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Very often we have to change the logging levels of Impalads and Catalog server for debugging purposes. Currently, there is no way to do that without a restart of the daemons, which is not a viable option in production deployments. This patch addresses this supportability gap by exposing the ability to set dynamic logging levels using a simple web endpoint on Impalad/Catalog/Statestore web pages. This includes setting VLOG levels (equivalent to --v flag) as well as setting log4j levels on the Frontend and the Catalog JVMs. Change-Id: I588418e9bcb0b66d33138baf96207a5a35bfbd63 Reviewed-on: http://gerrit.cloudera.org:8080/5792 Reviewed-by: Bharath Vissapragada <bharathv@cloudera.com> Tested-by: Impala Public Jenkins