从AWS Lambda向SQS队列发送数据时重置连接

Question

我正在使用AWS SDK for Java，我将数据从AWS Lambda发送到SQS。

我们得到例外：

Caused by: java.net.SocketException: Connection reset
at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:115)
at java.net.SocketOutputStream.write(SocketOutputStream.java:155)
at sun.security.ssl.OutputRecord.writeBuffer(OutputRecord.java:431)
at sun.security.ssl.OutputRecord.write(OutputRecord.java:417)
at sun.security.ssl.SSLSocketImpl.writeRecordInternal(SSLSocketImpl.java:886)
at sun.security.ssl.SSLSocketImpl.writeRecord(SSLSocketImpl.java:857)
at sun.security.ssl.AppOutputStream.write(AppOutputStream.java:123)
at org.apache.http.impl.io.SessionOutputBufferImpl.streamWrite(SessionOutputBufferImpl.java:124)
at org.apache.http.impl.io.SessionOutputBufferImpl.write(SessionOutputBufferImpl.java:160)
at org.apache.http.impl.io.ContentLengthOutputStream.write(ContentLengthOutputStream.java:113)
at org.apache.http.impl.io.ContentLengthOutputStream.write(ContentLengthOutputStream.java:120)
at org.apache.http.entity.StringEntity.writeTo(StringEntity.java:167)
at org.apache.http.impl.DefaultBHttpClientConnection.sendRequestEntity(DefaultBHttpClientConnection.java:156)
at org.apache.http.impl.conn.CPoolProxy.sendRequestEntity(CPoolProxy.java:160)
at org.apache.http.protocol.HttpRequestExecutor.doSendRequest(HttpRequestExecutor.java:238)
at com.amazonaws.http.protocol.SdkHttpRequestExecutor.doSendRequest(SdkHttpRequestExecutor.java:63)
at org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:123)
at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:272)
at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:185)
at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:56)
at com.amazonaws.http.apache.client.impl.SdkHttpClient.execute(SdkHttpClient.java:72)
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeOneRequest(AmazonHttpClient.java:1236)
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeHelper(AmazonHttpClient.java:1056)

码：

 List<SendMessageBatchRequestEntry> sqsList= new LinkedList<SendMessageBatchRequestEntry>();
    int batchId = 0; //To send a unique batchId for each msg in a batch
    for (Metadata metadata: metadataList) {
        String jsonString = new Gson().toJson(metadata);
        sqsList.add(new SendMessageBatchRequestEntry(batchId + "", jsonString));
        batchId++;
    }
    amazonSqs.sendMessageBatch(new SendMessageBatchRequest(queueUrl, sqsList));

背景我们正在尝试做什么：

我们有一个主要的Lambda函数，它可以创建和初始化SQS队列，并包含应该处理的每个记录的详细信息。现在，SQS队列需要设置为从队列创建批量的X个消息，并自动为每个批次调用另一个SQS Lambda函数。

Answer 1

每批邮件的最大邮件数为10.您不能一次用20k填充sqs列表并发送该请求。尝试将其分解为10个。

https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-limits.html#limits-queues

Answer 2

好像你的代码很好，据我记得（我自己已经多次看到这个错误），由于SDK重用HTTP连接的方式，这种情况经常发生在使用SDK时。此错误仅告诉您Lambda，重新安装了HTTP连接，但SDK已经内置了重试失败请求的功能，因此如果您没有在每个请求上看到此错误，那么您应该没问题。

Answer 3

我们可以批量大小为10发送它。工作代码：

List<SendMessageBatchRequestEntry> sqsList= new LinkedList<SendMessageBatchRequestEntry>();
    int batchId = 1; //To send a unique batchId for each msg in a batch
    for (Metadata metadata: metadataList) {
        String jsonString = new Gson().toJson(metadata);
        if (sqsList.size() == 10) {
            amazonSqs.sendMessageBatch(new SendMessageBatchRequest(queueUrl, sqsList));
            sqsList.clear();
        } 
        sqsList.add(new SendMessageBatchRequestEntry(batchId + "", jsonString)); 
        batchId++;
    }
    if(sqsList.size()>0) {
        amazonSqs.sendMessageBatch(new SendMessageBatchRequest(queueUrl, sqsList));
    }