@Lorenzo The issue seems to be related to HIVE-27191 where some mhl_txnids do not exist in TXNS,completed_txn_components txn_components table but they are still present in min_history_level table, as a result, the cleaner gets blocked and many entries are stuck in the ready-for-cleaning state. To confirm that collect the output of below query   SELECT MHL_TXNID FROM HIVE.MIN_HISTORY_LEVEL WHERE MHL_MIN_OPEN_TXNID = (SELECT MIN(MHL_MIN_OPEN_TXNID) FROM HIVE.MIN_HISTORY_LEVEL);   Once we get the output of the above query check if those txn ids are there in TXNS,completed_txn_components txn_components tables using below commands.   select * from txn_components where tc_txnid IN (MHL_TXNID ); select * from completed_txn_components where ctc_txnid IN (MHL_TXNID); select * from TXNS where ctc_txnid IN (MHL_TXNID);   If we got 0 results from the above queries this confirms that the MHL_TXNIDs we got above are orphans and we need to remove them in order to unblock the cleaner.   delete from MIN_HISTORY_LEVEL where MHL_TXNID=13422; --(repeat for all)   Hope this helps you in resolving the issue ... View more