[HDFS-6564] Use slf4j instead of common-logging in hdfs-client - ASF JIRA

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Hadoop Flags:

Incompatible change, Reviewed
Release Note:

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Users may need special attention for this change while upgrading to this version. Previously hdfs client was using commons-logging as the logging framework. With this change it will use slf4j framework. For more details about slf4j, please see: http://www.slf4j.org/manual.html. Also, org.apache.hadoop.hdfs.protocol.CachePoolInfo#LOG public static member variable has been removed as it is not used anywhere. Users need to correct their code if any one has a reference to this variable. One can retrieve the named logger via the logging framework of their choice directly like, org.slf4j.Logger LOG = org.slf4j.LoggerFactory.getLogger(org.apache.hadoop.hdfs.protocol.CachePoolInfo.class);

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Users may need special attention for this change while upgrading to this version. Previously hdfs client was using commons-logging as the logging framework. With this change it will use slf4j framework. For more details about slf4j, please see: http://www.slf4j.org/manual.html . Also, org.apache.hadoop.hdfs.protocol.CachePoolInfo#LOG public static member variable has been removed as it is not used anywhere. Users need to correct their code if any one has a reference to this variable. One can retrieve the named logger via the logging framework of their choice directly like, org.slf4j.Logger LOG = org.slf4j.LoggerFactory.getLogger(org.apache.hadoop.hdfs.protocol.CachePoolInfo.class);

hdfs-client should depends on slf4j instead of common-logging.

depends upon

HDFS-6200 Create a separate jar for hdfs-client