persistence.ResourceStore.createResourceStore(Resour
> >ceStore.java:94)
> >
> >        ... 3 more
> >
> >Caused by: org.apache.hadoop.hbase.client.RetriesExhaustedException:
> Failed
> >after attempts=1, exceptions:
> >
> >Tue Apr 14 13:58:24 UTC 2020,
> >RpcRetryingCaller{globalStartTime=1586872703980, pause=100, retries=1},
> >java.net.ConnectException: Connection refused
> >
> >
> >
> >        at
>
> >org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithRetries(RpcRetrying
> >Caller.java:147)
> >
> >        at
>
> >org.apache.hadoop.hbase.client.ResultBoundedCompletionService$QueueingFuture
> >.run(ResultBoundedCompletionService.java:64)
> >
> >        at
>
> >java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:11
> >49)
> >
> >        at
>
> >java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:6
> >24)
> >
> >        at java.lang.Thread.run(Thread.java:748)
> >
> >Caused by: java.net.ConnectException: Connection refused
> >
> >        at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
> >
> >        at
> >sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
> >
> >        at
> >org.apache.hadoop.net
> .SocketIOWithTimeout.connect(SocketIOWithTimeout.java:2
> >06)
> >
> >        at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:529)
> >
> >        at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:493)
> >
> >        at
>
> >org.apache.hadoop.hbase.ipc.RpcClientImpl$Connection.setupConnection(RpcClie
> >ntImpl.java:424)
> >
> >        at
>
> >org.apache.hadoop.hbase.ipc.RpcClientImpl$Connection.setupIOstreams(RpcClien
> >tImpl.java:748)
> >
> >        at
>
> >org.apache.hadoop.hbase.ipc.RpcClientImpl$Connection.writeRequest(RpcClientI
> >mpl.java:920)
> >
> >        at
>
> >org.apache.hadoop.hbase.ipc.RpcClientImpl$Connection.tracedWriteRequest(RpcC
> >lientImpl.java:889)
> >
> >        at
> >org.apache.hadoop.hbase.ipc.RpcClientImpl.call(RpcClientImpl.java:1222)
> >
> >        at
>
> >org.apache.hadoop.hbase.ipc.AbstractRpcClient.callBlockingMethod(AbstractRpc
> >Client.java:213)
> >
> >        at
>
> >org.apache.hadoop.hbase.ipc.AbstractRpcClient$BlockingRpcChannelImplementati
> >on.callBlockingMethod(AbstractRpcClient.java:287)
> >
> >        at
>
> >org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$Blocki
> >ngStub.scan(ClientProtos.java:32651)
> >
> >        at
>
> >org.apache.hadoop.hbase.client.ScannerCallable.openScanner(ScannerCallable.j
> >ava:372)
> >
> >        at
>
> >org.apache.hadoop.hbase.client.ScannerCallable.call(ScannerCallable.java:199
> >)
> >
> >        at
>
> >org.apache.hadoop.hbase.client.ScannerCallable.call(ScannerCallable.java:62)
> >
> >        at
>
> >org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithoutRetries(RpcRetry
> >ingCaller.java:200)
> >
> >        at
>
> >org.apache.hadoop.hbase.client.ScannerCallableWithReplicas$RetryingRPC.call(
> >ScannerCallableWithReplicas.java:346)
> >
> >        at
>
> >org.apache.hadoop.hbase.client.ScannerCallableWithReplicas$RetryingRPC.call(
> >ScannerCallableWithReplicas.java:320)
> >
> >        at
>
> >org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithRetries(RpcRetrying
> >Caller.java:126)
> >
> >        ... 4 more
> >
> >2020-04-14 13:58:24,142 INFO  [close-hbase-conn]
> hbase.HBaseConnection:137 :
> >Closing HBase connections...
> >
> >2020-04-14 13:58:24,143 INFO  [close-hbase-conn]
> >client.ConnectionManager$HConnectionImplementation:1676 : Closing
> zookeeper
> >sessionid=0x17178f6fbd6000a
> >
> >2020-04-14 13:58:24,150 INFO  [close-hbase-conn] zookeeper.ZooKeeper:684 :
> >Session: 0x17178f6fbd6000a closed
> >
> >2020-04-14 13:58:24,150 INFO  [main-EventThread] zookeeper.ClientCnxn:512
> :
> >EventThread shut down
> >
> >ERROR: Unknown error. Please check full log
> >
> >
> >
> >I'm not sure, but my feeling is that there is an error with the HBase or
> >Kafka or Zookeper default configuration that needs some changes from my
> end,
> >but not sure what.
> >
> >
> >
> >Appreciate your help on this,
> >
> >
> >
> >Thanks.
> >
> >David Rubio
> >_______________________________________
> >
> >GFT IT Consulting, S.L.U.
> >Avinguda Oest 48
> >46001 VALENCIA
> >
> >T +34963012486
> >david.ru...@gft.com <mailto:david.ru...@gft.com>
> > <https://www.gft.com/es> www.gft.com/es
> >https://blog.gft.com/es
> > <https://www.twitter.com/gft_es> www.twitter.com/gft_es
> >_______________________________________
> >
>

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