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https://issues.apache.org/jira/browse/PIG-3222?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13619401#comment-13619401
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Daniel Dai commented on PIG-3222:
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I dive a little deeper, here is what I find:
1. We did set signature twice, this is due to double parse of the script. The
behavior is not changed for a while. Actually Pig will not use the first
signature to invoke other methods of StoreFunc (other than
setStoreFuncUDFContextSignature)
2. Pig did connect to metastore 3 times. But I didn't see an easy way to get
around. Pig do need to connect to metastore and load/store some metadata in 3
different contexts. HiveMetaStoreClient does cache metastore connection, but it
is within one JVM, which does not help in such case.
[~pengfeng], can you agree that?
> New UDFContextSignature assignments in Pig 0.11 breaks HCatalog.HCatStorer
> ---------------------------------------------------------------------------
>
> Key: PIG-3222
> URL: https://issues.apache.org/jira/browse/PIG-3222
> Project: Pig
> Issue Type: Bug
> Components: impl
> Affects Versions: 0.11
> Reporter: Feng Peng
> Labels: hcatalog
> Attachments: PigStorerDemo.java
>
>
> Pig 0.11 assigns different UDFContextSignature for different invocations of
> the same load/store statement. This change breaks the HCatStorer which
> assumes all front-end and back-end invocations of the same store statement
> has the same UDFContextSignature so that it can read the previously stored
> information correctly.
> The related HCatalog code is in
> https://svn.apache.org/repos/asf/incubator/hcatalog/branches/branch-0.5/hcatalog-pig-adapter/src/main/java/org/apache/hcatalog/pig/HCatStorer.java
> (the setStoreLocation() function).
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