Brief Explanation of What Swarm's Health Processor Does

Problem

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

Solution

Normally no action needed by user.

Knowledge Base

Brief Explanation of What Swarm's Health Processor Does

Problem

Solution

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