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HBASE-4640 Catch ClosedChannelException and document it 

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1245730 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Jean-Daniel Cryans 2012-02-17 19:56:54 +00:00
parent 5b542b7921
commit 6fa8f6a042
2 changed files with 15 additions and 1 deletions
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11
src/docbkx/troubleshooting.xml
View File

@ -888,7 +888,7 @@ ERROR org.apache.hadoop.hbase.regionserver.HRegionServer: ZooKeeper session expi
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.runtime.codecmsgs">
<title>Logs flooded with '2011-01-10 12:40:48,407 INFO org.apache.hadoop.io.compress.CodecPool: Got
brand-new compressor' messages</title>
@ -898,6 +898,15 @@ ERROR org.apache.hadoop.hbase.regionserver.HRegionServer: ZooKeeper session expi
symlink them into place and the message should go away.
</para>
</section>
<section xml:id="trouble.rs.runtime.client_went_away">
<title>Server handler X on 60020 caught: java.nio.channels.ClosedChannelException</title>
<para>
If you see this type of message it means that the region server was trying to read/send data from/to a client but
it already went away. Typical causes for this are if the client was killed (you see a storm of messages like this when a MapReduce
job is killed or fails) or if the client receives a SocketTimeoutException. It's harmless, but you should consider digging in
a bit more if you aren't doing something to trigger them.
</para>
</section>
</section>
<section xml:id="trouble.rs.shutdown">

5
src/main/java/org/apache/hadoop/hbase/ipc/HBaseServer.java
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@ -1378,6 +1378,11 @@ public abstract class HBaseServer implements RpcServer {
// rethrow if no handler
throw e;
}
} catch (ClosedChannelException cce) {
LOG.warn(getName() + " caught a ClosedChannelException, " +
"this means that the server was processing a " +
"request but the client went away. The error message was: " +
cce.getMessage());
} catch (Exception e) {
LOG.warn(getName() + " caught: " +
StringUtils.stringifyException(e));