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# troubleshootings
Slackbot
09/28/2022, 7:20 AMThis message was deleted.
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kfaraz
09/28/2022, 7:32 AMThe frequency of creating compaction tasks depends on coordinator indexing period (30 minutes by default). The actual number of tasks created would depend on the configured task slot ratio.
kfaraz
09/28/2022, 7:33 AMkfaraz
09/28/2022, 7:44 AMhttps://druid.apache.org/docs/latest/operations/api-reference.html#post-4
Use this API to set task slots for compaction
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Karan Kumar
09/28/2022, 3:36 PMAnother common trap which I can speak from experience is not setting the
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Amatya Avadhanula
09/28/2022, 5:02 PM@Vishal K, Could you please share how many free task slots you have and the value being set for maxNumConcurrentSubTasks for the compact tasks?
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Vishal K
09/30/2022, 10:36 AMmaxNumConcurrentSubTasks is not set Should we specify this for compaction spec also. And what should be an ideal value?
And how do I get number of free task slots.. We have 1 spare worker for now.
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Amatya Avadhanula
09/30/2022, 10:58 AMIts default value is 1. Setting it too high a value can also mean that fewer compactions run simultaneously