Repository: hadoop Updated Branches: refs/heads/trunk 3df61f303 -> 859cab2f2
HDFS-7671. hdfs user guide should point to the common rack awareness doc. Contributed by Kai Sasaki. Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/859cab2f Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/859cab2f Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/859cab2f Branch: refs/heads/trunk Commit: 859cab2f2273f563fd70e3e616758edef91ccf41 Parents: 3df61f3 Author: Akira Ajisaka <aajis...@apache.org> Authored: Wed Apr 1 00:26:16 2015 +0900 Committer: Akira Ajisaka <aajis...@apache.org> Committed: Wed Apr 1 00:26:16 2015 +0900 ---------------------------------------------------------------------- hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt | 3 +++ .../hadoop-hdfs/src/site/markdown/HdfsUserGuide.md | 2 +- 2 files changed, 4 insertions(+), 1 deletion(-) ---------------------------------------------------------------------- http://git-wip-us.apache.org/repos/asf/hadoop/blob/859cab2f/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt ---------------------------------------------------------------------- diff --git a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt index e8075e6..f3537b0 100644 --- a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt +++ b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt @@ -368,6 +368,9 @@ Release 2.8.0 - UNRELEASED HDFS-7944. Minor cleanup of BlockPoolManager#getAllNamenodeThreads. (Arpit Agarwal) + HDFS-7671. hdfs user guide should point to the common rack awareness doc. + (Kai Sasaki via aajisaka) + OPTIMIZATIONS BUG FIXES http://git-wip-us.apache.org/repos/asf/hadoop/blob/859cab2f/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HdfsUserGuide.md ---------------------------------------------------------------------- diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HdfsUserGuide.md b/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HdfsUserGuide.md index 37fa4be..ffd8532 100644 --- a/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HdfsUserGuide.md +++ b/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HdfsUserGuide.md @@ -264,7 +264,7 @@ For command usage, see [balancer](./HDFSCommands.html#balancer). Rack Awareness -------------- -Typically large Hadoop clusters are arranged in racks and network traffic between different nodes with in the same rack is much more desirable than network traffic across the racks. In addition NameNode tries to place replicas of block on multiple racks for improved fault tolerance. Hadoop lets the cluster administrators decide which rack a node belongs to through configuration variable `net.topology.script.file.name`. When this script is configured, each node runs the script to determine its rack id. A default installation assumes all the nodes belong to the same rack. This feature and configuration is further described in PDF attached to [HADOOP-692](https://issues.apache.org/jira/browse/HADOOP-692). +A HDFS cluster can recognize the topology of racks where each nodes are put. It is important to configure this topology in order to optimize the data capacity and usage. For more detail, please check the [rack awareness](../hadoop-common/RackAwareness.html) in common document. Safemode --------
