title: Unknown Host exception from the AWS Java client?
body: <p>Has anyone else run across this exception? We saw it during a load test last night. The hostname is correct and normally works fine. It just started throwing this exception last night. Either it was a random DNS fail on amanzon's part or the Aws SDK for Java does something unexpected under load. </p>
  
  <pre><code>&gt; Caused by: java.net.UnknownHostException: sdb.amazonaws.com
      at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
      at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:867)
      at java.net.InetAddress.getAddressFromNameService(InetAddress.java:1246)
      at java.net.InetAddress.getAllByName0(InetAddress.java:1197)
      at java.net.InetAddress.getAllByName(InetAddress.java:1128)
      at java.net.InetAddress.getAllByName(InetAddress.java:1064)
      at org.apache.http.impl.conn.DefaultClientConnectionOperator.resolveHostname(DefaultClientConnectionOperator.java:242)
      at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:130)
      at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:149)
      at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:121)
      at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:561)
      at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:415)
      at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:820)
      at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:754)
      at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:732)
      at com.amazonaws.http.AmazonHttpClient.executeHelper(AmazonHttpClient.java:266)
  </code></pre>