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HBASE-3764 Book.xml - adding 2 FAQs (SQL and arch question) 

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1091290 13f79535-47bb-0310-9956-ffa450edef68
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Michael Stack 2011-04-12 04:52:37 +00:00
parent f616c0c709
commit afa5418210
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1
CHANGES.txt
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@ -148,6 +148,7 @@ Release 0.91.0 - Unreleased
coprocessor collection coprocessor collection
HBASE-3729 Get cells via shell with a time range predicate HBASE-3729 Get cells via shell with a time range predicate
(Ted Yu via Stack) (Ted Yu via Stack)
HBASE-3764 Book.xml - adding 2 FAQs (SQL and arch question)
TASK TASK
HBASE-3559 Move report of split to master OFF the heartbeat channel HBASE-3559 Move report of split to master OFF the heartbeat channel

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src/docbkx/book.xml
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@ -1235,6 +1235,26 @@ false
</para> </para>
</answer> </answer>
</qandaentry> </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"> <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 <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> brand-new compressor' messages?</para></question>