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Assertion `keys >= 0.0' failed in double Cost_model_table::key_compare_cost(double) const

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George Lorch November 2, 2017 at 4:16 PM

DOC-635

George Lorch November 1, 2017 at 10:38 PM

George Lorch September 25, 2017 at 6:21 PM

TokuDB limits minimum block_size to 4K, I believe similar limit should be places on MyRocks

George Lorch September 25, 2017 at 6:17 PM

Confirmed as described. This seems to be another MyRocks 'sensible limits and defaults' issue where it make no sense to allow a block_size of 12 bytes. This can not be reproduced as-in with InnoDB or TokuDB as they both have minimum limits on their page/block sizes and therefore will never likely return a handler::info stats that calculates keys_per_block to <= 1 in cost_group_min_max.

This is also not reproducible on upstream Facebook MySQL because the optimizer code has been changed greatly between MySQL 5.6 and FB 5.6 and MySQL 5.6 and MySQL 5.7.

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Created September 24, 2017 at 9:39 AM
Updated December 27, 2018 at 6:29 PM
Resolved November 2, 2017 at 4:16 PM
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