如何判斷Kinesis碎片的狀態？

Question

有沒有辦法告訴碎片的狀態是什么，無論是開放，關閉還是過期？ 我能夠確定此信息的唯一方法似乎是嘗試在分片上進行操作。

Answer 1

您可以使用Amazon Web Services Java SDK： https ： //github.com/aws/aws-sdk-java

有很多有用的方法來訪問您的資源。

編輯：對不起，我誤解了這個問題。 您無法直接訪問分片的狀態（尚未）。 但有一個技巧：一個封閉的分片總是定義一個“結束序列號”。 你可以這樣破解。

摘自Javadoc;

public String getEndingSequenceNumber （）

范圍的結束序列號。 處於OPEN狀態的碎片的結束序列號為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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