2 qq626387 qq626387 于 2014.08.15 22:04 提问

hbase 根据时间范围查询设置key

我需要根据时间范围来查询hbase表中的数据,如果rowkey用时间戳当前缀的话插入性能就会慢。我刚怎么样设计表结构?谁能提供一个实现方案吗?

1个回答

zhanglaoshi1
zhanglaoshi1   2014.12.16 19:23

public List getRecentJobs(long time, int num) {
long timestamp = time < 0 ? 0 : TRACE_ROW_KEY_SEED - time;
String keyPrefix = StringUtils.leftPad("" + timestamp, 16, '0');
List list = new ArrayList();
HTableInterface table = null;
try {
table = this.getHTable(TABLE_JOB_TRACE);
byte[] startRow = BytesUtil.toBytes(keyPrefix + "00");
byte[] stopRow = BytesUtil.toBytes("zz");
Scan scan = new Scan(startRow, stopRow);
ResultScanner rs = table.getScanner(scan);

        int i = 0;
        for (Result r : rs) {
            String guid = BytesUtil.toString(r.getRow());
            guid = StringUtils.right(guid, guid.length() - TRACE_ROW_KEY_SEED_LENGTH);
            String correlationId = BytesUtil.toString(r.getValue(CF_INFO, COL_CORRELATIONID));
            String errorMessage = BytesUtil.toString(r.getValue(CF_INFO, COL_ERROR));
            long finishTime = BytesUtil.toLong(r.getValue(CF_INFO, COL_FINISHTIME));
            String name = BytesUtil.toString(r.getValue(CF_INFO, COL_NAME));
            long startTime = BytesUtil.toLong(r.getValue(CF_INFO, COL_STARTTIME));
            int status = BytesUtil.toInt(r.getValue(CF_INFO, COL_STATUS));
            String callbackUrl = BytesUtil.toString(r.getValue(CF_INFO, COL_CALLBACK));
            String task = BytesUtil.toString(r.getValue(CF_INFO, COL_TASK));

            JobInstance instance = new JobInstance();
        instance.setGuid(guid);
            instance.setCorrelationId(correlationId);
            instance.setErrorMessage(errorMessage);
        instance.setFinishTime(finishTime);
            instance.setName(name);
            instance.setStartTime(startTime);
            instance.setStatus(status);
            instance.setCallbackUrl(callbackUrl);
        instance.setTask(task);

            list.add(instance);
            i ++;
            if (i >= num) {
                break;
            }
        }

        return list;
    } catch (IOException e) {
        throw new BeyeException(510, e.getMessage(), e);
    } catch (NullPointerException e) {
        throw new BeyeException(404, e.getMessage(), e);
    } finally {
        try {
            table.close();
        } catch (Exception ex) {
        }
    }
}
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