如何判斷Kinesis碎片的狀態？

Question

有沒有方法可以說明碎片的狀態，無論是OPEN，CLOSED還是EXPIRED？我能夠確定這些信息的唯一方法似乎是試圖在碎片上進行操作。

Answer 1

您可以使用亞馬遜Web服務的Java SDK：https://github.com/aws/aws-sdk-java

有很多的訪問你的資源有用的方法。

編輯：對不起，我誤解了這個問題。您無法直接訪問分片狀態（尚）。但有一個技巧：一個封閉的碎片總是有一個「結束序列號」定義。你可以用這種方法破解。

摘自Javadoc;

公共字符串getEndingSequenceNumber（）

的範圍的結束序列號。處於OPEN狀態的碎片的結束序列號爲null。

http://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/services/kinesis/model/SequenceNumberRange.html#getEndingSequenceNumber()

import com.amazonaws.auth.BasicAWSCredentials; 
import com.amazonaws.services.kinesis.AmazonKinesis; 
import com.amazonaws.services.kinesis.AmazonKinesisClient; 
import com.amazonaws.services.kinesis.model.DescribeStreamRequest; 
import com.amazonaws.services.kinesis.model.DescribeStreamResult; 
import com.amazonaws.services.kinesis.model.ListStreamsResult; 

public class KinesisSandbox { 

    public static void main(String[] args) { 
     try { 
      String amazonKey = "x"; 
      String amazonSecret = "y"; 
      AmazonKinesis client = new AmazonKinesisClient(new BasicAWSCredentials(amazonKey, amazonSecret)); 

      ListStreamsResult listStreamsResult = client.listStreams(); 
      System.out.println("\nlistStreamsResult: " + listStreamsResult); 

      String streamName = listStreamsResult.getStreamNames().get(0); 

      DescribeStreamRequest describeStreamRequest = new DescribeStreamRequest(); 
      describeStreamRequest.setStreamName(streamName); 
      DescribeStreamResult describeStreamResult = client.describeStream(describeStreamRequest); 
      System.out.println("\n describeStreamResult.getStreamDescription().getStreamStatus(): " 
        + describeStreamResult.getStreamDescription().getStreamStatus()); 
       // System.out.println("\ndescribeStreamResult: " + describeStreamResult); 

      List<Shard> shards = describeStreamResult.getStreamDescription().getShards(); 
      for (int i = 0; i < shards.size(); i++) { 
       Shard shard = shards.get(i); 
       if (shard.getSequenceNumberRange().getEndingSequenceNumber() == null) { 
        System.out.println("shard(" + i + "): " + shard.getShardId() + " is OPEN."); 
       } else { 
        System.out.println("shard(" + i + "): " + shard.getShardId() + " is CLOSED."); 
       } 
      } 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
    } 
} 

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您使用的編程語言