Brief Explanation of What Swarm's Health Processor Does


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


Normally no action needed by user. 

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