Storm-HBase is a combination of Storm and HBase. This library will let you use HBase as a spout within Storm.

HBaseSpout is used to continuously read stream data from HBase cluster according to the range of [start_timestamp, stop_timestamp]:

• If start_timestamp is set to 0, HBaseSpout will read data from 3 minutes ago by default; otherwise it will read data from the specified start_timestamp.
• If stop_timestamp is set to 0, HBaseSpout will read data unit now and keep on reading as time goes on by default; otherwise it will read data unit the specified stop_timestamp.

All the configuration options can be found in src/main/resources/storm.properties and src/main/resources/hbase.properties files. You can also custom them or some of them if necessary.

HBaseSpout is based on the following assumptions:

• the rowkey of HBase table consists of [shardingkey, timestamp, ...].
• the shardingkey takes up the 1st byte of rowkey, which means the data partitions number of HBase table and usually is a short type number.
• the timestamp takes up the 2nd to 5th bytes of rowkey, which is an UNIX timestamp in second.

The code implementation of spout: HBaseSpout.java.

The test case of spout: HBaseSpoutTest.java.

How to use HBaseSpout, please refer to: DumpToHBaseTopology.java or OutputTopology.java.

• Yuan Panfeng (@ypf412)