w.r.t. the first question, the quoted paragraph came from: HBASE-15332 Document how to take advantage of HDFS-6133 in HBase
On Mon, Mar 6, 2017 at 6:38 PM, Lars George <lars.geo...@gmail.com> wrote: > Hi, > > I am trying to grok what came out of all these issues about the HDFS > balancer and being able to avoid it destroying HBase locality. There > is this https://issues.apache.org/jira/browse/HBASE-13021 from JM, and > the book http://hbase.apache.org/book.html#_hbase_and_hdfs refers to > https://issues.apache.org/jira/browse/HDFS-6133, stating: > > "HDFS-6133 provides the ability to exclude a given directory from the > HDFS load balancer, by setting the dfs.datanode.block-pinning.enabled > property to true in your HDFS configuration and running the following > hdfs command: > > $ sudo -u hdfs hdfs balancer -exclude /hbase" > > I checked the Balancer class in 2.7.2 and it does not have that > support, i.e. being able to exclude a path, it can only exclude hosts. > That is also clear from HDFS-6133, which adds favoured nodes, but not > being able to exclude paths (which would be nice). > > HBASE-13021 mentions that this works in tandem with the HBase favored > node feature, but that makes it much more complicated since you have > to pin individual regions to nodes, instead of doing that wholesale. > > Where does the above in the HBase book come from, and what is the > current state as far as you know? > > Cheers, > Lars >
