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is there enough memory for 24 gb heap? How much memory is available per node?

I think around 15GB, but I thought it would not get the 24g but whatever we have in

druid_processing_buffer_sizeBytes

by

druid_processing_numThreads

, I currently have 12 and 4 respectively which comes down to less than 15GB

This looks like the issue, I would make those much smaller as it is more than each node can allocate

config: {
        DRUID_XMX: '24g',
        DRUID_XMS: '24g',

This does not look right.

[
{"path"\:"/opt/druid/var/druid/segment-cache","maxSize"\:"1754200000000"}, {"path"\:"/opt/druid/var/druid/segment-cache","maxSize"\:"1858900000000"}, {"path"\:"/opt/druid/var/druid/segment-cache","maxSize"\:"1858900000000"}, {"path"\:"/opt/druid/var/druid/segment-cache","maxSize"\:"1858900000000"}
]

They are all pointing at the same path.

Shouldn't they be one entry in the array per replica? It's true there are 12 replicas and only 4 entries in the array

if the historical logs just end, without it starting up successfully, for clues you can check dmesg (to see if it was oom-killed) or historical.stdout.log (for messages from jvm)