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HBase, mail # user - Odd WARN in hbase 0.94.2


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Re: Odd WARN in hbase 0.94.2
Kevin O'dell 2013-03-06, 20:43
Hi Byran,

One of engineers wanted me to pass this recommendation along:

The issue here is mostly likely a missing configuration.

We need to have this configuration on both the DataNode and RegionServer:
<property>
  <name>dfs.domain.socket.path</name>
  <value>/var/run/hadoop-hdfs/dn._PORT</value>
</property>
<property>
  <name>dfs.client.read.shortcircuit</name>
  <value>true</value>
</property>

In CDH4.1 and earlier, the DN didn't need to be configured to use SCR,
so most likely he does not have dfs.client.read.shortcircuit set in
hdfs-site.xml.  Adding that should fix it

On Tue, Mar 5, 2013 at 5:17 PM, Bryan Beaudreault
<[EMAIL PROTECTED]>wrote:

> Yep we do have that property set to that value.  The file does not seem to
> exist when I try ls'ing it myself.  I'm not sure where it comes from or how
> it should be created.
>
>
> On Tue, Mar 5, 2013 at 4:35 PM, Kevin O'dell <[EMAIL PROTECTED]
> >wrote:
>
> > Bryan,
> >
> >   What permissions did you set for the SCRs?  The DNs need
> >
> > <property>
> > <name>dfs.datanode.data.dir.perm</name>
> > <value>755</name>
> > </property>
> >
> >
> > On Tue, Mar 5, 2013 at 4:28 PM, Bryan Beaudreault
> > <[EMAIL PROTECTED]>wrote:
> >
> > > We are running hbase 0.94.2, cdh4.2 edition.  We have the local read
> > > shortcut enabled.  Since updating to this version I've seen a bunch of
> > WARN
> > > messages corresponding to exceptions trying to connect to what looks
> like
> > > the local DN.
> > >
> > > As far as I can tell it doesn't appear to be having much affect on the
> RS
> > > but it'd be nice to clear it up and know for sure that it doesn't
> > indicate
> > > some problem. Has anyone ever seen this and know what it is or how to
> fix
> > > it?
> > >
> > > http://pastebin.com/PA6Y9pJN
> > >
> > > Thanks!
> > >
> >
> >
> >
> > --
> > Kevin O'Dell
> > Customer Operations Engineer, Cloudera
> >
>

--
Kevin O'Dell
Customer Operations Engineer, Cloudera