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From aengin...@apache.org
Subject [02/23] hadoop git commit: HDFS-12351. Explicitly describe the minimal number of DataNodes required to support an EC policy in EC document.. Contributed by Hanisha Koneru.
Date Thu, 04 Jan 2018 20:25:11 GMT
HDFS-12351. Explicitly describe the minimal number of DataNodes required to support an EC policy
in EC document.. Contributed by Hanisha Koneru.


Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/b4d11337
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/b4d11337
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/b4d11337

Branch: refs/heads/HDFS-7240
Commit: b4d11337c9271f29dd403d2393812f2ab6f35b35
Parents: dfe0cd8
Author: Arpit Agarwal <arp@apache.org>
Authored: Tue Jan 2 12:54:40 2018 -0800
Committer: Arpit Agarwal <arp@apache.org>
Committed: Tue Jan 2 12:54:40 2018 -0800

----------------------------------------------------------------------
 .../hadoop-hdfs/src/site/markdown/HDFSErasureCoding.md           | 4 ++++
 1 file changed, 4 insertions(+)
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http://git-wip-us.apache.org/repos/asf/hadoop/blob/b4d11337/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HDFSErasureCoding.md
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diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HDFSErasureCoding.md b/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HDFSErasureCoding.md
index 4459c94..60fd3ab 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HDFSErasureCoding.md
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HDFSErasureCoding.md
@@ -99,6 +99,10 @@ Deployment
 
   Encoding and decoding work consumes additional CPU on both HDFS clients and DataNodes.
 
+  Erasure coding requires a minimum of as many DataNodes in the cluster as
+  the configured EC stripe width. For EC policy RS (6,3), this means
+  a minimum of 9 DataNodes.
+
   Erasure coded files are also spread across racks for rack fault-tolerance.
   This means that when reading and writing striped files, most operations are off-rack.
   Network bisection bandwidth is thus very important.


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