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From Todd Lipcon <t...@cloudera.com>
Subject Re: Java KuduClient table references
Date Tue, 05 Jun 2018 17:22:05 GMT
Hi Philipp,

What you're seeing is expected -- internally, after you open a table, the
client will use that table's internal UUID rather than its name to perform
operations. This is similar semantics to opening a file and then renaming
it on a POSIX filesystem.

Creating a new KuduClient instance should definitely result in new Table
instances. There is no singleton or cross-client-instance caching going on.
In fact, even re-opening the table from an existing client instance should
return a new KuduTable instance, since we don't cache the table->tableId
mapping as far as I can recall.

Are you sure that you properly called 'openTable' to get a new KuduTable
instance, and are using that new KuduTable to create the new scanners?

-Todd

On Tue, Jun 5, 2018 at 1:50 AM, Philipp-A Hoffmann <
philipp-a.hoffmann@postbank.de> wrote:

> Hi there,
>
> I'm experiencing the following issue with the Java Kudu API:
>
> If I'm re-creating my tables (no schema changes) in Impala while my Kudu
> application is running, Kudu keeps the old table references. That results
> in a warning ("org.apache.kudu.client.AsyncKuduScanner: Can not open
> scanner") followed by an exception ("NonRecoverableException: The table was
> deleted: Table deleted at ...") while accessing the table. I've tried to
> create a new KuduClient instance using the KuduClientBuilder, but it's
> still getting the old table references. Is there any way to clear these
> references?
>
> Kind regards,
> Philipp
>
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-- 
Todd Lipcon
Software Engineer, Cloudera

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