Grokbase Groups Hive user June 2010
Paul explained one symptom in HIVE-1435.

For the other, the way to repro it is to start from a clean checkout
from before HIVE-1176 was committed, build there and run build/dist/
bin/hive to init the metastore. Then svn update to the tip of trunk,
build again, and run hive CLI again; this time you will hit a startup
error when it tries to modify the existing Derby database.

I think Paul's HIVE-1435 patch will resolve both.


On Jun 24, 2010, at 7:35 PM, "Arvind Prabhakar" wrote:


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

On Thu, Jun 24, 2010 at 7:01 PM, John Sichi 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
names are generated by datanucleus when no name is specified in the
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,
example if you run trunk/build/dist/bin/hive against a new build in
existing sandbox (where a Derby embedded metastore had previously
created), or if you deploy against an existing production metastore

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.


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postedJun 25, '10 at 2:01a
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