24 lines
958 B
Text
24 lines
958 B
Text
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[[_clustering_db_lock]]
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=== Serialized Cluster Startup
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Note that {{book.project.name}} supports concurrent startup by more cluster nodes at the same.
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When {{book.project.name}} boots up it may do some database migration, importing, or first time initializations. The server
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makes use of a DB lock which prevents these startup actions from running and conflicting with eachother when nodes are
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booted concurrently.
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By default, the maximum timeout for lock is 900 seconds, so in case that second node is not able to acquire the lock within 900 seconds, it fails to start.
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The lock checking is done every 2 seconds by default.
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Typically you won't need to increase/decrease the default value, but just in case it's possible to configure it in `keycloak-server.json`:
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[source,json]
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----
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"dblock": {
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"jpa": {
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"lockWaitTimeout": 900,
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"lockRecheckTime": 2
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}
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}
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----
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or similarly if you're using Mongo (just by replace `jpa` with `mongo`)
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