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From Calvin Lei <ckp...@gmail.com>
Subject Re: IllegalArgumentException: Connection is null or closed when calling HConnection.getTable()
Date Tue, 20 Jan 2015 00:29:52 GMT
Thanks. I was more curious why the connection would be closed.

On Mon, Jan 19, 2015 at 5:22 PM, Ted Yu <yuzhihong@gmail.com> wrote:

> Here is related code from HTable ctor:
>
>     if (connection == null || connection.isClosed()) {
>       throw new IllegalArgumentException("Connection is null or closed.");
>     }
> It was likely that connection was closed (from your description of your
> code).
>
> If HConnectionImplementation were to check the status of connection before
> calling HTable ctor, that would be helpful.
> For the moment, your application should check the status of connection.
>
> Cheers
>
> On Mon, Jan 19, 2015 at 1:48 PM, Calvin Lei <ckplei@gmail.com> wrote:
>
> > I upgraded to 0.98.0.2.1.1.0-385-hadoop2. The exception from hbase is:
> >
> > java.lang.IllegalArgumentException: Connection is null or closed.
> >   at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:302)
> >   at
> >
> >
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getTable(HConnectionManager.java:763)
> >   at
> >
> >
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getTable(HConnectionManager.java:745)
> >   at
> >
> >
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getTable(HConnectionManager.java:740)
> >
> >
> > On Mon, Jan 19, 2015 at 4:37 PM, Ted Yu <yuzhihong@gmail.com> wrote:
> >
> > > Which 0.98 release did you upgrade to ?
> > >
> > > Can you pastebin the whole stack trace ?
> > >
> > > Thanks
> > >
> > >
> > >
> > > > On Jan 19, 2015, at 1:25 PM, Calvin Lei <ckplei@gmail.com> wrote:
> > > >
> > > > Dear all,
> > > >   I recently upgrade to HBase 0.0.98 and I have started seeing the
> > error
> > > > "Connection is null or closed" when calling HConnection.getTable().
> > > >   As recommended by the documentation, I create a HConnection using
> > > > HConnectionManager.createConnection(config) and at app start and
> close
> > > the
> > > > connection at app shut down. Looks like the state of the cluster has
> > > > changed during the lifetime of the app and the HConnection closes out
> > all
> > > > connections.
> > > >    Do i have to check isClosed() before I call getTable()?
> > >
> >
>

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