apache
Size based rolling support for file sink
This fixes #FLUME-2856. Also added support use a fixed naming pattern for files. Support for allowing to delete old sink files is also added.
Updated documentation for above mentioned changes.
To support maxHistory feature (i.e. to delete older files) I had to be able to predict file names. I introduced new required property for RollingFileSink called fileName. This is the only backwards incompatible change from end users point of view. I have also made a couple of backwards incompatible changes to PathManager class. However PathManager class is not being used by any class other than RollingFileSink class.
I am open to rewrite some of the changes if people think refactoring will cause any issues.
BTW I don't know if I was supposed to send a pull request of attach patch to the JIRA. It's been more than a month since I have attached patch to the FLUME-2856. I have also sent a couple of message to flume-dev list and tried sending emails to flume a couple of moderators/contributors email addressed documented on the flume's team page, with no avail.
