This issue tracks the progress of implementing a mutable ID tracker without backing RocksDB.

Tasks

• Mutable in-memory ID tracker without RocksDB #6150
• Add mutable ID tracker tests #6158
• Mutable ID tracker: implement byte storage format for mappings #6166
• Mutable ID tracker: implement storage for point versions #6169
• Mutable ID tracker: truncate mappings file if last entry is partial #6173
• Mutable ID tracker integration #6174
• Mutable ID tracker: when using new tracker, don't create RocksDB CFs #6203
• Mutable ID tracker: show warning if mapping and versions count mismatch #6207
• Check use_mutable_id_tracker_without_rocksdb feature flag when building new segment #6211
• Mutable ID tracker: improve version flushing, grow file in one shot #6267
• Qdrant 1.14: enable mutable ID tracker by default #6268
• Actively migrate away from RocksDB based ID tracker #6579

Backlog

• improve storage format (possibly use format from immutable ID tracker)
• more resilient against flush failures (don't crash if partially flushed)
• store internal point versions as map, not as appendable list
• truncate mapping changes file if partially persisted
• rename files on disk to not collide with other ID tracker
• integrate, use as default