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Error:close index channel failed/too many tablet versions

Issue description:

Frequent imports and failure to merge compaction result in too many versions. The default number is 1000.

Solution:

Increase data load for one-time import and decrease import frequency.

Adjust compaction strategy and speed up compaction (memory and io should be carefully studied after adjustment). And make the following changes to be.conf:

cumulative_compaction_num_threads_per_disk = 4
base_compaction_num_threads_per_disk = 2
cumulative_compaction_check_interval_seconds = 2