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* Remove requirement that fair scheduler and Llama conf files be on the classpath if specified as relative paths. Now they can be specified as any relative or absolute path. * Add flags to disable all per-pool max requests limits or mem limits. * Rename RequestPoolUtils to RequestPoolService * Make it more clear RequestPoolService is a singleton by putting it in ExecEnv * FileWatchService: use Executors.newScheduledThreadPool instead of a thread * Moved MEGABYTE (and related constants) to new Constants class (frontend) * Test RequestPoolService: Removed AllocationFileLoaderServiceHelper, replaced with reflection Change-Id: Iadf79cf77a7894a469c3587d0019a6d0bee7e58f Reviewed-on: http://gerrit.ent.cloudera.com:8080/1787 Reviewed-by: Matthew Jacobs <mj@cloudera.com> Tested-by: jenkins (cherry picked from commit b9a167f6fdb4ab2595aca6035e1f9d926b909d94) Reviewed-on: http://gerrit.ent.cloudera.com:8080/1858