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From "Grant Ingersoll (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-2869) CassandraStorage does not function properly when used multiple times in a single pig script due to UDFContext sharing issues
Date Thu, 07 Jul 2011 18:27:16 GMT
CassandraStorage does not function properly when used multiple times in a single pig script
due to UDFContext sharing issues
----------------------------------------------------------------------------------------------------------------------------

                 Key: CASSANDRA-2869
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2869
             Project: Cassandra
          Issue Type: Bug
          Components: Contrib
            Reporter: Grant Ingersoll


CassandraStorage appears to have threading issues along the lines of those described at http://pig.markmail.org/message/oz7oz2x2dwp66eoz
due to the sharing of the UDFContext.

I believe the fix lies in implementing
{code}
public void setStoreFuncUDFContextSignature(String signature)
    {
    }
{code}

and then using that signature when getting the UDFContext.

>From the Pig manual:
{quote}
setStoreFunc!UDFContextSignature(): This method will be called by Pig both in the front end
and back end to pass a unique signature to the Storer. The signature can be used to store
into the UDFContext any information which the Storer needs to store between various method
invocations in the front end and back end. The default implementation in StoreFunc has an
empty body. This method will be called before other methods.
{quote}

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