what is the maximum number of key that golang map can have?

[Gyu-Ho Lee]

Is there any cap on Go's built-in map or slice? I know slice can have cap but what is the maximum number of elements that we can have in one map and slice?

I am thinking about having my entries in Redis or other key-value storage until I have too many entries to store in memory.

Any advice will be appreciated. Thanks!

[Caleb Spare]

The length and capacity of slices and maps are ints, so I believe that
the int size on your platform (as well as available memory, of course)
are the only limitations.

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[Caleb Spare]

(not that maps have a cap)

[Gyu-Ho Lee]

I see. Thanks! I learned it today.

https://golang.org/ref/spec#Numeric_types

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[Harmen B]

Be careful with the garbage collector, though. If you keep millions of elements around the garbage collector might give you longer pauses than you would like (but this behavior is likely to change in next Go versions, for the better).

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[Dave Cheney]

There is no limit the number of elements you can store in a map save the limitations of your hardware or the current maximum size of the heap.

[Gyu-Ho Lee]

I see. Yeah I see that after storing over 2 million, my program pauses a bit long.

Thanks, Dave and Harmen.