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thelastpickle / cassandra-reaper

Automated Repair Awesomeness for Apache Cassandra
http://cassandra-reaper.io/
Apache License 2.0
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API REST repair_run segmentCountPerNode #1475

Closed xaviergainon closed 9 months ago

xaviergainon commented 9 months ago

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Hi,

I try to create a repair with a specific segmentCount value through the rest aPI but the result is systematically the creation of a repair with 14 segments which corresponds to the number of nodes in my cluster.

I tested with segmentCount=128 and segmentCountPerNode=128 but I still ended up with 14 segments

repair_run?clusterName=mycluster&keyspace=mykeyspace&owner=myowner&segmentCountPerNode=128&segmentCount=128

the return api : { "cause": "no cause specified", "owner": "myowner", "id": "baf6d810-d4e6-11ee-9f4b-310c6a3ce6d7", "state": "NOT_STARTED", "intensity": 0.8999999761581421, "duration": null, "cluster_name": "mycluster", "column_families":[ "path", "file_chunk" ], "keyspace_name": "mykeyspace", "incremental_repair": true, "total_segments": 14, "repair_parallelism": "PARALLEL", "segments_repaired": 0, "last_event": "no events", "nodes":[], "datacenters":[], "blacklisted_tables":[], "repair_thread_count": 1, "repair_unit_id": "315c1600-d4e2-11ee-9227-8967019589c6", "segment_timeout": 30, "adaptive_schedule": false, "end_time": null, "creation_time": "2024-02-26T20:36:33Z", "start_time": null, "pause_time": null, "current_time": "2024-02-26T20:36:33Z", "estimated_time_of_arrival": null }

Thank for your help

adejanovski commented 9 months ago

Hi,

Incremental repairs cannot be performed in a subrange mode, Cassandra won't allow this due to the overhead of anticompaction. As such, the segment count per node will be ignored by Reaper and a single segment will be created per node in the cluster.

xaviergainon commented 9 months ago

HI,

Thank you for this feedback, I understand better