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From Marco <marco....@gmail.com>
Subject Cannot connect to Hbase via Java API
Date Tue, 16 Dec 2014 14:19:54 GMT
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

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