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Review request for hive. Summary (updated) ----------------- HIVE-13075 | Metastore shuts down when no delegation token is found in ZooKeeper Repository: hive-git Description (updated) ------- When you have multiple metastore instances storing tokens in ZooKeeper, there could be a race condition in ExpiredTokenRemover causing one metastore to remove tokens already removed by another instance. This is a simple solution for that problem. `null` is perfectly fine as a return value in `ZooKeeperTokenStore::getToken`. Diffs ----- Diff: https://reviews.apache.org/r/43651/diff/ Testing ------- Thanks, Piotr Wikie?
