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e39f4b399c
Before waiting on stale_versions_in_use(), we log the stale versions the barrier_and_drain handler will wait for, along with the number of token_metadata references representing each version. To achieve this, we store a pointer to token_metadata in version_tracker, traverse the _trackers list, and output all items with a version smaller than the latest. Since token_metadata contains the version_tracker instance, it is guaranteed to remain alive during traversal. To count references, token_metadata now inherits from enable_lw_shared_from_this. This helps diagnose tablet migration stalls and allows more deterministic tests: when a barrier is expected to block, we can verify that the log contains the expected stale versions rather than checking that the barrier_and_drain is blocked on stale_versions_in_use() for a fixed amount of time.