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From Marco <marco....@gmail.com>
Subject Re: Cannot connect to Hbase via Java API
Date Tue, 16 Dec 2014 18:29:31 GMT
I tried it also completely without setting the config manually,

so just

 val conf = HBaseConfiguration.create()

directly on the server, where hbase/hadoop etc. is installed. Same
issue....I guess there is no connection issue but an issue with the
region server (?)
Understanding what exactly the exception means would be a first step, I guess.

I've tried Apache Phoenix also and that works so it could not be a
general issue with my Hbase/Hadoop config, I guess.

2014-12-16 17:06 GMT+01:00 Ted Yu <yuzhihong@gmail.com>:
> bq. conf.clear()
>
> Why is the above needed ?
> Try removing it.
>
> Cheers
>
> On Tue, Dec 16, 2014 at 7:57 AM, Marco <marco.frg@gmail.com> wrote:
>>
>> no effect :(
>>
>> 2014-12-16 15:19 GMT+01:00 Marco <marco.frg@gmail.com>:
>> > Hi,
>> >
>> > Hbase is installed correctly and working (hbase shell works fine).
>> >
>> > But I'm not able to use the Java API to connect to an existing Hbase
>> Table:
>> >
>> > <<<
>> > val conf = HBaseConfiguration.create()
>> >
>> > conf.clear()
>> >
>> > conf.set("hbase.zookeeper.quorum", "ip:2181");
>> > conf.set("hbase.zookeeper.property.clientPort", "2181");
>> > conf.set("hbase.zookeeper.dns.nameserver", "ip");
>> > conf.set("hbase.regionserver.port","60020");
>> > conf.set("hbase.master", "ip:60000");
>> >
>> > val hTable = new HTable(conf, "truck_events")
>> >
>> >>>>
>> >
>> > Actually the coding is Scala but I think it is understandable, what I
>> > am trying to achieve. I've tried also to use hbase-site.xml instead of
>> > manually configuring it -  but the result is the same.
>> >
>> > As response I got
>> > 14/12/16 15:10:05 INFO zookeeper.ZooKeeper: Initiating client
>> > connection, connectString=ip:2181 sessionTimeout=30000
>> > watcher=hconnection
>> > 14/12/16 15:10:10 INFO zookeeper.ClientCnxn: Opening socket connection
>> > to server ip:2181. Will not attempt to authenticate using SASL
>> > (unknown error)
>> > 14/12/16 15:10:10 INFO zookeeper.ClientCnxn: Socket connection
>> > established to ip:2181, initiating session
>> > 14/12/16 15:10:10 INFO zookeeper.ClientCnxn: Session establishment
>> > complete on server ip:2181, sessionid = 0x14a53583e080010, negotiated
>> > timeout = 30000
>> >
>> > and then finally after a couple of minutes: (the constructor call of
>> > HTable is hanging)
>> >
>> > [error] (run-main-0)
>> > org.apache.hadoop.hbase.client.NoServerForRegionException: Unable to
>> > find region for truck_events,,99999999999999 after 14 tries.
>> > org.apache.hadoop.hbase.client.NoServerForRegionException: Unable to
>> > find region for truck_events,,99999999999999 after 14 tries.
>> >         at
>> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegionInMeta(HConnectionManager.java:1092)
>> >         at
>> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:997)
>> >         at
>> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegionInMeta(HConnectionManager.java:1099)
>> >         at
>> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:1001)
>> >         at
>> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:958)
>> >         at
>> org.apache.hadoop.hbase.client.HTable.finishSetup(HTable.java:251)
>> >         at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:155)
>> >         at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:129)
>> >         at HbaseConnector$.main(HbaseConnector.scala:18)
>> >         at HbaseConnector.main(HbaseConnector.scala)
>> >         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>> >         at
>> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
>> >         at
>> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>> >         at java.lang.reflect.Method.invoke(Method.java:606)
>> > [trace] Stack trace suppressed: run last compile:run for the full output.
>> > 14/12/16 13:22:15 ERROR zookeeper.ClientCnxn: Event thread exiting due
>> > to interruption
>> > java.lang.InterruptedException
>> >         at
>> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.reportInterruptAfterWait(AbstractQueuedSynchronizer.java:2017)
>> >         at
>> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2052)
>> >         at
>> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
>> >         at
>> org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:491)
>> > 14/12/16 13:22:15 INFO zookeeper.ClientCnxn: EventThread shut down
>> > java.lang.RuntimeException: Nonzero exit code: 1
>> >         at scala.sys.package$.error(package.scala:27)
>> > [trace] Stack trace suppressed: run last compile:run for the full output.
>> > [error] (compile:run) Nonzero exit code: 1
>> > [error] Total time: 1106 s, completed Dec 16, 2014 1:22:15 PM
>> >
>> >
>> > In the RegionServer log, I've seen this:
>> >
>> > 2014-12-16 13:31:34,087 DEBUG [RpcServer.listener,port=60020]
>> > ipc.RpcServer: RpcServer.listener,port=60020: connection from
>> > 10.97.68.159:41772; # active connections: 1
>> > 2014-12-16 13:33:34,220 DEBUG [RpcServer.reader=1,port=60020]
>> > ipc.RpcServer: RpcServer.listener,port=60020: DISCONNECTING client
>> > 10.97.68.159:41772 because read count=-1. Number of active
>> > connections: 1
>> > 2014-12-16 13:36:26,988 DEBUG [LruStats #0] hfile.LruBlockCache:
>> > Total=430.02 KB, free=401.18 MB, max=401.60 MB, blockCount=4,
>> > accesses=28, hits=24, hitRatio=85.71%, , cachingAccesses=28,
>> > cachingHits=24, cachingHitsRatio=85.71%, evictions=269, evicted=0,
>> > evictedPerRun=0.0
>> > 2014-12-16 13:36:34,017 DEBUG [RpcServer.listener,port=60020]
>> > ipc.RpcServer: RpcServer.listener,port=60020: connection from
>> > 10.97.68.159:42728; # active connections: 1
>> > 2014-12-16 13:38:34,112 DEBUG [RpcServer.reader=2,port=60020]
>> > ipc.RpcServer: RpcServer.listener,port=60020: DISCONNECTING client
>> > 10.97.68.159:42728 because read count=-1. Number of active
>> > connections: 1
>> > 2014-12-16 13:41:26,989 DEBUG [LruStats #0] hfile.LruBlockCache:
>> > Total=430.02 KB, free=401.18 MB, max=401.60 MB, blockCount=4,
>> > accesses=30, hits=26, hitRatio=86.67%, , cachingAccesses=30,
>> > cachingHits=26, cachingHitsRatio=86.67%, evictions=299, evicted=0,
>> > evictedPerRun=0.0
>> >
>> > So it connects and disconnects with read count -1 .
>> >
>> > Can anybody help me finding the root cause of this issue ? I've tried
>> > to restart Hbase and so on but with no effect. Hive is also working
>> > fine, just not my coding :(
>> >
>> > Thanks a lot,
>> > Marco
>>
>>
>>
>> --
>> Viele Grüße,
>> Marco
>>



-- 
Viele Grüße,
Marco

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