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Date: Wed, 14 Jan 2015 14:54:56 +0100
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Subject: Re: Cannot connect to Hbase via Java API
From: Marco <marco.frg@gmail.com>
To: user@hbase.apache.org
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Hi,

the issue was that my Hbase client library did not fit to the server
version. Desperate ;) as I was, I switched on the debug log level and
have seen some messages, telling me that some node @ zookeeper would
be missing but that wouldn't be an error (?)...so that has looked
suspicious to me and I find an info that the protocol client<->server
has changed...then I've realized what the problem might be....

Maybe such incompatibilities could be better expressed in the log , don't k=
now.

Anyways, all is running fine now :)

BR Marco

2014-12-18 20:36 GMT+01:00 Marco <marco.frg@gmail.com>:
> Hi Wilm,
>
> I also think, I'll try it with a hbase standalone install. Also via
> the logging of Apache Phoenix, I see that this framework can without
> any issues use the region server and it's the same hbase-site.xml.,.
>
> Nevertheless, thank you very much for your efforts!!!
>
> Best wishes,
> Marco
>
> 2014-12-18 17:43 GMT+01:00 Wilm Schumacher <wilm.schumacher@gmail.com>:
>> Hi,
>>
>> I just took a look into the hdp 2.2 sandbox, and unfortunately it was a
>> waste of time and I went older ;).
>>
>> At the first boot, without me doing anything in the configs, zookeeper
>> throwed errors at startup and got killed (couldn't connect). However,
>> ignoring this I started hbase, which hdp recommend doing by hand O_o
>> (starting every service one by one). And the shell worked ... at first.
>>
>> Now I wanted to make it working and used a network bridge to ssh to the
>> box (copy jars for test programs etc.). And now hbase services didn't
>> want to start, because now it couldn't access the log files anymore
>> (missing permissions) *scratch at head*. I gave permissions to the hbase
>> user ... didn't work either. HMaster got killed immediately. After using
>> a host-only network ... same problems. I didn't looked further into the
>> problems, as I wanted to take only a small look at the product.
>>
>> After reimporting and a second try ... same problems. So, I couldn't
>> reproduce your problem because I didn't get to your point of problems :(=
.
>>
>> As this is a standard VM thousands of people use the errors are most
>> likely in my install of the VM, but it seems to be very easy to make
>> mistakes and end up with a not usable install :/. Sry that this didn't
>> help. But I think you should use a standard hbase standalone install to
>> test hbase for your purposes.
>>
>> Best wishes and good luck
>>
>> Wilm
>>
>> Am 16.12.2014 um 15:19 schrieb Marco:
>>> 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 Ta=
ble:
>>>
>>> <<<
>>> val conf =3D 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 =3D 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=3Dip:2181 sessionTimeout=3D30000
>>> watcher=3Dhconnection
>>> 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 =3D 0x14a53583e080010, negotiated
>>> timeout =3D 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$HConnectio=
nImplementation.locateRegionInMeta(HConnectionManager.java:1092)
>>>         at org.apache.hadoop.hbase.client.HConnectionManager$HConnectio=
nImplementation.locateRegion(HConnectionManager.java:997)
>>>         at org.apache.hadoop.hbase.client.HConnectionManager$HConnectio=
nImplementation.locateRegionInMeta(HConnectionManager.java:1099)
>>>         at org.apache.hadoop.hbase.client.HConnectionManager$HConnectio=
nImplementation.locateRegion(HConnectionManager.java:1001)
>>>         at org.apache.hadoop.hbase.client.HConnectionManager$HConnectio=
nImplementation.locateRegion(HConnectionManager.java:958)
>>>         at org.apache.hadoop.hbase.client.HTable.finishSetup(HTable.jav=
a:251)
>>>         at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:155=
)
>>>         at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:129=
)
>>>         at HbaseConnector$.main(HbaseConnector.scala:18)
>>>         at HbaseConnector.main(HbaseConnector.scala)
>>>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>>>         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAcce=
ssorImpl.java:57)
>>>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMe=
thodAccessorImpl.java:43)
>>>         at java.lang.reflect.Method.invoke(Method.java:606)
>>> [trace] Stack trace suppressed: run last compile:run for the full outpu=
t.
>>> 14/12/16 13:22:15 ERROR zookeeper.ClientCnxn: Event thread exiting due
>>> to interruption
>>> java.lang.InterruptedException
>>>         at java.util.concurrent.locks.AbstractQueuedSynchronizer$Condit=
ionObject.reportInterruptAfterWait(AbstractQueuedSynchronizer.java:2017)
>>>         at java.util.concurrent.locks.AbstractQueuedSynchronizer$Condit=
ionObject.await(AbstractQueuedSynchronizer.java:2052)
>>>         at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlocking=
Queue.java:442)
>>>         at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.j=
ava:491)
>>> 14/12/16 13:22:15 INFO zookeeper.ClientCnxn: EventThread shut down
>>> java.lang.RuntimeException: Nonzero exit code: 1
>>>         at scala.sys.package$.error(package.scala:27)
>>> [trace] Stack trace suppressed: run last compile:run for the full outpu=
t.
>>> [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=3D60020]
>>> ipc.RpcServer: RpcServer.listener,port=3D60020: connection from
>>> 10.97.68.159:41772; # active connections: 1
>>> 2014-12-16 13:33:34,220 DEBUG [RpcServer.reader=3D1,port=3D60020]
>>> ipc.RpcServer: RpcServer.listener,port=3D60020: DISCONNECTING client
>>> 10.97.68.159:41772 because read count=3D-1. Number of active
>>> connections: 1
>>> 2014-12-16 13:36:26,988 DEBUG [LruStats #0] hfile.LruBlockCache:
>>> Total=3D430.02 KB, free=3D401.18 MB, max=3D401.60 MB, blockCount=3D4,
>>> accesses=3D28, hits=3D24, hitRatio=3D85.71%, , cachingAccesses=3D28,
>>> cachingHits=3D24, cachingHitsRatio=3D85.71%, evictions=3D269, evicted=
=3D0,
>>> evictedPerRun=3D0.0
>>> 2014-12-16 13:36:34,017 DEBUG [RpcServer.listener,port=3D60020]
>>> ipc.RpcServer: RpcServer.listener,port=3D60020: connection from
>>> 10.97.68.159:42728; # active connections: 1
>>> 2014-12-16 13:38:34,112 DEBUG [RpcServer.reader=3D2,port=3D60020]
>>> ipc.RpcServer: RpcServer.listener,port=3D60020: DISCONNECTING client
>>> 10.97.68.159:42728 because read count=3D-1. Number of active
>>> connections: 1
>>> 2014-12-16 13:41:26,989 DEBUG [LruStats #0] hfile.LruBlockCache:
>>> Total=3D430.02 KB, free=3D401.18 MB, max=3D401.60 MB, blockCount=3D4,
>>> accesses=3D30, hits=3D26, hitRatio=3D86.67%, , cachingAccesses=3D30,
>>> cachingHits=3D26, cachingHitsRatio=3D86.67%, evictions=3D299, evicted=
=3D0,
>>> evictedPerRun=3D0.0
>>>
>>> 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 Gr=C3=BC=C3=9Fe,
> Marco


--=20
Viele Gr=C3=BC=C3=9Fe,
Marco