svn merge -c 1492062 from trunk for HDFS-4819. Update Snapshot doc to clarify that nested snapshots are not allowed.
git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1492064 13f79535-47bb-0310-9956-ffa450edef68
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@ -860,6 +860,9 @@ Release 2.1.0-beta - UNRELEASED
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HDFS-4873. callGetBlockLocations returns incorrect number of blocks for
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snapshotted files. (jing9)
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HDFS-4819. Update Snapshot doc to clarify that nested snapshots are not
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allowed. (szetszwo)
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Release 2.0.5-alpha - 06/06/2013
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INCOMPATIBLE CHANGES
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@ -70,13 +70,13 @@
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the directory can be neither deleted nor renamed
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before all the snapshots are deleted.
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</p>
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<!--
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<p>
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Nested snapshottable directories are currently not allowed.
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In other words, a directory cannot be set to snapshottable
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if one of its ancestors is a snapshottable directory.
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if one of its ancestors/descendants is a snapshottable directory.
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</p>
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-->
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</subsection>
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<subsection name="Snapshot Paths" id="SnapshotPaths">
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@ -100,7 +100,7 @@
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<source>hdfs dfs -cp /foo/.snapshot/s0/bar /tmp</source></li>
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</ul>
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<p>
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The name ".snapshot" is now a reserved file name in HDFS
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<b>Note</b> that the name ".snapshot" is now a reserved file name in HDFS
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so that users cannot create a file/directory with ".snapshot" as the name.
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If ".snapshot" is used in a previous version of HDFS, it must be renamed before upgrade;
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otherwise, upgrade will fail.
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