*: lock unchanged rows for pessimistic transaction (#14045) #14049
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/run-all-tests |
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Dec 13, 2019
| @@ -116,6 +117,11 @@ func updateRecord(ctx sessionctx.Context, h int64, oldData, newData []types.Datu | |||
| if ctx.GetSessionVars().ClientCapability&mysql.ClientFoundRows > 0 { | |||
| sc.AddAffectedRows(1) | |||
| } | |||
| unchangedRowKey := tablecodec.EncodeRowKeyWithHandle(t.Meta().ID, h) | |||
| txnCtx := sctx.GetSessionVars().TxnCtx | |||
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Suggested change
| txnCtx := sctx.GetSessionVars().TxnCtx | |
| txnCtx := ctx.GetSessionVars().TxnCtx |
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cherry-pick #14045 to release-3.0
What problem does this PR solve?
The pessimistic lock is not acquired if a row is unchanged.
What is changed and how it works?
Add the unchanged row key to TxnCtx, later collect them before calling LockKeys.
Check List
Tests
Related changes
Release note