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From st...@apache.org
Subject svn commit: r995233 - /hbase/trunk/src/docbkx/book.xml
Date Wed, 08 Sep 2010 19:57:16 GMT
Author: stack
Date: Wed Sep  8 19:57:16 2010
New Revision: 995233

URL: http://svn.apache.org/viewvc?rev=995233&view=rev
Log:
HBASE-2889 Tool to look at HLogs -- parse and tail -f; added part 1, some fixup of hlog main;
added a bit of documentation on hlog tool

Modified:
    hbase/trunk/src/docbkx/book.xml

Modified: hbase/trunk/src/docbkx/book.xml
URL: http://svn.apache.org/viewvc/hbase/trunk/src/docbkx/book.xml?rev=995233&r1=995232&r2=995233&view=diff
==============================================================================
--- hbase/trunk/src/docbkx/book.xml (original)
+++ hbase/trunk/src/docbkx/book.xml Wed Sep  8 19:57:16 2010
@@ -661,5 +661,22 @@
           </footnote></para>
       </section>
     </section>
+    <section>
+        <title>WAL Tools</title>
+            <section>
+                <title><classname>HLog</classname> main</title>
+                <para>The main method on <classname>HLog</classname> offers
manual split and dump facilities.
+                </para>
+                <para>
+                    You can get a textual dump of a WAL file content by doing the following:
+                    <code>bin/hbase org.apache.hadoop.hbase.regionserver.wal.HLog --dump
hdfs://example.org:9000/hbase/.logs/example.org,60020,1283516293161/10.10.21.10%3A60020.1283973724012</code>

+                    The return code will be non-zero if issues with the file so you can test
wholesomeness of file by
+                    redirecting <varname>STDOUT</varname> to <code>/dev/null</code>
and testing the program return.
+                </para>
+                <para>Similarily you can force a split of a log file directory by doing
+                    <code>bin/hbase org.apache.hadoop.hbase.regionserver.wal.HLog --split
hdfs://example.org:9000/hbase/.logs/example.org,60020,1283516293161/</code> 
+               </para>
+            </section>
+     </section>
   </chapter>
 </book>



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