Sean Busbey created HDFS-8101:
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Summary: DFSConfigKeys pulls in WebHDFS classes at runtime
Key: HDFS-8101
URL: https://issues.apache.org/jira/browse/HDFS-8101
Project: Hadoop HDFS
Issue Type: Improvement
Components: hdfs-client
Affects Versions: 2.7.0
Reporter: Sean Busbey
Assignee: Sean Busbey
Priority: Minor
Previously, all references to DFSConfigKeys in DFSClient were compile time
constants which meant that normal users of DFSClient wouldn't resolve
DFSConfigKeys at run time. As of HDFS-7718, DFSClient has a reference to a
member of DFSConfigKeys that isn't compile time constant
(DFS_CLIENT_KEY_PROVIDER_CACHE_EXPIRY_DEFAULT).
Since the class must be resolved now, this particular member
{code}
public static final String DFS_WEBHDFS_AUTHENTICATION_FILTER_DEFAULT =
AuthFilter.class.getName();
{code}
means that javax.servlet.Filter needs to be on the classpath.
javax-servlet-api is one of the properly listed dependencies for HDFS, however
if we replace {{AuthFilter.class.getName()}} with the equivalent String literal
then downstream folks can avoid including it while maintaining compatibility.
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