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HBASE-4108 book.xml/troubleshooting.xml - moving troubleshooting info out of FAQ into troubleshooting chapter 

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1147346 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Michael Stack 2011-07-15 23:36:14 +00:00
parent 547394ad0f
commit 754d79e7e6
2 changed files with 26 additions and 22 deletions
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25
src/docbkx/book.xml
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@ -1550,38 +1550,21 @@ When I build, why do I always get <code>Unable to find resource 'VM_global_libra
<qandadiv><title>Runtime</title>
<qandaentry>
<question><para>
Loading, why do I see pauses when loading HBase?
I'm having problems with my HBase cluster, how can I troubleshoot it?
</para></question>
<answer>
<para>
If compression is enabled, see this thread up on the user list,
<link xlink:href="http://search-hadoop.com/m/WUnLM6ojHm1/Long+client+pauses+with+compression&amp;subj=Long+client+pauses+with+compression">Long client pauses with compression</link>.
See <xref linkend="trouble" />.
</para>
</answer>
</qandaentry>
<qandaentry>
<question><para>
Why does my RegionServer hang inexplicitly?
How can I improve HBase cluster performance?
</para></question>
<answer>
<para>
Are you running an old JVM (&lt; 1.6.0_u21?)? When you look at a thread dump,
does it look like threads are BLOCKED but no one holds the lock all are
blocked on? See <link xlink:href="https://issues.apache.org/jira/browse/HBASE-3622">HBASE 3622 Deadlock in HBaseServer (JVM bug?)</link>.
Adding <code>-XX:+UseMembar</code> to the HBase <varname>HBASE_OPTS</varname> in <filename>conf/hbase-env.sh</filename>
may fix it.
</para>
</answer>
</qandaentry>
<qandaentry>
<question><para>
Why do I see double the actual count of regionservers, once by domain name and then by IP?
</para></question>
<answer>
<para>
Fix your DNS. In versions of HBase before 0.92.x, reverse DNS needs to give same answer
as forward lookup. See <link xlink:href="https://issues.apache.org/jira/browse/HBASE-3431">HBASE 3431
Regionserver is not using the name given it by the master; double entry in master listing of servers</link> for gorey details.
See <xref linkend="performance" />.
</para>
</answer>
</qandaentry>

21
src/docbkx/troubleshooting.xml
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@ -455,6 +455,9 @@ hadoop 17789 155 35.2 9067824 8604364 ? S&lt;l Mar04 9855:48 /usr/java/j
more data is packed into the same region, but performance is achieved by being able to write larger files - which is why HBase waits until the flushize before writing a new StoreFile. And smaller StoreFiles
become targets for compaction. Without compression the files are much bigger and don't need as much compaction, however this is at the expense of I/O.
</para>
<para>
For additional information, see this thread on <link xlink:href="http://search-hadoop.com/m/WUnLM6ojHm1/Long+client+pauses+with+compression&amp;subj=Long+client+pauses+with+compression">Long client pauses with compression</link>.
</para>
</section>
@ -546,6 +549,16 @@ java.lang.UnsatisfiedLinkError: no gplcompression in java.library.path
<section xml:id="trouble.rs.runtime">
<title>Runtime Errors</title>
<section xml:id="trouble.rs.runtime.hang">
<title>RegionServer Hanging</title>
<para>
Are you running an old JVM (&lt; 1.6.0_u21?)? When you look at a thread dump,
does it look like threads are BLOCKED but no one holds the lock all are
blocked on? See <link xlink:href="https://issues.apache.org/jira/browse/HBASE-3622">HBASE 3622 Deadlock in HBaseServer (JVM bug?)</link>.
Adding <code>-XX:+UseMembar</code> to the HBase <varname>HBASE_OPTS</varname> in <filename>conf/hbase-env.sh</filename>
may fix it.
</para>
</section>
<section xml:id="trouble.rs.runtime.filehandles">
<title>java.io.IOException...(Too many open files)</title>
<para>
@ -649,6 +662,14 @@ ERROR org.apache.hadoop.hbase.regionserver.HRegionServer: ZooKeeper session expi
and then the client goes back to .META. to find the new location of the moved region.</para>
<para>However, if the NotServingRegionException is logged ERROR, then the client ran out of retries and something probably wrong.</para>
</section>
<section xml:id="trouble.rs.runtime.double_listed_regions">
<title>Regions listed by domain name, then IP</title>
<para>
Fix your DNS. In versions of HBase before 0.92.x, reverse DNS needs to give same answer
as forward lookup. See <link xlink:href="https://issues.apache.org/jira/browse/HBASE-3431">HBASE 3431
RegionServer is not using the name given it by the master; double entry in master listing of servers</link> for gorey details.
</para>
</section>
</section>
<section xml:id="trouble.rs.shutdown">