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From vvasu...@apache.org
Subject [36/50] [abbrv] hadoop git commit: HDFS-10565: Erasure Coding: Document about the current allowed storage policies for EC Striped mode files
Date Mon, 25 Jul 2016 17:26:22 GMT
HDFS-10565: Erasure Coding: Document about the current allowed storage policies for EC Striped
mode files


Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/77ac04ef
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/77ac04ef
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/77ac04ef

Branch: refs/heads/YARN-3926
Commit: 77ac04efe46e4b374c3c6a20895ab7370b1206d3
Parents: c60a68c
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 11:08:20 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/77ac04ef/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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