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SpyGlass
========
Cascading and Scalding wrapper for HBase with advanced read features
Building
========
$ mvn clean install -U
Requires Maven 3.x.x
Example
=======
package parallelai.spyglass.hbase.example
import org.apache.hadoop.conf.Configuration
import org.apache.hadoop.hbase.HBaseConfiguration
import org.apache.hadoop.hbase.client.HConnectionManager
import org.apache.hadoop.hbase.client.HTable
import org.apache.hadoop.hbase.util.Bytes
import org.apache.log4j.Level
import org.apache.log4j.Logger
import com.twitter.scalding._
import com.twitter.scalding.Args
import parallelai.spyglass.base.JobBase
import parallelai.spyglass.hbase.HBaseSource
import parallelai.spyglass.hbase.HBaseConstants.SourceMode
class HBaseExample(args: Args) extends JobBase(args) {
val isDebug: Boolean = args("debug").toBoolean
if (isDebug) Logger.getRootLogger().setLevel(Level.DEBUG)
val output = args("output")
println(output)
val jobConf = getJobConf
val quorumNames = "cldmgr.prod.bigdata.bskyb.com:2181"
case class HBaseTableStore(
conf: Configuration,
quorum: String,
tableName: String) {
val tableBytes = Bytes.toBytes(tableName)
val connection = HConnectionManager.getConnection(conf)
val maxThreads = conf.getInt("hbase.htable.threads.max", 1)
conf.set("hbase.zookeeper.quorum", quorumNames);
val htable = new HTable(HBaseConfiguration.create(conf), tableName)
}
val hTableStore = HBaseTableStore(getJobConf, quorumNames, "skybet.test.tbet")
val hbs2 = new HBaseSource(
"table_name",
"quorum_name:2181",
'key,
Array("column_family"),
Array('column_name),
sourceMode = SourceMode.GET_LIST, keyList = List("5003914", "5000687", "5004897"))
.read
.write(Tsv(output.format("get_list")))
val hbs3 = new HBaseSource(
"table_name",
"quorum_name:2181",
'key,
Array("column_family"),
Array('column_name),
sourceMode = SourceMode.SCAN_ALL) //, stopKey = "99460693")
.read
.write(Tsv(output.format("scan_all")))
val hbs4 = new HBaseSource(
"table_name",
"quorum_name:2181",
'key,
Array("column_family"),
Array('column_name),
sourceMode = SourceMode.SCAN_RANGE, stopKey = "5003914")
.read
.write(Tsv(output.format("scan_range_to_end")))
val hbs5 = new HBaseSource(
"table_name",
"quorum_name:2181",
'key,
Array("column_family"),
Array('column_name),
sourceMode = SourceMode.SCAN_RANGE, startKey = "5003914")
.read
.write(Tsv(output.format("scan_range_from_start")))
val hbs6 = new HBaseSource(
"table_name",
"quorum_name:2181",
'key,
Array("column_family"),
Array('column_name),
sourceMode = SourceMode.SCAN_RANGE, startKey = "5003914", stopKey = "5004897")
.read
.write(Tsv(output.format("scan_range_between")))
}
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