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Type:
Improvement
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Resolution: Fixed
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Priority:
Major - P3
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Affects Version/s: None
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Component/s: None
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Labels:None
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Description of Drivers Ticket:
Downstream Change Summary
The reIndex command can now only be run on a standalone mongod.
Description of Linked Ticket
Trying to run the 'reIndex' command on a secondary while having unfinished prepared transactions will hit an invariant. After dropping the index that will be re-indexed, we hit an invariant when doing a collection scan to insert all the documents in the collection for that index.
Invariant failure lock.mode != MODE_S && lock.mode != MODE_X {6917529027641081857: Global, 1} in X src/mongo/db/storage/wiredtiger/wiredtiger_prepare_conflict.h 111
ldeng recommended to try set the 'canIgnorePrepareConflicts' flag to true for the 'reIndex' command but that ended up hitting another invariant while trying to drop all the indexes.
WiredTiger error (95) [1572545292:296845][8488:0x7f381342b700], file:_mdb_catalog.wt, WT_CURSOR.insert: __wt_txn_modify, 463: Transactions with ignore_prepare=true cannot perform updates: Operation not supported Raw: [1572545292:296845][8488:0x7f381342b700], file:_mdb_catalog.wt, WT_CURSOR.insert: __wt_txn_modify, 463: Transactions with ignore_prepare=true cannot perform updates: Operation not supported Invariant failure: ret resulted in status UnknownError: 95: Operation not supported at src/mongo/db/storage/wiredtiger/wiredtiger_record_store.cpp 1442
We should consider disallowing the 'reIndex' command from running on secondaries and removing it in a future release.
See DRIVERS-1183 for updated details.