Hi, I'm trying to figure out what are more ideal settings for using ext4 on hadoop cluster datanodes. From the hadoop site its recommended nodelalloc option is chosen in the fstab. Is that still a preferred option?
I read elsewhere to disable the ext4 journal, and use data=writeback. http://fenidik.blogspot.com/2010/03/ext4-disable-journal.html Finally, in some slides i read to use dir_index,sparse_super,extent when creating the filesystem, and mount noatime and nodiratime http://www.slideshare.net/leonsp/best-practices-for-deploying-hadoop-biginsights-in-the-cloud
