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 <[email protected]> Authored: Fri Jul 22 11:08:20 2016 -0700 Committer: Uma Maheswara Rao G <[email protected]> Committed: Fri Jul 22 11:19:27 2016 -0700 ---------------------------------------------------------------------- .../hadoop-hdfs/src/site/markdown/ArchivalStorage.md | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) ---------------------------------------------------------------------- http://git-wip-us.apache.org/repos/asf/hadoop/blob/208a738d/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/ArchivalStorage.md ---------------------------------------------------------------------- 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 --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
