Where are shard relocations and failures logged?

Elastic Stack Elasticsearch
1

Hi,

We would like to detect when a shard fails, begins relocating off of a node, and finishes relocating. We do use the metrics that show the count of these active operations, but would like to additionally know the specific shard, index, and nodes involved.

I am aware that we can enable logging at a per-java-package level, but I don't know which logs might have this information. Are there any specific logs that capture this information?

We're using ES 5.6 temporarily, and will be on 7.9 soon.

Thank you!

2

Shard failures are logged at WARN in the usual server logs. I don't know of any logging specifically for the start/stop of relocations, although you might be able to deduce something from DEBUG or TRACE logging. The usual practice seems to be to poll GET _recovery?active_only. See also this open issue:

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