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What does Message Latency under Cassandra Reference

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Applies to

StorageGRID

Answer

This attribute reports the duration that each message must wait until it is fully executed.

Whenever a message is sent from one node to another, it attaches a timestamp to it along with some versioning information. The first thing the receiving system will do is compare that timestamp to "now". This is what drives the metric. It will then look at the datacenter the source is from to determine which metrics to increment and by how much.

The metric records incoming latency from all things using the message service. The message service is used for read/writes but is also used for streaming and gossip.

This would also be related to deletes and the EC rebalance.

All metadata needs to be updated with where the new location of data will be during a move of erasure coded data.

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