Home | About | Sematext search-lucene.com search-hadoop.com
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB
 Search Hadoop and all its subprojects:

Switch to Threaded View
Hadoop >> mail # user >> Hadoop-HBase table hierarchical column scan


Copy link to this message
-
Hadoop-HBase table hierarchical column scan
I am fairly new to the hadoop-hbase environment having started working on
it very recently, so I hope I am wording the question correctly.

I am trying to read data from a hadoop-hbase table which has only one
column family named 'DFLT'. This family contains hierarchical column
qualifiers "/source:int64/name:string". I want to read the name column for
a particular source value, say 10. How can I achieve this using the Scan
class?

I tried setting up the scan object as follows:

...

byte[] family = Bytes.toBytes("DFLT");
byte[] qualifier = Bytes.toBytes("source:name");

Scan scan = new Scan();
scan.addFamily(family, qualifier);

FilterList list = new FilterList(FilterList.Operator.MUST_PASS_ALL);

SingleColumnValueFilter filter = new SingleColumnValueFilter(family,
Bytes.toBytes("source"), CompareFilter.CompareOp.EQUAL, Bytes.toBytes(10));

list.addFilter(filter);

scan.setFilter(list);

...
But I do not get any data back with this setup. I am guessing that I am not
setting up the hierarchical qualifiers correctly. Any and all pointers will
be appreciated.

Thanks, Narlin M.
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB