JSR-352: Fix session handling in PartitionMapper and BeforeChunkBatchlet

Description

PartitionMapper creates an unnecessary session, and BeforeChunkBatchlet doesn't close its session

Environment

None

Status

Assignee

Yoann Rodière

Reporter

Yoann Rodière

Labels

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Suitable for new contributors

None

Pull Request

None

Feedback Requested

None

Components

Priority

Major