森华数据库尖刺并发问题排查

1、背景

森华集群每个整点十分会有数据库尖刺访问，根据DBA排查可能与flute表的查询有关

***** Now date time is 2022-03-14 13:10:24 ***** 
ID    USER    HOST    DB    COMMAND    TIME    STATE    INFO
1153095    flute    172.21.181.30:33622    flute_dx    Query    0    statistics    select\n     \n     \n    id, ip, host_time, expiration_time, `status`, version, filebeat_status, filebeat_version\n   \n    from fluted\n     \n       \n     WHERE (  ip = '10.248.64.150' )
1153094    flute    172.21.181.30:33620    flute_dx    Query    0    statistics    select\n     \n     \n    id, ip, host_time, expiration_time, `status`, version, filebeat_status, filebeat_version\n   \n    from fluted\n     \n       \n     WHERE (  ip = '10.248.64.196' )
1153093    flute    172.21.181.30:33618    flute_dx    Query    0    statistics    select\n     \n     \n    id, ip, host_time, expiration_time, `status`, version, filebeat_status, filebeat_version\n   \n    from fluted\n     \n       \n     WHERE (  ip = '10.105.82.25' )
1153092    flute    172.21.181.30:33616    flute_dx    Query    0    statistics    select\n     \n     \n    id, ip, host_time, expiration_time, `status`, version, filebeat_status, filebeat_version\n   \n    from fluted\n     \n       \n     WHERE (  ip = '10.248.64.30' )1153080    flute    172.21.181.30:33590    flute_dx    Query    1    statistics    select\n     \n     \n    id, ip, host_time, expiration_time, `status`, version, filebeat_status, filebeat_version\n   \n    from fluted\n     \n       \n     WHERE (  ip = '172.21.163.24' )
1153079    odeon_streaming    172.21.184.63:60368    streaming_server_v2    Query    1    statistics    select \n     \n    id, job_base_conf_id, version_conf_id, project, application_id, flink_job_id, flink_version_code, \n    current_version_flag, job_type, version, chk_url, savepoint_url_id, args, run_time, `status`,\n    stopping_status_flag, is_locked, del_flag, update_user_name, update_time, create_user_name, \n    create_time, launch_user, launch_time\n   \n    from job\n    where id = 2247\n    and del_flag = 0
1153078    flute    172.21.181.30:33584    flute_dx    Query    1    statistics    select\n     \n     \n    id, ip, host_time, expiration_time, `status`, version, filebeat_status, filebeat_version\n   \n    from fluted\n     \n       \n     WHERE (  ip = '10.248.64.209' )
1153077    flute    172.21.181.30:33572    flute_dx    Query    1    statistics    select\n     \n     \n    id, ip, host_time, expiration_time, `status`, version, filebeat_status, filebeat_version\n   \n    from fluted\n     \n       \n     WHERE (  ip = '172.21.163.30' )1153073    flute    172.21.181.30:33564    flute_dx    Query    1    update    insert into tunnel_monitor_record (endpoint, metric,\n    `timestamp`, step, `value`,\n    counter_type, tags)\n    values\n      \n      ('10.100.122.11', 'filebeat-offset-delay', 1647234600, 60, 64532, 'GAUGE', 'project=iflysec,tunnelId=485')\n     , \n      ('10.100.122.11', 'filebeat-offset-read', 1647234600, 60, 117945215, 'GAUGE', '485')\n     \n    ON DUPLICATE KEY UPDATE `value` = `value` + VALUES(`value`)
1153072    flute    172.21.181.30:33562    flute_dx    Query    1    statistics    select\n     \n     \n    id, ip, host_time, expiration_time, `status`, version, filebeat_status, filebeat_version\n   \n    from fluted\n     \n       \n     WHERE (  ip = '10.105.110.11' )
1153071    flute    172.21.181.30:33560    flute_dx    Query    1    statistics    select\n     \n     \n    id, ip, host_time, expiration_time, `status`, version, filebeat_status, filebeat_version\n   \n    from fluted\n     \n       \n     WHERE (  ip = '10.248.64.181' )
1153070    flute    172.21.181.30:33558    flute_dx    Query    1    statistics    select\n     \n     \n    id, ip, host_time, expiration_time, `status`, version, filebeat_status, filebeat_version\n   \n    from fluted\n     \n       \n     WHERE (  ip = '10.248.64.112' )
1153069    flute    172.21.181.30:33556    flute_dx    Query    1    statistics    select\n     \n     \n    id, ip, host_time, expiration_time, `status`, version, filebeat_status, filebeat_version\n   \n    from fluted\n     \n       \n     WHERE (  ip = '10.248.64.183' )
1153063    cloudera    172.21.181.20:37106    ifly_cp_hadoop_amon    Query    1    Sending data    SELECT NAME FROM PARTITION_INFO WHERE BASE_TABLE = 'CMON_ATT_LMV' AND END_TS < 1646025049229
1153062    cloudera    172.21.181.20:37105    ifly_cp_hadoop_amon    Query    1    NULL    TRUNCATE TABLE ids_to_delete_1647234649203
1152553    u_shipper_v2    172.21.181.30:50400    shipper_v2    Query    0    Sending data    SELECT  id,ip,host_time,heart_time,status,version,filebeat_status,filebeat_version  FROM fluted  WHERE (       (  ip = '10.105.113.26' ) )
1152531    u_shipper_v2    172.21.181.30:49890    shipper_v2    Query    2    init    DELETE FROM monitor_record  where id in 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   cloudera    172.21.181.20:41850    ifly_cp_hadoop_scm    Query    1    statistics    select processes0_.HOST_ID as HOST6_20_1_, processes0_.PROCESS_ID as PROCESS1_27_1_, processes0_.PROCESS_ID as PROCESS1_27_0_, processes0_.OPTIMISTIC_LOCK_VERSION as OPTIMIST2_27_0_, processes0_.NAME as NAME3_27_0_, processes0_.ROLE_ID as ROLE4_27_0_, processes0_.COMMAND_ID as COMMAND5_27_0_, processes0_.HOST_ID as HOST6_27_0_, processes0_.PROCESS_USER as PROCESS7_27_0_, processes0_.PROCESS_GROUP as PROCESS8_27_0_, processes0_.PROGRAM as PROGRAM9_27_0_, processes0_.ARGUMENTS as ARGUMEN10_27_0_, processes0_.RUNNING as RUNNING11_27_0_, processes0_.RUN_GENERATION as RUN12_27_0_, processes0_.ONE_OFF as ONE13_27_0_, processes0_.AUTO_RESTART as AUTO14_27_0_, processes0_.CONFIGURATION_DATA as CONFIGU15_27_0_, processes0_.CONFIG_GENERATION as CONFIG16_27_0_, processes0_.STATUS_LINKS as STATUS17_27_0_, processes0_.RESOURCES as RESOURC18_27_0_, processes0_.ENVIRONMENT as ENVIRON19_27_0_, processes0_.REFRESH_FILES as REFRESH20_27_0_, processes0_.CREATED_INSTANT as CREATED21_27_0_, processes0_.UPDATED_INSTANT as UPDATED22_27_0_, processes0_.SPECIAL_FILE_INFO as SPECIAL23_27_0_, processes0_.REQUIRED_PARCEL_TAGS as REQUIRE24_27_0_, processes0_.OPTIONAL_PARCEL_TAGS as OPTIONA25_27_0_, processes0_.EXTRA_GROUPS as EXTRA26_27_0_, processes0_.START_SECS as START27_27_0_ from PROCESSES processes0_ where processes0_.HOST_ID=441

2、出题初步定位

排查flute表查询相关的服务，flute服务与datahub-monitor(日志通道监控服务) 均会查询flute表，但是flute表相关查询都是页面手动查询，初步怀疑是否由datahub-monitor中定时任务造成。

在Datahub-monitor服务中存在每十分钟一次的定时调度任务，具有一定的嫌疑。该定时任务每十分钟调度一次，与数据库高并发查询的现象并不吻合。

3、停服测试

配合数据库方在整点十分停掉datahub-monitor服务，数据库的连接数确实出现了下降，那这样说来，数据库的连接数增多确实与datahub-monitor有一定关系。DBA还对整点十分的数据库连接进行了抓包，从抓包结果来看，每个整点十分，flute的连接数都有明显的提升，且是最多的一个。

 

 

4、结合日志，定位排查

为了更加准确地定位问题，需要结合服务的日志进行排查。在这个过程中一个十分棘手的问题出现了，Datahub-monitor服务日志打印异常。在生产环境中，日志是一个非常重要的监控手段，如果没有日志输出，无疑是非常危险的，此处也就引出了一个非常重要的工作--Datahub-monitor日志异常问题排查与修复。

5、排查日志，摆脱嫌疑

结合日志，可以确定定时任务每十分钟调度一次，故高并发查询与该定时调度任务无关。统计该任务每分钟的数据库访问量，结果如下。从下面的统计不难看出，数据库的访问十分平稳。

  时间   　次数
 18:00    2129
 18:01    2129
 18:02    2130
 18:03    2128
 18:04    2129
 18:05    2144
 18:06    2132
 18:07    2130
 18:08    2129
 18:09    2133
 18:10    2111
 18:11    2136
 18:12    2131
 18:13    2129
 18:14    2130
 18:15    2138

结合以上以及DBA的统计结果结果推测：数据库访问量增加的确与该服务有关，但不是主要原因。该服务每分钟都会有一个不大不小的访问量，一旦其他操作阻塞住了数据库，就会造成数据库短时连接数飙升。