Hello, Just want to make sure everyone interested in HDFS dev is aware that HDFS-13671 (Namenode deletes large dir slowly caused by FoldedTreeSet#removeAndGet) will soon to be merged.
The folded tree set data structure introduced in Hadoop 3 has big performance regression when delete files. Since it touches the core of HDFS, I thought it would be a good idea to send out the notice for a broader audience. PR: https://github.com/apache/hadoop/pull/3065
