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Posted to commits@cassandra.apache.org by "Jan Karlsson (JIRA)" <ji...@apache.org> on 2014/11/24 10:32:13 UTC
[jira] [Created] (CASSANDRA-8366) Repair grows data on nodes,
causes load to become unbalanced
Jan Karlsson created CASSANDRA-8366:
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Summary: Repair grows data on nodes, causes load to become unbalanced
Key: CASSANDRA-8366
URL: https://issues.apache.org/jira/browse/CASSANDRA-8366
Project: Cassandra
Issue Type: Bug
Environment: 4 node cluster
2.1.2 Cassandra
Inserts and reads are done with CQL driver
Reporter: Jan Karlsson
There seems to be something weird going on when repairing data.
I have a program that runs 2 hours which inserts 250 random numbers and reads 250 times per second. It creates 2 keyspaces with SimpleStrategy and RF of 3.
I use size-tiered compaction for my cluster.
After those 2 hours I run a repair and the load of all nodes goes up. If I run incremental repair the load goes up alot more. I saw the load shoot up 8 times the original size multiple times with incremental repair. (from 2G to 16G)
with node 9 8 7 and 7 the repro procedure looked like this:
(Note that running full repair first is not a requirement to reproduce.)
After 2 hours of 250 reads + 250 writes per second:
UN 9 583.39 MB 256 ? 28220962-26ae-4eeb-8027-99f96e377406 rack1
UN 8 584.01 MB 256 ? f2de6ea1-de88-4056-8fde-42f9c476a090 rack1
UN 7 583.72 MB 256 ? 2b6b5d66-13c8-43d8-855c-290c0f3c3a0b rack1
UN 6 583.84 MB 256 ? b8bd67f1-a816-46ff-b4a4-136ad5af6d4b rack1
Repair -pr -par on all nodes sequentially
UN 9 746.29 MB 256 ? 28220962-26ae-4eeb-8027-99f96e377406 rack1
UN 8 751.02 MB 256 ? f2de6ea1-de88-4056-8fde-42f9c476a090 rack1
UN 7 748.89 MB 256 ? 2b6b5d66-13c8-43d8-855c-290c0f3c3a0b rack1
UN 6 758.34 MB 256 ? b8bd67f1-a816-46ff-b4a4-136ad5af6d4b rack1
repair -inc -par on all nodes sequentially
UN 9 2.41 GB 256 ? 28220962-26ae-4eeb-8027-99f96e377406 rack1
UN 8 2.53 GB 256 ? f2de6ea1-de88-4056-8fde-42f9c476a090 rack1
UN 7 2.6 GB 256 ? 2b6b5d66-13c8-43d8-855c-290c0f3c3a0b rack1
UN 6 2.17 GB 256 ? b8bd67f1-a816-46ff-b4a4-136ad5af6d4b rack1
after rolling restart
UN 9 1.47 GB 256 ? 28220962-26ae-4eeb-8027-99f96e377406 rack1
UN 8 1.5 GB 256 ? f2de6ea1-de88-4056-8fde-42f9c476a090 rack1
UN 7 2.46 GB 256 ? 2b6b5d66-13c8-43d8-855c-290c0f3c3a0b rack1
UN 6 1.19 GB 256 ? b8bd67f1-a816-46ff-b4a4-136ad5af6d4b rack1
compact all nodes sequentially
UN 9 989.99 MB 256 ? 28220962-26ae-4eeb-8027-99f96e377406 rack1
UN 8 994.75 MB 256 ? f2de6ea1-de88-4056-8fde-42f9c476a090 rack1
UN 7 1.46 GB 256 ? 2b6b5d66-13c8-43d8-855c-290c0f3c3a0b rack1
UN 6 758.82 MB 256 ? b8bd67f1-a816-46ff-b4a4-136ad5af6d4b rack1
repair -inc -par on all nodes sequentially
UN 9 1.98 GB 256 ? 28220962-26ae-4eeb-8027-99f96e377406 rack1
UN 8 2.3 GB 256 ? f2de6ea1-de88-4056-8fde-42f9c476a090 rack1
UN 7 3.71 GB 256 ? 2b6b5d66-13c8-43d8-855c-290c0f3c3a0b rack1
UN 6 1.68 GB 256 ? b8bd67f1-a816-46ff-b4a4-136ad5af6d4b rack1
restart once more
UN 9 2 GB 256 ? 28220962-26ae-4eeb-8027-99f96e377406 rack1
UN 8 2.05 GB 256 ? f2de6ea1-de88-4056-8fde-42f9c476a090 rack1
UN 7 4.1 GB 256 ? 2b6b5d66-13c8-43d8-855c-290c0f3c3a0b rack1
UN 6 1.68 GB 256 ? b8bd67f1-a816-46ff-b4a4-136ad5af6d4b rack1
Is there something im missing or is this strange behavior?
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