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## What changes were proposed in this pull request? The RPC framework will not serialize and deserialize messages in local mode, we should not call `acc.value` when receive heartbeat message, because the serialization hook of new accumulator may not be triggered and the `atDriverSide` flag may not be set. ## How was this patch tested? tested it locally via spark shell Author: Wenchen Fan <wenchen@databricks.com> Closes #12795 from cloud-fan/bug. |
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