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Hive >> mail # user >> JDO upgrade issue with HIVE-1176

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Re: JDO upgrade issue with HIVE-1176

Can you describe the problem in more detail and perhaps give us an example
that can be reproduced?


On Thu, Jun 24, 2010 at 7:01 PM, John Sichi <[EMAIL PROTECTED]> wrote:

> Hi all,
> Yesterday I committed Arvind's patch for HIVE-1176, which includes an
> upgrade from datanucleus 1.x to 2.x.
> The patch works fine against a clean checkout, but just now Paul Yang and I
> noticed a couple of problems introduced due to a change in the way column
> names are generated by datanucleus when no name is specified in the JDO
> mapping (which is the case for some of ours such as "isCompressed").  This
> is a heads-up for people who happen to pull from latest trunk.
> The problems only occur when running against an existing metastore, for
> example if you run trunk/build/dist/bin/hive against a new build in an
> existing sandbox (where a Derby embedded metastore had previously been
> created), or if you deploy against an existing production metastore DB.
> In a developer sandbox, the default configuration tries to auto-update the
> schema to add the new column names, and hits an error due to the way the
> Derby ALTER TABLE statement is generated.  If you hit this, a workaround is
> to delete your trunk/metastore_db directory so that a fresh schema will be
> recreated instead.  Or just move to a fresh checkout.
> Paul is taking a look at the column name generation to see if we can get it
> to match the datanucleus 1.x behavior.