Content-Length 分隔的消息体过早结束

Posted 2023-04-17

【中文标题】Content-Length 分隔的消息体过早结束

【英文标题】：Premature end of Content-Length delimited message body

【发布时间】：2020-09-14 16:35:15

【问题描述】：

我调试了代码，我得到的错误是在obj.close() 语句之后。我只需要 S3 对象的最后修改日期。

AmazonS3 s3 = AmazonS3ClientBuilder
              .standard()
              .withCredentials(new DefaultAWSCredentialsProviderChain())
              .withRegion(Regions.US_EAST_1)
              .build();
    S3Object obj = null;
    try 
        obj = s3.getObject("bucketName","abc/1.txt");
    
        obj.getObjectContent();
        Date date = obj.getObjectMetadata().getLastModified();
    
       System.out.println(date);
    finally 
        if(obj!=null) 
            obj.close();
           
    

错误：

org.apache.http.ConnectionClosedException: Premature end of Content-Length delimited message body (expected: 12; received: 0
    at org.apache.http.impl.io.ContentLengthInputStream.read(ContentLengthInputStream.java:180)
    at org.apache.http.impl.io.ContentLengthInputStream.read(ContentLengthInputStream.java:200)
    at org.apache.http.impl.io.ContentLengthInputStream.close(ContentLengthInputStream.java:103)
    at org.apache.http.impl.execchain.ResponseEntityProxy.streamClosed(ResponseEntityProxy.java:140)
    at org.apache.http.conn.EofSensorInputStream.checkClose(EofSensorInputStream.java:228)
    at org.apache.http.conn.EofSensorInputStream.close(EofSensorInputStream.java:174)
    at com.amazonaws.internal.SdkFilterInputStream.close(SdkFilterInputStream.java:99)
    at com.amazonaws.event.ProgressInputStream.close(ProgressInputStream.java:211)
    at com.amazonaws.util.IOUtils.closeQuietly(IOUtils.java:70)
    at com.amazonaws.services.s3.internal.S3AbortableInputStream.close(S3AbortableInputStream.java:185)
    at com.amazonaws.internal.SdkFilterInputStream.close(SdkFilterInputStream.java:99)
    at com.amazonaws.services.s3.model.S3ObjectInputStream.close(S3ObjectInputStream.java:136)
    at com.amazonaws.internal.SdkFilterInputStream.close(SdkFilterInputStream.java:99)
    at com.amazonaws.internal.SdkFilterInputStream.close(SdkFilterInputStream.java:99)
    at com.amazonaws.event.ProgressInputStream.close(ProgressInputStream.java:211)
    at java.base/java.io.FilterInputStream.close(FilterInputStream.java:180)
    at com.amazonaws.internal.SdkFilterInputStream.close(SdkFilterInputStream.java:99)
    at com.amazonaws.services.s3.model.S3ObjectInputStream.close(S3ObjectInputStream.java:136)
    at com.amazonaws.services.s3.model.S3Object.close(S3Object.java:225)

【问题讨论】：

这也是我日志的一部分：[main] WARN com.amazonaws.services.s3.internal.S3AbortableInputStream - 并非所有字节都从 S3ObjectInputStream 中读取，因此中止 HTTP 连接。这很可能是一个错误，并可能导致次优行为。仅通过远程 GET 请求您需要的字节，或在使用后排空输入流。 21:25:38.161 [main] 调试 org.apache.http.impl.execchain.MainClientExec - 取消请求执行

这种情况有时会发生还是总是会发生？你当时有网络连接吗？

它总是会发生，是的，网络连接在那里

文件有多大？

其实很小，大约 12 个字节

【参考方案1】：

发生这种情况是因为您调用了s3.getObject()，但没有读取它检索到的内容。 SDK 假定如果您检索到对象数据，您就会使用它。

如果您只关心对象元数据，您应该直接在AmazonS3 客户端对象上调用getObjectMetadata()。

【讨论】：

我尝试在 AmazonS3 客户端上直接调用 getObjectMetadata，但由于无法关闭此对象，我想我得到了以下错误日志

！原因：com.amazonaws.SdkClientException：无法执行 HTTP 请求：超时等待来自池的连接！在 com.amazonaws.http.AmazonHttpClient$RequestExecutor.handleRetryableException(AmazonHttpClient.java:1207) ！在 com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeHelper(AmazonHttpClient.java:1153) ！在 com.amazonaws.http.AmazonHttpClient$RequestExecutor.doExecute(AmazonHttpClient.java:802)

！在 com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeWithTimer(AmazonHttpClient.java:770) ！在 com.amazonaws.http.AmazonHttpClient$RequestExecutor.execute(AmazonHttpClient.java:744) ！在 com.amazonaws.http.AmazonHttpClient$RequestExecutor.access$500(AmazonHttpClient.java:704) ！在 com.amazonaws.http.AmazonHttpClient$RequestExecutionBuilderImpl.execute(AmazonHttpClient.java:686) ！在 com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:550)

！在 com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:530) ！在 com.amazonaws.services.s3.AmazonS3Client.invoke(AmazonS3Client.java:5062) ！在 com.amazonaws.services.s3.AmazonS3Client.invoke(AmazonS3Client.java:5008) ！在 com.amazonaws.services.s3.AmazonS3Client.getObjectMetadata(AmazonS3Client.java:1338) ！在 com.amazonaws.services.s3.AmazonS3Client.getObjectMetadata(AmazonS3Client.java:1312) ！在 com.amazonaws.services.s3.AmazonS3Client.doesObjectExist(AmazonS3Client.java:1393)

重启服务器后问题已经消失。直接调用 getObjecMetadata("bucketName, "key") 似乎至少目前有效