public static void main(String[] args) throws Exception {
if (args.length < 2) {
throw new Exception("Table name not specified.");
}
Configuration conf = HBaseConfiguration.create();
HTable table = new HTable(conf, args[0]);
String startKey = args[1];
TimeCounter executeTimer = new TimeCounter();
executeTimer.begin();
executeTimer.enter();
Expression exp =
ExpressionFactory.eq(
ExpressionFactory.toLong(
ExpressionFactory.toString(ExpressionFactory.columnValue("family", "longStr2"))),
ExpressionFactory.constant(Long.parseLong("99")));
ExpressionFilter expressionFilter = new ExpressionFilter(exp);
Scan scan = new Scan(Bytes.toBytes(startKey), expressionFilter);
int count = 0;
ResultScanner scanner = table.getScanner(scan);
Result r = scanner.next();
while (r != null) {
count++;
r = scanner.next();
}
System.out.println("++ Scanning finished with count : " + count + " ++");
scanner.close();
executeTimer.leave();
executeTimer.end();
System.out.println("++ Time cost for scanning: " + executeTimer.getTimeString() + " ++");
}
public static void main(String[] args) {
Configuration conf = HBaseConfiguration.create();
conf.setInt("hbase.client.retries.number", 1);
conf.setInt("ipc.client.connect.max.retries", 1);
byte[] table = Bytes.toBytes("t");
try {
GroupByClient groupByClient = new GroupByClient(conf);
Scan[] scans = {new Scan()};
List<Expression> groupByExpresstions = new ArrayList<Expression>();
List<Expression> selectExpresstions = new ArrayList<Expression>();
groupByExpresstions.add(ExpressionFactory.columnValue("f", "id"));
selectExpresstions.add(
ExpressionFactory.groupByKey(ExpressionFactory.columnValue("f", "id")));
List<EvaluationResult[]> groupByResultList =
groupByClient.groupBy(table, scans, groupByExpresstions, selectExpresstions, null);
for (EvaluationResult[] res : groupByResultList) {
String resultString = "";
for (int i = 0; i < res.length; i++) {
EvaluationResult er = res[i];
resultString += "\t\t" + er.toString();
if (0 == ((i + 1) % selectExpresstions.size())) {
System.out.println(resultString);
resultString = "";
}
}
}
} catch (Throwable e) {
e.printStackTrace();
}
}