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From Stuti Awasthi <stutiawas...@hcl.com>
Subject Facing issues in rest webservice with Hbase using Ruby
Date Thu, 25 Aug 2011 09:49:34 GMT
Hi friends,

I am stuck with my development as I want my ruby client should interact with REST interface
to connect to Hbase. To attain this I installed sishen-hbase-ruby gem and hbase-ruby gem on
my Ubuntu box.
I tried to query a  table present in Hbase using the following code but it is giving error.

Code snippet :

require 'rubygems'
require 'hbase'

client = HBase::Client.new("http://localhost:8080/")            # this url is the default.
table = client.show_table('userstable')                       # show the meta info of table
users

Error on Console :

/usr/local/lib/ruby/gems/1.9.1/gems/sishen-hbase-ruby-1.0/lib/hbase/operation/table_operation.rb:9:in
`rescue in show_table': Table 'userstable' Not found (HBase::TableNotFoundError)
        from /usr/local/lib/ruby/gems/1.9.1/gems/sishen-hbase-ruby-1.0/lib/hbase/operation/table_operation.rb:5:in
`show_table'
        from /home/hadoop/Hbase_Script/Test.rb:10:in `<main>'

Error in Hbase Rest server logs :

2011-08-25 15:10:56,701 DEBUG org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation:
Cached location for .META.,,1.1028785192 is localhost:36169
2011-08-25 15:10:56,728 DEBUG org.apache.hadoop.hbase.rest.RowResource: GET http://localhost:8080/api/userstable
2011-08-25 15:10:56,762 INFO org.apache.zookeeper.ZooKeeper: Initiating client connection,
connectString=localhost:2181 sessionTimeout=180000 watcher=hconnection
2011-08-25 15:10:56,765 INFO org.apache.zookeeper.ClientCnxn: Opening socket connection to
server localhost/10.33.100.107:2181
2011-08-25 15:10:56,765 INFO org.apache.zookeeper.ClientCnxn: Socket connection established
to localhost/10.33.100.107:2181, initiating session
2011-08-25 15:10:56,778 INFO org.apache.zookeeper.ClientCnxn: Session establishment complete
on server localhost/10.33.100.107:2181, sessionid = 0x131fc710262001f, negotiated timeout
= 40000
2011-08-25 15:10:56,790 DEBUG org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation:
Lookedup root region location, connection=org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation@1acee78;
hsa=localhost:36169
2011-08-25 15:10:56,791 DEBUG org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation:
Cached location for .META.,,1.1028785192 is localhost:36169
2011-08-25 15:10:56,803 WARN org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation:
Encountered problems when prefetch META table:
org.apache.hadoop.hbase.TableNotFoundException: Cannot find row in .META. for table: api,
row=api,,99999999999999
            at org.apache.hadoop.hbase.client.MetaScanner.metaScan(MetaScanner.java:136)
            at org.apache.hadoop.hbase.client.MetaScanner.metaScan(MetaScanner.java:95)
            at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.prefetchRegionCache(HConnectionManager.java:648)
            at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegionInMeta(HConnectionManager.java:702)
            at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:593)
            at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:558)
            at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:172)
........................
2011-08-25 15:10:56,807 ERROR org.mortbay.log: /api/userstable
java.lang.RuntimeException: org.apache.hadoop.hbase.TableNotFoundException: api
            at org.apache.hadoop.hbase.client.HTableFactory.createHTableInterface(HTableFactory.java:38)
            at org.apache.hadoop.hbase.client.HTablePool.createHTable(HTablePool.java:133)
            at org.apache.hadoop.hbase.client.HTablePool.getTable(HTablePool.java:89)
            at org.apache.hadoop.hbase.rest.RowResultGenerator.<init>(RowResultGenerator.java:49)
            at org.apache.hadoop.hbase.rest.ResultGenerator.fromRowSpec(ResultGenerator.java:35)
            at org.apache.hadoop.hbase.rest.RowResource.get(RowResource.java:85)
            at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
................
Caused by: org.apache.hadoop.hbase.TableNotFoundException: api
            at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegionInMeta(HConnectionManager.java:724)
            at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:593)
            at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:558)
            at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:172)
            at org.apache.hadoop.hbase.client.HTableFactory.createHTableInterface(HTableFactory.java:36)
            ... 43 more


I am able to hit http://localhost:8080 from the browser and it gives me all the tables present.I
have no clue why it is adding /api/userstable in the url .

Please tell me how can I resolve it or if there is some other forum to which I can point this
issue.

Thanks

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