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From jmhs...@apache.org
Subject git commit: HBASE-11782 Document that hbase.MetaMigrationConvertingToPB needs to be set to true for migrations pre 0.96 (Misty Stanley-Jones)
Date Mon, 25 Aug 2014 20:54:36 GMT
Repository: hbase
Updated Branches:
  refs/heads/branch-1 77085d0ff -> 465d7d85a


HBASE-11782 Document that hbase.MetaMigrationConvertingToPB needs to be set to true for migrations
pre 0.96 (Misty Stanley-Jones)


Project: http://git-wip-us.apache.org/repos/asf/hbase/repo
Commit: http://git-wip-us.apache.org/repos/asf/hbase/commit/465d7d85
Tree: http://git-wip-us.apache.org/repos/asf/hbase/tree/465d7d85
Diff: http://git-wip-us.apache.org/repos/asf/hbase/diff/465d7d85

Branch: refs/heads/branch-1
Commit: 465d7d85a661cb85cef42d6392d90e54552bf689
Parents: 77085d0
Author: Jonathan M Hsieh <jmhsieh@apache.org>
Authored: Mon Aug 25 13:52:22 2014 -0700
Committer: Jonathan M Hsieh <jmhsieh@apache.org>
Committed: Mon Aug 25 13:52:22 2014 -0700

----------------------------------------------------------------------
 src/main/docbkx/upgrading.xml | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/hbase/blob/465d7d85/src/main/docbkx/upgrading.xml
----------------------------------------------------------------------
diff --git a/src/main/docbkx/upgrading.xml b/src/main/docbkx/upgrading.xml
index 733df3d..1b68c2e 100644
--- a/src/main/docbkx/upgrading.xml
+++ b/src/main/docbkx/upgrading.xml
@@ -259,6 +259,21 @@ Successfully completed Log splitting
 17:22:15    at Client_4_3_0.main(Client_4_3_0.java:63)</screen>
                 </section>
             </section>
+            <section>
+                <title>Upgrading <code>META</code> to use Protocol Buffers
(Protobuf)</title>
+                <para>When you upgrade from versions prior to 0.96, <code>META</code>
needs to be
+                    converted to use protocol buffers. This is controlled by the configuration
+                    option <option>hbase.MetaMigrationConvertingToPB</option>,
which is set to
+                        <literal>true</literal> by default. Therefore, by default,
no action is
+                    required on your part.</para>
+                <para>The migration is a one-time event. However, every time your cluster
starts,
+                        <code>META</code> is scanned to ensure that it does not
need to be
+                    converted. If you have a very large number of regions, this scan can
take a long
+                    time. Starting in 0.98.5, you can set
+                        <option>hbase.MetaMigrationConvertingToPB</option> to
+                        <literal>false</literal> in <filename>hbase-site.xml</filename>,
to disable
+                    this start-up scan. This should be considered an expert-level setting.</para>
+            </section>
         </section>
 
 


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