Using the Scan API, you can scan key-value pairs from TiKV in a range (from a startKey to an endKey).

    To configure the Scan API to return a limited number of key-value pairs, you can use the limit argument as in the following example code:

    Scan all data

    1. import java.util.List;
    2. import org.tikv.common.TiConfiguration;
    3. import org.tikv.common.TiSession;
    4. import org.tikv.common.key.Key;
    6. import org.tikv.raw.RawKVClient;
    7. import org.tikv.shade.com.google.protobuf.ByteString;
    9. TiConfiguration conf = TiConfiguration.createRawDefault("127.0.0.1:2379");
    10. TiSession session = TiSession.create(conf);
    11. RawKVClient client = session.createRawClient();
    12. // prepare data
    13. String keyPrefix = "p";
    14. for(int i = 1; i <= 9; i ++) {
    15.     for(int j = 1; j <= 9; j ++) {
    16.         client.put(ByteString.copyFromUtf8(keyPrefix + i + j), ByteString.copyFromUtf8("v" + i + j));
    17.     }
    18. }
    20. // scan all data
    22. ByteString endKey = Key.toRawKey(ByteString.copyFromUtf8(keyPrefix + "99")).next().toByteString();
    23. int limit = 4;
    24. while(true) {
    25.     Key maxKey = Key.MIN;
    26.     for (Kvrpcpb.KvPair pair : list) {
    27.         System.out.println(pair);
    28.         Key currentKey = Key.toRawKey(pair.getKey());
    29.         if(currentKey.compareTo(maxKey) > 0) {
    30.             maxKey = currentKey;
    31.         }
    32.     }
    34.     if(list.size() < limit) {
    35.         break;
    36.     }

    To get the example code above, click here.