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HDFS-7770. Need document for storage type label of data node storage locations under dfs.data.dir. Contributed by Xiaoyu Yao. 

(cherry picked from commit de9404f02f)
(cherry picked from commit fdb886d656)
This commit is contained in:
Akira Ajisaka 2015-04-30 20:12:32 +09:00
parent 9828638fac
commit 185a1ff275
3 changed files with 16 additions and 2 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -16,6 +16,9 @@ Release 2.7.1 - UNRELEASED
HDFS-8204. Mover/Balancer should not schedule two replicas to the same
datanode. (Walter Su via szetszwo)
HDFS-7770. Need document for storage type label of data node storage
locations under dfs.data.dir. (Xiaoyu Yao via aajisaka)
OPTIMIZATIONS
BUG FIXES

7
hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
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@ -430,8 +430,11 @@
<description>Determines where on the local filesystem an DFS data node
should store its blocks. If this is a comma-delimited
list of directories, then data will be stored in all named
directories, typically on different devices.
Directories that do not exist are ignored.
directories, typically on different devices. The directories should be tagged
with corresponding storage types ([SSD]/[DISK]/[ARCHIVE]/[RAM_DISK]) for HDFS
storage policies. The default storage type will be DISK if the directory does
not have a storage type tagged explicitly. Directories that do not exist will
be created if local filesystem permission allows.
</description>
</property>

8
hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/ArchivalStorage.md
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@ -95,6 +95,14 @@ The effective storage policy can be retrieved by the "[`dfsadmin -getStoragePoli
### Configuration
* **dfs.storage.policy.enabled** - for enabling/disabling the storage policy feature. The default value is `true`.
* **dfs.datanode.data.dir** - on each data node, the comma-separated storage locations should be tagged with their storage types. This allows storage policies to place the blocks on different storage types according to policy. For example:
1. A datanode storage location /grid/dn/disk0 on DISK should be configured with `[DISK]file:///grid/dn/disk0`
2. A datanode storage location /grid/dn/ssd0 on SSD can should configured with `[SSD]file:///grid/dn/ssd0`
3. A datanode storage location /grid/dn/archive0 on ARCHIVE should be configured with `[ARCHIVE]file:///grid/dn/archive0`
4. A datanode storage location /grid/dn/ram0 on RAM_DISK should be configured with `[RAM_DISK]file:///grid/dn/ram0`
The default storage type of a datanode storage location will be DISK if it does not have a storage type tagged explicitly.
Mover - A New Data Migration Tool
---------------------------------