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From Amandeep Khurana <ama...@gmail.com>
Subject Re: Reading from hbase
Date Fri, 20 Feb 2009 21:42:16 GMT
Figured it out. It was a jre problem. I was using 1.5 whereas this 0.19
hbase version needed 1.6.

Amandeep


Amandeep Khurana
Computer Science Graduate Student
University of California, Santa Cruz


On Fri, Feb 20, 2009 at 1:19 PM, Amandeep Khurana <amansk@gmail.com> wrote:

> I am a new Hbase user and am trying to figure my way around with the
> framework.
>
> I was able to get the cluster going and used map reduce to enter data into
> it. Now, I need to access the table from a java program from a client
> machine. How can I do that? I tried setting the hbase.master value in the
> configuration to the server:port of the hbase master, but that didnt work. I
> added the default.xml and site.xml files as resources in the
> HBaseConfiguration object, that didnt work either.
>
> This is the error I am getting:
>
> Exception in thread "main" java.lang.IllegalStateException
>    at java.nio.charset.CharsetEncoder.encode(libgcj.so.90)
>    at org.apache.hadoop.io.Text.encode(Text.java:388)
>    at org.apache.hadoop.io.Text.encode(Text.java:369)
>    at org.apache.hadoop.io.Text.writeString(Text.java:409)
>    at
> org.apache.hadoop.hbase.io.HbaseObjectWritable.writeObject(HbaseObjectWritable.java:265)
>    at
> org.apache.hadoop.hbase.ipc.HBaseRPC$Invocation.write(HBaseRPC.java:156)
>    at
> org.apache.hadoop.hbase.ipc.HBaseClient$Connection.sendParam(HBaseClient.java:472)
>    at org.apache.hadoop.hbase.ipc.HBaseClient.call(HBaseClient.java:691)
>    at
> org.apache.hadoop.hbase.ipc.HBaseRPC$Invoker.invoke(HBaseRPC.java:321)
>    at $Proxy1.getProtocolVersion(Unknown Source:0)
>    at org.apache.hadoop.hbase.ipc.HBaseRPC.getProxy(HBaseRPC.java:467)
>    at org.apache.hadoop.hbase.ipc.HBaseRPC.getProxy(HBaseRPC.java:443)
>    at org.apache.hadoop.hbase.ipc.HBaseRPC.getProxy(HBaseRPC.java:491)
>    at org.apache.hadoop.hbase.ipc.HBaseRPC.waitForProxy(HBaseRPC.java:407)
>    at
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.getHRegionConnection(HConnectionManager.java:724)
>    at
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRootRegion(HConnectionManager.java:773)
>    at
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:448)
>    at
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:423)
>    at
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegionInMeta(HConnectionManager.java:498)
>    at
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:457)
>    at
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:423)
>    at
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegionInMeta(HConnectionManager.java:498)
>    at
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:461)
>    at
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:423)
>    at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:114)
>    at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:97)
>    at Client.main(Client.java:21)
>
> What am I doing wrong?
>
> Here's my code for accessing the table:
> HBaseConfiguration config = new HBaseConfiguration();
>         config.set("hbase.master", "rndpc0:60000");
> //        config.addResource(new
> Path("/hadoop/install/hbase/conf/hbase-default.xml"));
> //        config.addResource(new
> Path("/hadoop/install/hbase/conf/hbase-site.xml"));
>         HTable table = new HTable(config, "sunm");
>         Cell cell = table.get("842", "disruption:");
>         String valueStr = Bytes.toString(cell.getValue());
>         System.out.println(valueStr);
>
>
> Amandeep
>
>
>
> Amandeep Khurana
> Computer Science Graduate Student
> University of California, Santa Cruz
>

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