config: disable local latch by default (#12068) #12095
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Signed-off-by: Shuaipeng Yu <jackysp@gmail.com>
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type/3.0 cherry-pick
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francis0407
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Nov 1, 2019
This reverts commit 7f41ed3.
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cherry-pick #12068 to release-3.0
Signed-off-by: Shuaipeng Yu jackysp@gmail.com
What problem does this PR solve?
The local latch has a large memory usage for TiDB when importing data. In addition, there is a problem of inconsistency in the error message of the write conflict. After TiDB 3.0 supported pessimistic transaction, its role in reducing conflicts was also weakened. So, it is best to turn it off by default.
What is changed and how it works?
Turn it off by default.
Check List
Tests
Code changes
Related changes
tidb-ansiblerepository