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>
