Result incomplete:Insert failed due to LRU cache being full.;The database will be put in read-only mode about arangodb HOT 4 OPEN

The error happens when there is no more capacity in the RocksDB block cache, and no other data in the block cache shard can be freed.
Can you try setting the startup option --rocksdb.enforce-block-cache-size-limit to false? That should help avoid this particular error.
Btw, version 3.10.1 is more than a year old, and 3.10.2 changed the value of the startup option to false. So even better than changing the value of the startup option and stay on 3.10.1 would be to upgrade to the newest version of 3.10, or even to 3.11.

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We modify the arangod.conf,add line as

After this, we restart the server, the dbserver will still throw the error

It seems the particular error is not resolved.

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Are you sure that the config file is being used, i.e. that the right config file was modified?
Because the option is supposed to work just fine, and if it doesn't, it is likely that it has been put into a config file that is not being used.

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OK，this time, we set the enforce-block-cache-size-limit to false and we also drop the table that cause the error, and restart again, the error disappeared. Thanks~

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