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docs: add upgrade notice for batch GC changes (#15985)

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Luiz Aoqui
2023-01-31 15:04:12 -05:00
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website/content/docs/upgrade/upgrade-specific.mdx
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@@ -84,6 +84,36 @@ The metric `nomad.nomad.broker.total_blocked` has been changed to
leader's broker, and this is easily confused with the unrelated evaluation
status `"blocked"` in the Nomad API.
#### Garbage collection of evaluations and allocations for batch job
Versions prior to 1.5.0 only delete evaluations and allocations of batch jobs
that are explicitly stopped which can lead to unbounded memory growth of Nomad
when the batch job is executed multiple times.
Nomad 1.5.0 introduces a new server configuration
[`batch_eval_gc_threshold`](/nomad/docs/configuration/server#batch_eval_gc_threshold)
to control how allocations and evaluations for batch jobs are collected.
The default threshold is `24h`. If you need to access completed allocations for
batch jobs that are older than 24h you must increase this value when upgrading
Nomad.
## Nomad 1.4.4, 1.3.9
#### Garbage collection of evaluations and allocations for batch job
Versions prior to 1.4.4 and 1.3.9 only delete evaluations and allocations of
batch jobs that are explicitly stopped which can lead to unbounded memory
growth of Nomad when the batch job is executed multiple times.
Nomad 1.4.4 and 1.3.9 introduces a new server configuration
[`batch_eval_gc_threshold`](/nomad/docs/configuration/server#batch_eval_gc_threshold)
to control how allocations and evaluations for batch jobs are collected.
The default threshold is `24h`. If you need to access completed allocations for
batch jobs that are older than 24h you must increase this value when upgrading
Nomad.
## Nomad 1.4.0
#### Possible Panic During Upgrades