DocumentList API FullTextQuery ServiceException - 未知错误已发生

Question

对于某些查询我收到的 10秒等待响应后，这个ServiceException。

我也直接HTTP试图获取请求和相同的结果。

例：合同％20Colectiv％20de％20Munc％C4％83

1. My code: 

    URL feedUrl = new URL("https://docs.google.com/feeds/default/private/ full/folder%3A" + folderId + "/contents/-/pdf");       
    DocumentQuery query = new DocumentQuery(feedUrl); 
    query.setFullTextQuery(searchText); 
    client.setConnectTimeout(0);// with or without this line I receive the same result (I also put 30000 value - same result) 
    client.setReadTimeout(0);// with or without this line I receive the same result 

    DocumentListFeed feed = client.getFeed(query, DocumentListFeed.class); 


2. This is the stacktrace for the exception that I receive with documentlist api query: 

    com.google.gdata.util.ServiceException: An unknown error has occurred. 
    <errors xmlns='http://schemas.google.com/g/2005'> 
    <error><domain>GData</domain><code>ServiceException</code> 
    <internalReason>An unknown error has occurred</internalReason> 
    </error></errors> 
    at com.google.gdata.client.http.HttpGDataRequest.handleErrorResponse(HttpGDataRequest.java:624) 
    at com.google.gdata.client.http.GoogleGDataRequest.handleErrorResponse(GoogleGDataRequest.java:563) 
    at com.google.gdata.client.http.HttpGDataRequest.checkResponse(HttpGDataRequest.java: 552) 
    at com.google.gdata.client.http.HttpGDataRequest.execute(HttpGDataRequest.java: 530) 
    at com.google.gdata.client.http.GoogleGDataRequest.execute(GoogleGDataRequest.java:535) 
    at com.google.gdata.client.Service.getFeed(Service.java:1135) 
    ... 

3. This is the exception I receive with direct http get request: 

    java.io.IOException: Server returned HTTP response code: 500 for URL: https://docs.google.com/feeds/default/private/full/folder%3[my_folder_doc-id]/contents/-/pdf?q="[query_text]"&max-results=25 
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java: 1436) 
    at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java: 379) 
    at sun.net.www.protocol.https.HttpsURLConnectionImpl.getResponseCode(HttpsURLConnectionImpl.java: 318) 
    at GoogleDocsManager.googleSearch(GoogleDocsManager.java:281) 

其他信息：

1. My folder contains almost 300k files. Could this be the problem? 
2. In ~85% of searches I get the correct response() 
3. In browser the same interogation returns "The server encountered an error. Please try again later", but after refresh works fine. 

谁能帮我得到了这个问题的 “解决方法”？或者如何 避免它？

我张贴了这个问题几个月前就documentlist api group但由于这组是只读的，我不能获得有关这个问题的任何信息。

---

这是500的响应我直接HTTP请求得到（后〜10秒）：

<errors xmlns='http://schemas.google.com/g/2005'> 
    <error> 
     <domain>GData</domain> 
     <code>ServiceException</code> 
     <internalReason>An unknown error has occurred.</internalReason> 
    </error> 
</errors> 

这是代码：

URL feedUrl = new URL("https://docs.google.com/feeds/default/private/full/folder%3A" + folderId + "/contents/-/pdf?max-results=25&q=" + searchText);       

HttpURLConnection copyHttpUrlConn = (HttpURLConnection) feedUrl.openConnection(); 
copyHttpUrlConn.setDoOutput(true); 
copyHttpUrlConn.setRequestMethod("GET");    
copyHttpUrlConn.setRequestProperty("GData-Version", "3.0"); 
copyHttpUrlConn.setRequestProperty("Authorization", "GoogleLogin auth=" + authToken); 
int respCode = copyHttpUrlConn.getResponseCode(); 

System.out.println("Response code: " + respCode); 

InputStreamReader isr = null; 
if(respCode != 200){ 
    isr = new InputStreamReader(copyHttpUrlConn.getErrorStream()); 
} 
else{ 
    isr = new InputStreamReader(copyHttpUrlConn.getInputStream()); 
} 
BufferedReader br = new BufferedReader(isr); 

String line = null; 
while((line = br.readLine()) != null){ 
    System.out.println(line); 
} 

其他最近的查询与问题：

1. title：2012-05“exceptii de neconstitut ionalitate刑法”
2. “litigii德munca”
3. “MOScrăciunSRL”
4. “BIL terenuri SA布加勒斯特”
5. “ordonanta去普拉塔”

Answer 1

正如你可以考虑提取的一种解决方法使用任务队列离线大文档列表，以及序列化要在数据存储中显示的信息。

使用任务队列会给你自动重试，如果有错误，并且最多10分钟的urlfetch和处理期限的最后期限。