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Posted to common-commits@hadoop.apache.org by iw...@apache.org on 2019/01/25 20:35:06 UTC
[hadoop] branch trunk updated: HDFS-12729. Document special paths
in HDFS. Contributed by Masatake Iwasaki.
This is an automated email from the ASF dual-hosted git repository.
iwasakims pushed a commit to branch trunk
in repository https://gitbox.apache.org/repos/asf/hadoop.git
The following commit(s) were added to refs/heads/trunk by this push:
new dc5af4c HDFS-12729. Document special paths in HDFS. Contributed by Masatake Iwasaki.
dc5af4c is described below
commit dc5af4c6b7bdf437713a8c6ca3c535c4b6d6992e
Author: Masatake Iwasaki <iw...@apache.org>
AuthorDate: Sat Jan 26 05:25:42 2019 +0900
HDFS-12729. Document special paths in HDFS. Contributed by Masatake Iwasaki.
---
hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HdfsDesign.md | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HdfsDesign.md b/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HdfsDesign.md
index a0121e9..876f465 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HdfsDesign.md
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HdfsDesign.md
@@ -71,6 +71,11 @@ HDFS supports [user quotas](HdfsQuotaAdminGuide.html) and [access permissions](H
HDFS does not support hard links or soft links.
However, the HDFS architecture does not preclude implementing these features.
+While HDFS follows [naming convention of the FileSystem](../hadoop-common/filesystem/model.html#Paths_and_Path_Elements),
+some paths and names (e.g. `/.reserved` and `.snapshot` ) are reserved.
+Features such as [transparent encryption](TransparentEncryption.html) and
+[snapshot](HdfsSnapshots.html) use reserved paths.
+
The NameNode maintains the file system namespace. Any change to the file system namespace or its properties is recorded by the NameNode. An application can specify the number of replicas of a file that should be maintained by HDFS. The number of copies of a file is called the replication factor of that file. This information is stored by the NameNode.
Data Replication
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