[2/2] hadoop git commit: HDFS-7964. Add support for async edit logging. Contributed by Daryn Sharp.

HDFS-7964. Add support for async edit logging. Contributed by Daryn Sharp. (cherry picked from commit 2151716832ad14932dd65b1a4e47e64d8d6cd767) Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/3cb7ae11 Tree: http://git-wip-u

[2/2] hadoop git commit: HDFS-7964. Add support for async edit logging. Contributed by Daryn Sharp.

HDFS-7964. Add support for async edit logging. Contributed by Daryn Sharp. Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/21517168 Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/21517168 Diff: http://git-wip-us.ap