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https://issues.apache.org/jira/browse/HDFS-11189?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15729093#comment-15729093
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Weiwei Yang commented on HDFS-11189:
------------------------------------
Hello [~guadilla]
{{HttpURLConnection}} class has a static method
[setFollowRedirects|https://docs.oracle.com/javase/7/docs/api/java/net/HttpURLConnection.html#setFollowRedirects(boolean)]
sets a global flag, and [setInstanceFollowRedirects
|https://docs.oracle.com/javase/7/docs/api/java/net/HttpURLConnection.html#setInstanceFollowRedirects(boolean)]
is using that as a default value. So it could be possible other libraries
calls {{setFollowRedirects}} that changes the behaviour.
However I just tried to set this value to false and tested open() *2-step-opt*
and getFileBlockLocations() *1-step-opt*,
{code}
HttpURLConnection.setFollowRedirects(false);
WebHdfsFileSystem sw = (WebHdfsFileSystem) FileSystem.get(new URI(uri), conf);
FSDataInputStream in = sw.open(new Path(path));
...
{code}
they both worked fine. What was the error you saw? Can you get this issue
reproduced?
> WebHDFS and FollowRedirects
> ---------------------------
>
> Key: HDFS-11189
> URL: https://issues.apache.org/jira/browse/HDFS-11189
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: webhdfs
> Affects Versions: 2.7.3
> Environment: We are using webhdfs from a j2ee environment with java
> 6. In the web application we have a lot of libraries: spring, jersey,
> jackson...
> Reporter: Oscar Guadilla
> Attachments: WebHdfsFileSystem.java
>
>
> In some cases with simple operations (get file - non two step operation) we
> detect that FollowRedirects flag of http comes as "false" and it makes
> webhdfs crash.
> We don't really know which library change this behavior and it is really
> strange because the change is done directly in the jvm because in other
> wars/ears of the same j2ee server it fails also. If we restart the j2ee
> server it starts working again.
> To fix the problem we changed the WebHdfsFileSystem class adding
> "setInstanceFollowRedirects(true)" in the connection management instead of
> supposing that it should be true and it works fine.
> The same problem arises both in 1.x and 2.x webhdfs. We didn't test in 3.x
> Could you fix it? We did it in our environment but it would fine in it could
> be included in the next releases.
> Thanks in advance,
> Oscar
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