chetanmeh commented on issue #3453: Introduce a AttachmentStore SPI URL: https://github.com/apache/incubator-openwhisk/pull/3453#issuecomment-374598806 > dont follow the need for the volatile attachments. The updates to state are performed via stream stage and hence is single threaded. However reads can happen concurrently in other threads so the reference to map is marked as `var` and `volatile`
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