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Cassandra nodetool command offload memory

Solved553 views19th August 2024
2
Stefan Schedletzky [DevOps Enabler]2.06K 19th August 2024 0 Comments

Hi,

someone told me a command which I can’t remember. It was a useful command before stopping Cassandra. Something like offload everything which is in the memory. Does someone knows this command?

Stefan Schedletzky [DevOps Enabler] Answered question 19th August 2024

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Brent Alleweireldt [SLC]1.61K Posted 19th August 2024 0 Comments

Hi Stefan,

There are 2 commands that fit this description and both have their use. These commands are:

Nodetool flush: flush everything in memory on disk, but cassandra keeps listening for new updates/deletes. Useful right before taking a backup where service should not be interupted.

Nodetool drain: Flushes all the in-memory stuff and closes the listening port so no new changes can be serviced by this node. Useful when you have to shutdown the node for maintenance as the startup will not need to replay all the commitlogs.

Stefan Schedletzky [DevOps Enabler] Selected answer as best 19th August 2024
0
Stefan Schedletzky [DevOps Enabler]2.06K Posted 19th August 2024 0 Comments

Hi Brent,

drain is the one I was looking for. Many thanks!

Stefan Schedletzky [DevOps Enabler] Answered question 19th August 2024
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