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7b9d867358
Make the following changes to the telemetry reporter background worker: - Add a read lock to the current relation that the reporter collects stats for. This lock protects against concurrent deletion of the relation, which could lead to errors that would prevent the reporter from completing its report. - Set an active snapshot in the telemetry background process for use when scanning a relation for stats collection. - Reopen the scan iterator when collecting chunk compression stats for a relation instead of keeping it open and restarting the scan. The previous approach seems to cause crashes due to memory corruption of the scan state. Unfortunately, the exact cause has not been identified, but the change has been verified to work on a live running instance (thanks to @abrownsword for the help with reproducing the crash and testing fixes). Fixes #4266