导致这些解析错误异常的原因在我的 Storm 集群中读取 AWS SQS 队列时

我正在使用 Storm 0.8.1 从 Amazon SQS 队列读取传入消息,并且在执行此操作时收到一致的异常:

2013-12-02 02:21:38 executor [ERROR] 
java.lang.RuntimeException: com.amazonaws.AmazonClientException: Unable to unmarshall response (ParseError at [row,col]:[1,1]
Message: JAXP00010001: The parser has encountered more than "64000" entity expansions in this document; this is the limit imposed by the JDK.)
        at REDACTED.spouts.SqsQueueSpout.handleNextTuple(SqsQueueSpout.java:219)
        at REDACTED.spouts.SqsQueueSpout.nextTuple(SqsQueueSpout.java:88)
        at backtype.storm.daemon.executor$fn__3976$fn__4017$fn__4018.invoke(executor.clj:447)
        at backtype.storm.util$async_loop$fn__465.invoke(util.clj:377)
        at clojure.lang.AFn.run(AFn.java:24)
        at java.lang.Thread.run(Thread.java:701)
Caused by: com.amazonaws.AmazonClientException: Unable to unmarshall response (ParseError at [row,col]:[1,1]
Message: JAXP00010001: The parser has encountered more than "64000" entity expansions in this document; this is the limit imposed by the JDK.)
        at com.amazonaws.http.AmazonHttpClient.handleResponse(AmazonHttpClient.java:524)
        at com.amazonaws.http.AmazonHttpClient.executeHelper(AmazonHttpClient.java:298)
        at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:167)
        at com.amazonaws.services.sqs.AmazonSQSClient.invoke(AmazonSQSClient.java:812)
        at com.amazonaws.services.sqs.AmazonSQSClient.receiveMessage(AmazonSQSClient.java:575)
        at REDACTED.spouts.SqsQueueSpout.handleNextTuple(SqsQueueSpout.java:191)
        ... 5 more
Caused by: javax.xml.stream.XMLStreamException: ParseError at [row,col]:[1,1]
Message: JAXP00010001: The parser has encountered more than "64000" entity expansions in this document; this is the limit imposed by the JDK.
        at com.sun.org.apache.xerces.internal.impl.XMLStreamReaderImpl.setInputSource(XMLStreamReaderImpl.java:219)
        at com.sun.org.apache.xerces.internal.impl.XMLStreamReaderImpl.<init>(XMLStreamReaderImpl.java:189)
        at com.sun.xml.internal.stream.XMLInputFactoryImpl.getXMLStreamReaderImpl(XMLInputFactoryImpl.java:277)
        at com.sun.xml.internal.stream.XMLInputFactoryImpl.createXMLStreamReader(XMLInputFactoryImpl.java:129)
        at com.sun.xml.internal.stream.XMLInputFactoryImpl.createXMLEventReader(XMLInputFactoryImpl.java:78)
        at com.amazonaws.http.StaxResponseHandler.handle(StaxResponseHandler.java:85)
        at com.amazonaws.http.StaxResponseHandler.handle(StaxResponseHandler.java:41)
        at com.amazonaws.http.AmazonHttpClient.handleResponse(AmazonHttpClient.java:503)
        ... 10 more

我已经调试了队列上的数据,一切看起来都很好。我无法弄清楚为什么API的XML响应会导致这些问题。有什么想法吗?


答案 1

在这里回答我自己的问题。

目前在Oracle和OpenJDK的Java中存在一个XML扩展限制处理错误,导致共享计数器在解析多个XML文档时达到默认上限。

  1. https://blogs.oracle.com/joew/entry/jdk_7u45_aws_issue_123
  2. https://bugs.openjdk.java.net/browse/JDK-8028111
  3. https://github.com/aws/aws-sdk-java/issues/123

虽然我认为我们的版本(6b27-1.12.6-1ubuntu0.12.04.4)不受影响,但运行OpenJDK错误报告中给出的示例代码确实验证了我们是否容易受到该错误的影响。

为了解决这个问题,我需要传递给风暴工人。通过将以下内容添加到我的集群中,我能够缓解此问题。jdk.xml.entityExpansionLimit=0storm.yaml

supervisor.childopts: "-Djdk.xml.entityExpansionLimit=0"
worker.childopts: "-Djdk.xml.entityExpansionLimit=0"

我应该指出,这在技术上使您面临拒绝服务攻击,但由于我们的XML文档仅来自SQS,因此我不担心有人伪造恶意的XML来杀死我们的工人。


答案 2

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