java - HBase countRow Nullpointer异常在validateArgAndGetPB

Question

您好，我正在使用Hbase。
我想计算表的行数，所以我使用了AggregationClient.rowCount()

        Configuration conf = HBaseConfiguration.create();
    AggregationClient aggregationClient = new AggregationClient(conf);
    HTable htable=new HTable(conf,Bytes.toBytes("comment"));
    Scan scan =  new  Scan();
    scan.addFamily(Bytes.toBytes("user"));
    try{
        long  rowCount = aggregationClient.rowCount( htable ,  null , scan);
        System.out.println("Row Count : "+rowCount);

    }catch(Throwable e) {
        e.printStackTrace();
    }

但是我遇到了零点异常

java.lang.NullPointerException at org.apache.hadoop.hbase.client.coprocessor.AggregationClient.validateArgAndGetPB(AggregationClient.java:804) at org.apache.hadoop.hbase.client.coprocessor.AggregationClient.rowCount(AggregationClient.java:306) at com.naver.hbase.Main.countRows(Main.java:131) at com.naver.hbase.Main.main(Main.java:58)

我该如何解决？

Answer 1

好了，rowCount方法需要3个参数

long rowCount(final Table table, final ColumnInterpreter<R, S, P, Q, T> ci, final Scan scan) throws Throwable {

然后哪个

final AggregateRequest requestArg = validateArgAndGetPB(scan, ci, false);

您正在传递 ci = null，问题就在那里