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Brief explanation of what the Swarm health processor does

Brief explanation of what the Swarm health processor does

Jun 08, 2017

The Swarm health processor is a process that runs on each Swarm node to check the status of streams. The health processor performs the following actions:

  • Sends replica checks to the other nodes and based on that adds or trims replicas

  • Deletes streams that require deletion according to lifepoints

  • Provides a safety net to remove older alias and named stream versions when a newer version is found in the cluster (can happen due to node restores or dropped multicasts)

  • Checks each stream for data corruption by comparison with the stored stream hash

  • Moves the stream on disk if defragmentation is necessary

  • Insures the disk index is consistent with the streams found on disk

  • Ensures proper subcluster distribution of replicas