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Posted to commits@hbase.apache.org by st...@apache.org on 2011/04/12 06:52:37 UTC
svn commit: r1091290 - in /hbase/trunk: CHANGES.txt src/docbkx/book.xml
Author: stack
Date: Tue Apr 12 04:52:37 2011
New Revision: 1091290
URL: http://svn.apache.org/viewvc?rev=1091290&view=rev
Log:
HBASE-3764 Book.xml - adding 2 FAQs (SQL and arch question)
Modified:
hbase/trunk/CHANGES.txt
hbase/trunk/src/docbkx/book.xml
Modified: hbase/trunk/CHANGES.txt
URL: http://svn.apache.org/viewvc/hbase/trunk/CHANGES.txt?rev=1091290&r1=1091289&r2=1091290&view=diff
==============================================================================
--- hbase/trunk/CHANGES.txt (original)
+++ hbase/trunk/CHANGES.txt Tue Apr 12 04:52:37 2011
@@ -148,6 +148,7 @@ Release 0.91.0 - Unreleased
coprocessor collection
HBASE-3729 Get cells via shell with a time range predicate
(Ted Yu via Stack)
+ HBASE-3764 Book.xml - adding 2 FAQs (SQL and arch question)
TASK
HBASE-3559 Move report of split to master OFF the heartbeat channel
Modified: hbase/trunk/src/docbkx/book.xml
URL: http://svn.apache.org/viewvc/hbase/trunk/src/docbkx/book.xml?rev=1091290&r1=1091289&r2=1091290&view=diff
==============================================================================
--- hbase/trunk/src/docbkx/book.xml (original)
+++ hbase/trunk/src/docbkx/book.xml Tue Apr 12 04:52:37 2011
@@ -1235,6 +1235,26 @@ false
</para>
</answer>
</qandaentry>
+ <qandaentry xml:id="faq.sql">
+ <question><para>Does HBase support SQL?</para></question>
+ <answer>
+ <para>
+ Not really. SQL-ish support for HBase via <link xlink:href="http://hive.apache.org/">Hive</link> is in development, however Hive is based on MapReduce which is not generally suitable for low-latency requests.
+ See the <link linkend="datamodel">Data Model</link> section for examples on the HBase client.
+ </para>
+ </answer>
+ </qandaentry>
+ <qandaentry xml:id="faq.hdfs.hbase">
+ <question><para>How does HBase work on top of HDFS?</para></question>
+ <answer>
+ <para>
+ <link xlink:href="http://hadoop.apache.org/hdfs/">HDFS</link> is a distributed file system that is well suited for the storage of large files. It's documentation
+ states that it is not, however, a general purpose file system, and does not provide fast individual record lookups in files.
+ HBase, on the other hand, is built on top of HDFS and provides fast record lookups (and updates) for large tables. This can sometimes be a point of conceptual confusion.
+ See the <link linkend="datamodel">Data Model</link> and <link linkend="architecture">Architecture</link> sections for more information on how HBase achieves its goals.
+ </para>
+ </answer>
+ </qandaentry>
<qandaentry xml:id="brand.new.compressor">
<question><para>Why are logs flooded with '2011-01-10 12:40:48,407 INFO org.apache.hadoop.io.compress.CodecPool: Got
brand-new compressor' messages?</para></question>