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Why is this deadlock happening?
Posted by: Vinicius Faleiro
Date: May 04, 2024 07:58AM

I see that one microsservice is causing this deadlock bellow but couldn't find the root cause. I wouldn't expect this to happen sice 2 different threads are executing a replace command for 2 different keys on the table. Any idea?

Table DDL

CREATE TABLE faturamento (
DT_FATURA date NOT NULL COMMENT 'Data da fatura',
COD_GRUPO_FATURA varchar(500) NOT NULL
JSON_CFG_COBRANCA json NOT NULL
VL_BRUTO decimal(32,16) NOT NULL
VL_DESCONTO decimal(32,16) DEFAULT NULL
VL_LIQUIDO decimal(32,16) NOT NULL
JSON_APURACOES json NOT NULL
DESCONTOS_APLICADOS json NOT NULL
PRIMARY KEY (DT_FATURA,COD_GRUPO_FATURA)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;
Database output (table was empty)

2024-05-03 19:26:03 367417139072
*** (1) TRANSACTION:
TRANSACTION 8020, ACTIVE 0 sec inserting
mysql tables in use 1, locked 1
LOCK WAIT 3 lock struct(s), heap size 1128, 2 row lock(s)
MySQL thread id 1172, OS thread handle 370219057024, query id 47288 172.19.0.9 root update
replace into faturamento (
DT_FATURA,
COD_GRUPO_FATURA,
JSON_CFG_COBRANCA,
VL_BRUTO,
VL_DESCONTO,
VL_LIQUIDO,
DESCONTOS_APLICADOS,JSON_APURACOES)
values ('2030-02-01', 'B', '{\n "cobrancaItens" : [ {\n "metodo" : "DELEGATE",\n "configuracao" : "{\\"delegateConfig\\":{\\"autoConfirmada\\":true,\\"queue\\":\\"delegate.queue\\"}}"\n } ],\n "configRetentativas" : [ {\n "metodo" : "DELEGATE",\n "totalRetentativas" : 1,\n "contadorRetentativas" : null,\n "frequencia" : "DIARIA",\n "dia" : 0\n } ]\n}', 102.90, 0.00, 102.90, '[ ]', '[ {\n "dtMovimento" : "2030-02-01",\n "idItemApurado" : "c6bf5dff-9c88-4952-98d5-a43df68a20b3",\n "idCicloApuracao" : "2030-01-01-1-2030",\n "frequencia" : "DIARIA",\n "vlPrecoApuracaoRef" : 102.90,\n "tpValorApuracao" : "TARIFA",\n "qtdCumulativaApuracaoCiclo" : 31,\n "vlSaldoAcumulado" : 102.9000000000000000,\n "cfgUltimaApuracao" : {\n "modelo" : "FIXO",\n "frequencia" : "DIARIA",\n "dia" : 1,\n "condicao" : null\n },\n "jsonItemApurado" : "{\\n \\"id\\" : \\"c6bf5dff-9c88-4952-98d5-a43df68a20b3\\",\\n \\"codContratante\\" : 9000001,\\n \\"codContratada\\" : 1000006,\\n \\"dtInicioVigencia\\" : \\"2999-01-01\\",\\n \\"dtFimVigencia\\" : \\"2024-01-01\\",\\n \\"infoAdicionalContratante\\" : \\"{\\\\\\"mcc\\\\\\": \\\\\\"105\\\\\\", \\\\\\"cnae\\\\\\": 3350707, \\\\\\"cnpj\\\\\\": \\\\\\"12.22.184/0001-04\\\\\\"}\\",\\n \\"infoAdicionalContratada\\" : \\"{}\\",\\n \\"cfgPrecificacao\\" : {\\n \\"insumo\\" : null,\\n \\"refContrato\\" : null,\\n \\"faixas\\" : null,\\n \\"fixo\\" : {\\n \\"tipo\\" : \\"TARIFA\\",\\n \\"valor\\" : 102.9\\n }\\n },\\n \\"cfgApuracao\\" : {\\n \\"modelo\\" : \\"FIXO\\",\\n \\"frequencia\\" : \\"DIARIA\\",\\n \\"dia\\" : 1,\\n \\"condicao\\" : null\\n },\\n \\"cfgDesconto\\" : null,\\n \\"cfgFaturamento\\" : {\\n \\"frequencia\\" : \\"MENSAL\\",\\n \\"dia\\" : 1,\\n \\"codAgrupamentoFatura\\" : \\"B\\",\\n \\"diasFaturamento\\" : 0\\n },\\n \\"cfgCobranca\\" : {\\n \\"cobrancaItens\\" : [ {\\n \\"metodo\\" : \\"DELEGATE\\",\\n \\"configuracao\\" : \\"{\\\\\\"delegateConfig\\\\\\":{\\\\\\"autoConfirmada\\\\\\":true,\\\\\\"queue\\\\\\":\\\\\\"delegate.queue\\\\\\"}}\\"\\n } ],\\n \\"configRetentativas\\" : [ {\\n \\"metodo\\" : \\"DELEGATE\\",\\n \\"totalRetentativas\\" : 1,\\n \\"frequencia\\" : \\"DIARIA\\",\\n \\"dia\\" : 0\\n } ]\\n },\\n \\"cdStatus\\" : \\"ATIVO\\"\\n}",\n "dtCriacaoRegistro" : "2024-04-29T19:01:52-03:00",\n "dtUltimaAtualiacao" : "2024-05-03T13:23:52-03:00",\n "tpValorDesconto" : null\n} ]' )

*** (1) HOLDS THE LOCK(S):
RECORD LOCKS space id 18 page no 4 n bits 72 index PRIMARY of table `apurador`.`faturamento` trx id 8020 lock_mode X
Record lock, heap no 1 PHYSICAL RECORD: n_fields 1; compact format; info bits 0
0: len 8; hex 73757072656d756d; asc supremum;;


*** (1) WAITING FOR THIS LOCK TO BE GRANTED:
RECORD LOCKS space id 18 page no 4 n bits 72 index PRIMARY of table `apurador`.`faturamento` trx id 8020 lock_mode X insert intention waiting
Record lock, heap no 1 PHYSICAL RECORD: n_fields 1; compact format; info bits 0
0: len 8; hex 73757072656d756d; asc supremum;;


*** (2) TRANSACTION:
TRANSACTION 8022, ACTIVE 0 sec inserting
mysql tables in use 1, locked 1
LOCK WAIT 3 lock struct(s), heap size 1128, 2 row lock(s)
MySQL thread id 1193, OS thread handle 372167667584, query id 47290 172.19.0.9 root update
replace into faturamento (
DT_FATURA,
COD_GRUPO_FATURA,
JSON_CFG_COBRANCA,
VL_BRUTO,
VL_DESCONTO,
VL_LIQUIDO,
DESCONTOS_APLICADOS,JSON_APURACOES)
values ('2030-02-01', 'A', '{\n "cobrancaItens" : [ {\n "metodo" : "DELEGATE",\n "configuracao" : "{\\"delegateConfig\\":{\\"autoConfirmada\\":true,\\"queue\\":\\"delegate.queue\\"}}"\n } ],\n "configRetentativas" : [ {\n "metodo" : "DELEGATE",\n "totalRetentativas" : 1,\n "contadorRetentativas" : null,\n "frequencia" : "DIARIA",\n "dia" : 0\n } ]\n}', 89.90, 0.00, 89.90, '[ ]', '[ {\n "dtMovimento" : "2030-02-01",\n "idItemApurado" : "7b3107c0-930e-4e6f-9090-54cf73ac5b05",\n "idCicloApuracao" : "2030-01-01-1-2030",\n "frequencia" : "DIARIA",\n "vlPrecoApuracaoRef" : 89.90,\n "tpValorApuracao" : "TARIFA",\n "qtdCumulativaApuracaoCiclo" : 30,\n "vlSaldoAcumulado" : 89.9000000000000000,\n "cfgUltimaApuracao" : {\n "modelo" : "FIXO",\n "frequencia" : "DIARIA",\n "dia" : 1,\n "condicao" : null\n },\n "jsonItemApurado" : "{\\n \\"id\\" : \\"7b3107c0-930e-4e6f-9090-54cf73ac5b05\\",\\n \\"codContratante\\" : 9000001,\\n \\"codContratada\\" : 7000005,\\n \\"dtInicioVigencia\\" : \\"2999-01-01\\",\\n \\"dtFimVigencia\\" : \\"2024-01-01\\",\\n \\"infoAdicionalContratante\\" : \\"{\\\\\\"mcc\\\\\\": \\\\\\"998\\\\\\", \\\\\\"cnae\\\\\\": 3250709, \\\\\\"cnpj\\\\\\": \\\\\\"11.156.184/0001-08\\\\\\"}\\",\\n \\"infoAdicionalContratada\\" : \\"{}\\",\\n \\"cfgPrecificacao\\" : {\\n \\"insumo\\" : null,\\n \\"refContrato\\" : null,\\n \\"faixas\\" : null,\\n \\"fixo\\" : {\\n \\"tipo\\" : \\"TARIFA\\",\\n \\"valor\\" : 89.9\\n }\\n },\\n \\"cfgApuracao\\" : {\\n \\"modelo\\" : \\"FIXO\\",\\n \\"frequencia\\" : \\"DIARIA\\",\\n \\"dia\\" : 1,\\n \\"condicao\\" : null\\n },\\n \\"cfgDesconto\\" : null,\\n \\"cfgFaturamento\\" : {\\n \\"frequencia\\" : \\"MENSAL\\",\\n \\"dia\\" : 1,\\n \\"codAgrupamentoFatura\\" : \\"A\\",\\n \\"diasFaturamento\\" : 0\\n },\\n \\"cfgCobranca\\" : {\\n \\"cobrancaItens\\" : [ {\\n \\"metodo\\" : \\"DELEGATE\\",\\n \\"configuracao\\" : \\"{\\\\\\"delegateConfig\\\\\\":{\\\\\\"autoConfirmada\\\\\\":true,\\\\\\"queue\\\\\\":\\\\\\"delegate.queue\\\\\\"}}\\"\\n } ],\\n \\"configRetentativas\\" : [ {\\n \\"metodo\\" : \\"DELEGATE\\",\\n \\"totalRetentativas\\" : 1,\\n \\"frequencia\\" : \\"DIARIA\\",\\n \\"dia\\" : 0\\n } ]\\n },\\n \\"cdStatus\\" : \\"ATIVO\\"\\n}",\n "dtCriacaoRegistro" : "2024-04-29T22:22:50-03:00",\n "dtUltimaAtualiacao" : "2024-05-03T13:23:52-03:00",\n "tpValorDesconto" : null\n} ]' )

*** (2) HOLDS THE LOCK(S):
RECORD LOCKS space id 18 page no 4 n bits 72 index PRIMARY of table `apurador`.`faturamento` trx id 8022 lock_mode X
Record lock, heap no 1 PHYSICAL RECORD: n_fields 1; compact format; info bits 0
0: len 8; hex 73757072656d756d; asc supremum;;


*** (2) WAITING FOR THIS LOCK TO BE GRANTED:
RECORD LOCKS space id 18 page no 4 n bits 72 index PRIMARY of table `apurador`.`faturamento` trx id 8022 lock_mode X insert intention waiting
Record lock, heap no 1 PHYSICAL RECORD: n_fields 1; compact format; info bits 0
0: len 8; hex 73757072656d756d; asc supremum;;

*** WE ROLL BACK TRANSACTION (2)
I tried to analyze de db logs but couldn't understand why a replace command in two different table keys caused a deadlock.

I was able to reproduce the problem using 2 mysql clients. Steps:

execute begin transaction on both clients
execute query on both clients using different values for parameter COD_GRUPO_FATURA: SELECT DT_FATURA, COD_GRUPO_FATURA, JSON_CFG_COBRANCA, VL_BRUTO, VL_DESCONTO, VL_LIQUIDO, DESCONTOS_APLICADOS,JSON_APURACOES from faturamento where DT_FATURA = ? and COD_GRUPO_FATURA = ? FOR UPDATE
execute query on both clients using same parameters from step 2: replace into faturamento ( DT_FATURA, COD_GRUPO_FATURA, JSON_CFG_COBRANCA, VL_BRUTO, VL_DESCONTO, VL_LIQUIDO, DESCONTOS_APLICADOS,JSON_APURACOES)
question is: aren't both commands using row lock? why the deadlock?

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Why is this deadlock happening?
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May 04, 2024 07:58AM


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