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From umamah...@apache.org
Subject hadoop git commit: HDFS-10565: Erasure Coding: Document about the current allowed storage policies for EC Striped mode files
Date Fri, 22 Jul 2016 18:21:46 GMT
Repository: hadoop
Updated Branches:
  refs/heads/branch-3.0.0-alpha1 36e160194 -> 208a738d1


HDFS-10565: Erasure Coding: Document about the current allowed storage policies for EC Striped
mode files

(cherry picked from commit 77ac04efe46e4b374c3c6a20895ab7370b1206d3)


Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/208a738d
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/208a738d
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/208a738d

Branch: refs/heads/branch-3.0.0-alpha1
Commit: 208a738d1f50357c20ae00a04db7648aebd6d419
Parents: 36e1601
Author: Uma Maheswara Rao G <uma.gangumalla@intel.com>
Authored: Fri Jul 22 11:08:20 2016 -0700
Committer: Uma Maheswara Rao G <uma.gangumalla@intel.com>
Committed: Fri Jul 22 11:19:27 2016 -0700

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 .../hadoop-hdfs/src/site/markdown/ArchivalStorage.md             | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
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http://git-wip-us.apache.org/repos/asf/hadoop/blob/208a738d/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/ArchivalStorage.md
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diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/ArchivalStorage.md b/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/ArchivalStorage.md
index 803cc91..31bea7c 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/ArchivalStorage.md
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/ArchivalStorage.md
@@ -81,7 +81,9 @@ The following is a typical storage policy table.
 | 5 | Warm | DISK: 1, ARCHIVE: *n*-1 | ARCHIVE, DISK | ARCHIVE, DISK |
 | 2 | Cold | ARCHIVE: *n* | \<none\> | \<none\> |
 
-Note that the Lazy\_Persist policy is useful only for single replica blocks. For blocks with
more than one replicas, all the replicas will be written to DISK since writing only one of
the replicas to RAM\_DISK does not improve the overall performance.
+Note 1: The Lazy\_Persist policy is useful only for single replica blocks. For blocks with
more than one replicas, all the replicas will be written to DISK since writing only one of
the replicas to RAM\_DISK does not improve the overall performance.
+
+Note 2: For the erasure coded files with striping layout, the suitable storage policies are
All\_SSD, Hot, Cold. So, if user sets the policy for striped EC files other than the mentioned
policies, it will not follow that policy while creating or moving block.
 
 ### Storage Policy Resolution
 


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