{"id":37701,"date":"2019-10-31T22:19:10","date_gmt":"2019-10-31T19:19:10","guid":{"rendered":"https:\/\/prohoster.info\/blog\/monitoring-etl-protsessov-v-malenkom-hranilishhe-dannyh\/"},"modified":"2019-10-31T22:19:10","modified_gmt":"2019-10-31T19:19:10","slug":"monitoring-etl-protsessov-v-malenkom-hranilishhe-dannyh","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/administrirovanie\/monitoring-etl-protsessov-v-malenkom-hranilishhe-dannyh","title":{"rendered":"Monitoramento de processos ETL em um pequeno armazenamento de dados","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Muitos utilizam ferramentas especializadas para criar procedimentos de extra\u00e7\u00e3o, transforma\u00e7\u00e3o e carregamento de dados em bancos de dados relacionais. O processo de opera\u00e7\u00e3o das ferramentas \u00e9 registrado, e os erros s\u00e3o documentados.<\/p>\n<p>Em caso de erro, o log cont\u00e9m informa\u00e7\u00f5es sobre a falha da tarefa por parte da ferramenta e quais m\u00f3dulos (frequentemente \u00e9 o Java) onde pararam. Nas \u00faltimas linhas, \u00e9 poss\u00edvel encontrar o erro do banco de dados, como a viola\u00e7\u00e3o de uma chave \u00fanica da tabela.<\/p>\n<p>Para responder \u00e0 pergunta sobre qual o papel da informa\u00e7\u00e3o de erros do ETL, classifiquei todos os problemas que ocorreram nos \u00faltimos dois anos em um grande armaz\u00e9m. <\/p>\n<p><img decoding=\"async\" alt=\"Monitoramento de processos ETL em um pequeno armazenamento de dados\" src=\"\/wp-content\/uploads\/2019\/09\/cfe750a4a4ec952651779ec563a40e05.jpg\" style=\"display:block;margin: 0 auto;\" \/><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<p>Os erros de banco de dados incluem problemas como falta de espa\u00e7o, desconex\u00e3o, sess\u00e3o travada, entre outros.<\/p>\n<p>Os erros l\u00f3gicos incluem problemas como viola\u00e7\u00e3o de chaves da tabela, objetos inv\u00e1lidos, falta de acesso a objetos, etc.<br \/>\nO agendador pode ser executado fora do hor\u00e1rio, pode travar, entre outros.<\/p>\n<p>Erros simples n\u00e3o requerem muito tempo para serem corrigidos. A maioria deles pode ser tratada automaticamente por um bom ETL.<\/p>\n<p>Erros complexos exigem a abertura e verifica\u00e7\u00e3o dos procedimentos de manipula\u00e7\u00e3o de dados, investiga\u00e7\u00e3o das fontes de dados. Muitas vezes levam \u00e0 necessidade de testagem de altera\u00e7\u00f5es e de implanta\u00e7\u00e3o.<\/p>\n<p>Assim, metade de todos os problemas est\u00e1 relacionada ao banco de dados. 48% de todos os erros s\u00e3o erros simples.<br \/>\nUm ter\u00e7o de todos os problemas est\u00e1 associado \u00e0 altera\u00e7\u00e3o da l\u00f3gica ou modelo do armaz\u00e9m, e mais da metade desses erros s\u00e3o complexos.<\/p>\n<p>E menos de um quarto de todos os problemas est\u00e1 relacionado ao agendador de tarefas, dos quais 18% s\u00e3o erros simples.<\/p>\n<p>No total, 22% de todos os erros ocorridos s\u00e3o complexos, e sua corre\u00e7\u00e3o requer a maior aten\u00e7\u00e3o e tempo. Eles acontecem aproximadamente uma vez por semana, enquanto os erros simples ocorrem quase todos os dias.<\/p>\n<p>\u00c9 evidente que o monitoramento dos processos ETL ser\u00e1 eficaz quando o log indicar com precis\u00e3o o local do erro e exigir o menor tempo poss\u00edvel para localizar a fonte do problema.<\/p>\n<h4>Monitoramento Eficaz<\/h4>\n<p>\nO que eu gostaria de ver no processo de monitoramento do ETL?<\/p>\n<p><img decoding=\"async\" alt=\"Monitoramento de processos ETL em um pequeno armazenamento de dados\" src=\"\/wp-content\/uploads\/2019\/09\/03e6ebc3aef69137880a278f9891370a.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nIn\u00edcio em \u2014 quando come\u00e7ou a opera\u00e7\u00e3o,<br \/>\nFonte \u2014 fonte de dados,<br \/>\nCamada \u2014 qual n\u00edvel do armaz\u00e9m est\u00e1 sendo carregado,<br \/>\nNome do Trabalho ETL \u2014 procedimento de carregamento que consiste em muitos pequenos passos,<br \/>\nN\u00famero do Passo \u2014 n\u00famero do passo que est\u00e1 sendo executado,<br \/>\nLinhas Afetadas \u2014 quantos dados j\u00e1 foram processados,<br \/>\nDura\u00e7\u00e3o sec \u2014 quanto tempo est\u00e1 levando,<br \/>\nStatus \u2014 se tudo est\u00e1 bem ou n\u00e3o: OK, ERRO, EXECUTANDO, PARADO<br \/>\nMensagem \u2014 a \u00faltima mensagem de sucesso ou descri\u00e7\u00e3o do erro.<\/p>\n<p>Com base no status dos registros, \u00e9 poss\u00edvel enviar um e-mail para outros participantes. Se n\u00e3o houver erros, o e-mail n\u00e3o \u00e9 necess\u00e1rio.<\/p>\n<p>Dessa forma, em caso de erro, o local do incidente est\u00e1 claramente indicado.<\/p>\n<p>\u00c0s vezes ocorre que a pr\u00f3pria ferramenta de monitoramento n\u00e3o funciona. Nesse caso, h\u00e1 a possibilidade de chamar diretamente a visualiza\u00e7\u00e3o no banco de dados, com base na qual o relat\u00f3rio foi gerado.<\/p>\n<h4>Tabela de monitoramento ETL<\/h4>\n<p>\nPara implementar o monitoramento de processos ETL, basta uma tabela e uma visualiza\u00e7\u00e3o.<\/p>\n<p>Para isso, voc\u00ea pode voltar ao <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/462337\/\">seu pequeno reposit\u00f3rio<\/a><\/noindex> e criar um prot\u00f3tipo em um banco de dados sqlite.<\/p>\n<p><b class=\"spoiler_title\">DDL da tabela<\/b><\/p>\n<pre><code class=\"sql\">CREATE TABLE UTL_JOB_STATUS (\n\n\/* Tabela para registro de log de execu\u00e7\u00e3o de tarefa. Importante que a tarefa tenha os passos ETL_START e ETL_END ou ETL_ERROR *\/\n  UTL_JOB_STATUS_ID INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,\n  SID               INTEGER NOT NULL DEFAULT -1, \/* Identificador de Sess\u00e3o. \u00danico para cada execu\u00e7\u00e3o da tarefa *\/\n  LOG_DT            INTEGER NOT NULL DEFAULT 0,  \/* Data e hora *\/\n  LOG_D             INTEGER NOT NULL DEFAULT 0,  \/* Data *\/\n  JOB_NAME          TEXT NOT NULL DEFAULT 'N\/A', \/* Nome da tarefa como JOB_STG2DM_GEO *\/\n  STEP_NAME         TEXT NOT NULL DEFAULT 'N\/A', \/* ETL_START, ... , ETL_END\/ETL_ERROR *\/\n  STEP_DESCR        TEXT,                        \/* Descri\u00e7\u00e3o da tarefa ou mensagem de erro *\/\n  UNIQUE (SID, JOB_NAME, STEP_NAME)\n);\nINSERT INTO UTL_JOB_STATUS (UTL_JOB_STATUS_ID) VALUES (-1);<\/code><\/pre>\n<p>\n<b class=\"spoiler_title\">DDL da visualiza\u00e7\u00e3o\/relat\u00f3rio<\/b><\/p>\n<pre><code class=\"sql\">CRIE A VIS\u00c3O SE N\u00c3O EXISTIR UTL_JOB_STATUS_V\nCOM \n\/* Conte\u00fado: Registro de Execu\u00e7\u00e3o de Pacote dos \u00faltimos 3 Meses. *\/\nCOM SRC COMO (\n  SELECIONE LOG_D,\n    LOG_DT,\n    UTL_JOB_STATUS_ID,\n    SID,\n\tCASO QUANDO INSTR(JOB_NAME, 'FTP') ENT\u00c3O 'TRANSFER\u00caNCIA' \/* transfer\u00eancia de arquivo *\/\n\t     QUANDO INSTR(JOB_NAME, 'STG') ENT\u00c3O 'EST\u00c1GIO' \/* est\u00e1gio *\/\n\t     QUANDO INSTR(JOB_NAME, 'CLS') ENT\u00c3O 'LIMPEZA' \/* limpeza *\/\n\t     QUANDO INSTR(JOB_NAME, 'DIM') ENT\u00c3O 'DIMENS\u00c3O' \/* dimens\u00e3o *\/\n\t     QUANDO INSTR(JOB_NAME, 'FCT') ENT\u00c3O 'FATO' \/* fato *\/\n\t\t QUANDO INSTR(JOB_NAME, 'ETL') ENT\u00c3O 'EST\u00c1GIO-MART' \/* data mart *\/\n\t     QUANDO INSTR(JOB_NAME, 'RPT') ENT\u00c3O 'RELAT\u00d3RIO' \/* relat\u00f3rio *\/\n\t     OUTRO 'N\/A' END AS CAMADA,\n\tCASO QUANDO INSTR(JOB_NAME, 'ACCESS') ENT\u00c3O 'REGISTRO DE ACESSO' \/* fonte *\/\n\t     QUANDO INSTR(JOB_NAME, 'MASTER') ENT\u00c3O 'DADOS PRINCIPAIS' \/* fonte *\/\n\t     QUANDO INSTR(JOB_NAME, 'AD-HOC') ENT\u00c3O 'AD-HOC' \/* fonte *\/\n\t     OUTRO 'N\/A' END AS FONTE,\n    JOB_NAME,\n    STEP_NAME,\n    CASO QUANDO STEP_NAME='ETL_START' ENT\u00c3O 1 OUTRO 0 END AS INICIO_BANDEIRA,\n    CASO QUANDO STEP_NAME='ETL_END' ENT\u00c3O 1 OUTRO 0 END AS FIM_BANDEIRA,\n    CASO QUANDO STEP_NAME='ETL_ERROR' ENT\u00c3O 1 OUTRO 0 END AS ERRO_BANDEIRA,\n    STEP_NAME || ' : ' || STEP_DESCR AS REGISTRO_DE_PASSO,\n\tSUBSTR( SUBSTR(STEP_DESCR, INSTR(STEP_DESCR, '***')+4), 1, INSTR(SUBSTR(STEP_DESCR, INSTR(STEP_DESCR, '***')+4), '***')-2 ) AS LINHAS_AFETADAS\n  DE UTL_JOB_STATUS\n  ONDE datetime(LOG_D, 'unixepoch') &gt;= date('now', 'start of month', '-3 month')\n)\nSELECIONE JB.SID,\n  JB.MIN_LOG_DT AS DATA_INICIO,\n  strftime('%d.%m.%Y %H:%M', datetime(JB.MIN_LOG_DT, 'unixepoch')) AS LOG_DT,\n  JB.FONTE,\n  JB.CAMADA,\n  JB.JOB_NAME,\n  CASO\n  QUANDO JB.ERROR_FLAG = 1 ENT\u00c3O 'ERRO'\n  QUANDO JB.ERROR_FLAG = 0 E JB.END_FLAG = 0 E strftime('%s','now') - JB.MIN_LOG_DT &gt; 0.5*60*60 ENT\u00c3O 'PARADO' \/* meia hora *\/\n  QUANDO JB.ERROR_FLAG = 0 E JB.END_FLAG = 0 ENT\u00c3O 'EM EXECU\u00c7\u00c3O'\n  OUTRO 'OK'\n  FIM COMO STATUS,\n  ERR.STEP_LOG     COMO REGISTRO_DE_PASSO,\n  JB.CNT           COMO CONTAGEM_DE_PASSOS,\n  JB.LINHAS_AFETADAS AS LINHAS_AFETADAS,\n  strftime('%d.%m.%Y %H:%M', datetime(JB.MIN_LOG_DT, 'unixepoch')) AS DATA_INICIO_TRABALHO,\n  strftime('%d.%m.%Y %H:%M', datetime(JB.MAX_LOG_DT, 'unixepoch')) AS DATA_FIM_TRABALHO,\n  JB.MAX_LOG_DT - JB.MIN_LOG_DT COMO DURACAO_TRABALHO_SEC\nDE\n  ( SELECIONE SID, FONTE, CAMADA, JOB_NAME,\n           MAX(UTL_JOB_STATUS_ID) AS UTL_JOB_STATUS_ID,\n           MAX(INICIO_BANDEIRA)       AS INICIO_BANDEIRA,\n           MAX(FIM_BANDEIRA)         AS FIM_BANDEIRA,\n           MAX(ERRO_BANDEIRA)       AS ERRO_BANDEIRA,\n           MIN(LOG_DT)           AS MIN_LOG_DT,\n           MAX(LOG_DT)           AS MAX_LOG_DT,\n           SUM(1)                AS CNT,\n           SUM(IFNULL(LINHAS_AFETADAS, 0)) AS LINHAS_AFETADAS\n    DE SRC\n    GROUP BY SID, FONTE, CAMADA, JOB_NAME\n  ) JB,\n  ( SELECIONE UTL_JOB_STATUS_ID, SID, JOB_NAME, STEP_LOG\n    DE SRC\n    ONDE 1 = 1\n  ) ERR\nONDE 1 = 1\n  E JB.SID = ERR.SID\n  E JB.JOB_NAME = ERR.JOB_NAME\n  E JB.UTL_JOB_STATUS_ID = ERR.UTL_JOB_STATUS_ID\nORDENAR POR JB.MIN_LOG_DT DESC, JB.SID DESC, JB.FONTE;<\/code><\/pre>\n<p>\n<b class=\"spoiler_title\">Verifica\u00e7\u00e3o SQL da possibilidade de obter um novo n\u00famero de sess\u00e3o<\/b><\/p>\n<pre><code class=\"sql\">SELECIONE SOMA (\n  CASO QUANDO start_job.JOB_NAME \u00c9 N\u00c3O NULO E end_job.JOB_NAME \u00c9 NULO \/* trabalho existente finalizado *\/\n\t    E N\u00c3O ( 'y' = 'n' ) \/* PARAMETRO de rein\u00edcio for\u00e7ado *\/\n       ENT\u00c3O 1 OUTRO 0\n  FIM ) COMO EST\u00c1_EXECUTANDO\n  DE\n    ( SELECIONE 1 COMO dummy DE UTL_JOB_STATUS ONDE sid = -1) d_job\n  JUN\u00c7\u00c3O EXTERNA \u00c0 ESQUERDA\n    ( SELECIONE JOB_NAME, SID, 1 COMO dummy\n      DE UTL_JOB_STATUS\n      ONDE JOB_NAME = 'RPT_ACCESS_LOG' \/* PARAMETRO de nome do trabalho *\/\n\t    E STEP_NAME = 'ETL_START'\n      GROUP BY JOB_NAME, SID\n    ) start_job \/* come\u00e7a *\/\n  ON d_job.dummy = start_job.dummy\n  JUN\u00c7\u00c3O EXTERNA \u00c0 ESQUERDA\n    ( SELECIONE JOB_NAME, SID\n      DE UTL_JOB_STATUS\n      ONDE JOB_NAME = 'RPT_ACCESS_LOG'  \/* PARAMETRO de nome do trabalho *\/\n\t    E STEP_NAME IN ('ETL_END', 'ETL_ERROR') \/* status de parada *\/\n      GROUP BY JOB_NAME, SID\n    ) end_job \/* termina *\/\n  ON start_job.JOB_NAME = end_job.JOB_NAME\n     E start_job.SID = end_job.SID<\/code><\/pre>\n<p>\nCaracter\u00edsticas da tabela:<\/p>\n<ul>\n<li>O in\u00edcio e o fim do processo de processamento de dados devem ser acompanhados pelos passos ETL_START e ETL_END<\/li>\n<li>Em caso de erro, deve-se criar o passo ETL_ERROR com sua descri\u00e7\u00e3o<\/li>\n<li>A quantidade de dados processados deve ser destacada, por exemplo, com asteriscos<\/li>\n<li>Ao mesmo tempo, o mesmo procedimento pode ser iniciado com o par\u00e2metro force_restart=y; sem ele, o n\u00famero da sess\u00e3o \u00e9 gerado apenas para o procedimento conclu\u00eddo <\/li>\n<li>No modo normal, n\u00e3o \u00e9 poss\u00edvel iniciar paralelamente o mesmo procedimento de processamento de dados<\/li>\n<\/ul>\n<p>\nAs opera\u00e7\u00f5es necess\u00e1rias para trabalhar com a tabela s\u00e3o as seguintes:<\/p>\n<ul>\n<li>Obten\u00e7\u00e3o do n\u00famero da sess\u00e3o do procedimento ETL em execu\u00e7\u00e3o<\/li>\n<li>Inser\u00e7\u00e3o de registro de log na tabela<\/li>\n<li>Obten\u00e7\u00e3o do \u00faltimo registro bem-sucedido do procedimento ETL<\/li>\n<\/ul>\n<p>\nEm bancos de dados como Oracle ou Postgres, essas opera\u00e7\u00f5es podem ser implementadas com fun\u00e7\u00f5es integradas. Para sqlite, \u00e9 necess\u00e1rio um mecanismo externo e, neste caso, ele <noindex><a rel=\"nofollow\" href=\"https:\/\/gitlab.com\/marchanka\/sqlite-php-etl-utilities\/blob\/master\/utl_func.php\">foi prototipado em PHP<\/a><\/noindex>.<\/p>\n<h4>Sa\u00edda<\/h4>\n<p>\nAssim, as mensagens de erro nas ferramentas de processamento de dados desempenham um papel mega-importante. No entanto, \u00e9 dif\u00edcil consider\u00e1-las ideais para uma r\u00e1pida identifica\u00e7\u00e3o da causa do problema. Quando o n\u00famero de procedimentos se aproxima de cem, o monitoramento dos processos se torna um projeto complicado.<\/p>\n<p>O artigo apresenta um exemplo de poss\u00edvel solu\u00e7\u00e3o para o problema na forma de um prot\u00f3tipo. Todo o prot\u00f3tipo de pequeno armazenamento est\u00e1 dispon\u00edvel no gitlab <noindex><a rel=\"nofollow\" href=\"https:\/\/gitlab.com\/marchanka\/sqlite-php-etl-utilities\">SQLite PHP ETL Utilities<\/a><\/noindex>.<br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/465637\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041c\u043d\u043e\u0433\u0438\u0435 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0442 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0435 \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u044b \u0434\u043b\u044f \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f \u043f\u0440\u043e\u0446\u0435\u0434\u0443\u0440 \u0438\u0437\u0432\u043b\u0435\u0447\u0435\u043d\u0438\u044f, \u0442\u0440\u0430\u043d\u0441\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438 \u0438 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