13627: Make sure work_api is set on runtimeContext.

[arvados.git] / doc / user / topics / keep.html.textile.liquid

diff --git a/doc/user/topics/keep.html.textile.liquid b/doc/user/topics/keep.html.textile.liquid
index f96642937e4bb84ec6e8dc259c29bc9cdb2fc7de..dd504398e3617902e4cc6455108a2974027e4d8a 100644 (file)
--- a/doc/user/topics/keep.html.textile.liquid
+++ b/doc/user/topics/keep.html.textile.liquid
@@ -3,8 +3,13 @@ layout: default
 navsection: userguide
 title: "How Keep works"
 ...
+{% comment %}
+Copyright (C) The Arvados Authors. All rights reserved.
 
-The Arvados distributed file system is called *Keep*.  Keep is a content-addressable file system.  This means that files are managed using special unique identifiers derived from the _contents_ of the file, rather than human-assigned file names (specifically, the MD5 hash).  This has a number of advantages:
+SPDX-License-Identifier: CC-BY-SA-3.0
+{% endcomment %}
+
+The Arvados distributed file system is called *Keep*.  Keep is a content-addressable file system.  This means that files are managed using special unique identifiers derived from the _contents_ of the file (specifically, the MD5 hash), rather than human-assigned file names.  This has a number of advantages:
 * Files can be stored and replicated across a cluster of servers without requiring a central name server.
 * Both the server and client systematically validate data integrity because the checksum is built into the identifier.
 * Data duplication is minimized—two files with the same contents will have in the same identifier, and will not be stored twice.
@@ -14,7 +19,7 @@ In Keep, information is stored in *data blocks*.  Data blocks are normally betwe
 
 In order to reassemble the file, Keep stores a *collection* data block which lists in sequence the data blocks that make up the original file.  A collection data block may store the information for multiple files, including a directory structure.
 
-In this example we will use @c1bad4b39ca5a924e481008009d94e32+210@ which we added to Keep in "the first Keep tutorial":{{ site.baseurl }}/user/tutorials/tutorial-keep.html.  First let us examine the contents of this collection using @arv keep get@:
+In this example we will use @c1bad4b39ca5a924e481008009d94e32+210@, which we added to Keep in "how to upload data":{{ site.baseurl }}/user/tutorials/tutorial-keep.html.  First let us examine the contents of this collection using @arv keep get@:
 
 <notextile>
 <pre><code>~$ <span class="userinput">arv keep get c1bad4b39ca5a924e481008009d94e32+210</span>