欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  IT编程

MySQL案例02:(MyCAT报错) [ERROR][$_NIOREACTOR-3-RW] caught err: java.lang.OutOfM emo

程序员文章站 2023-08-12 21:29:26
上班坐下来没多久,接同事电话说有两台mysql服务器无法访问,其中这两台服务器是mycat服务器+MySQL服务器,具体处理过程如下: 一、错误信息 错误信息01: 错误信息02: 错误信息03: 二、错误原因 1、针对错误信息01,基本可以断定是由于服务器jvm设置不当,导致内存溢出。 2、针对错 ......

上班坐下来没多久,接同事电话说有两台mysql服务器无法访问,其中这两台服务器是mycat服务器+MySQL服务器,具体处理过程如下:

一、错误信息

错误信息01:

INFO   | jvm 3    | 2018/05/10 10:00:54 | 2018-05-10 10:00:54,406 [INFO ][$_NIOREACTOR-3-RW] close connection,reason:Bad: 
java.lang.OutOfMemoryError: Unable to acquire 131072 bytes of memory, got 0 ,MySQLConnection [id=6173, lastTime=1525917654
250, user=username, schema=database10, old shema=database10, borrowed=true, fromSlaveDB=true, threadId=42067, charset=utf8, txIsolation=3,
 autocommit=true, attachment=dn10{SELECT *
INFO   | jvm 3    | 2018/05/10 10:00:54 | FROM cu_link
INFO   | jvm 3    | 2018/05/10 10:00:54 | WHERE (customer_id = 1964
INFO   | jvm 3    | 2018/05/10 10:00:54 |               OR customer_link_id = 1964)
INFO   | jvm 3    | 2018/05/10 10:00:54 |       AND state = 1
INFO   | jvm 3    | 2018/05/10 10:00:54 |       AND company_id = '3BD'
INFO   | jvm 3    | 2018/05/10 10:00:54 | LIMIT 100000000}, respHandler=io.mycat.backend.mysql.nio.handler.MultiNodeQueryH
andler@530d01dc, host=xx.xx.xx.xx, port=3306, statusSync=null, writeQueue=0, modifiedSQLExecuted=false]  (io.mycat.net.
AbstractConnection:AbstractConnection.java:508) 
INFO   | jvm 3    | 2018/05/10 10:00:54 | 2018-05-10 10:00:54,407 [ERROR][$_NIOREACTOR-3-RW] caught err:  java.lang.OutOfM
emoryError: Unable to acquire 131072 bytes of memory, got 0
INFO   | jvm 3    | 2018/05/10 10:00:54 |       at io.mycat.memory.unsafe.memory.mm.MemoryConsumer.allocateLongArray(Memor
yConsumer.java:92)
INFO   | jvm 3    | 2018/05/10 10:00:54 |       at io.mycat.memory.unsafe.utils.sort.UnsafeInMemorySorter.<init>(UnsafeInM
emorySorter.java:114)
INFO   | jvm 3    | 2018/05/10 10:00:54 |       at io.mycat.memory.unsafe.utils.sort.UnsafeExternalSorter.<init>(UnsafeExt
ernalSorter.java:131)
INFO   | jvm 3    | 2018/05/10 10:00:54 |       at io.mycat.memory.unsafe.utils.sort.UnsafeExternalSorter.create(UnsafeExt
ernalSorter.java:98)
INFO   | jvm 3    | 2018/05/10 10:00:54 |       at io.mycat.memory.unsafe.utils.sort.UnsafeExternalRowSorter.<init>(Unsafe
ExternalRowSorter.java:64)
INFO   | jvm 3    | 2018/05/10 10:00:54 |       at io.mycat.sqlengine.mpp.DataNodeMergeManager.onRowMetaData(DataNodeMerge
Manager.java:249)
INFO   | jvm 3    | 2018/05/10 10:00:54 |       at io.mycat.backend.mysql.nio.handler.MultiNodeQueryHandler.fieldEofRespon
se(MultiNodeQueryHandler.java:643)
INFO   | jvm 3    | 2018/05/10 10:00:54 |       at io.mycat.backend.mysql.nio.MySQLConnectionHandler.handleFieldEofPacket(
MySQLConnectionHandler.java:192)
INFO   | jvm 3    | 2018/05/10 10:00:54 |       at io.mycat.backend.mysql.nio.MySQLConnectionHandler.handleData(MySQLConne
ctionHandler.java:118)
INFO   | jvm 3    | 2018/05/10 10:00:54 |       at io.mycat.net.handler.BackendAsyncHandler.offerData(BackendAsyncHandler.
java:36)
INFO   | jvm 3    | 2018/05/10 10:00:54 |       at io.mycat.backend.mysql.nio.MySQLConnectionHandler.handle(MySQLConnectio
nHandler.java:80)
INFO   | jvm 3    | 2018/05/10 10:00:54 |       at io.mycat.net.AbstractConnection.handle(AbstractConnection.java:263)
INFO   | jvm 3    | 2018/05/10 10:00:54 |       at io.mycat.net.AbstractConnection.onReadData(AbstractConnection.java:321)
INFO   | jvm 3    | 2018/05/10 10:00:54 |       at io.mycat.net.NIOSocketWR.asynRead(NIOSocketWR.java:190)
INFO   | jvm 3    | 2018/05/10 10:00:54 |       at io.mycat.net.AbstractConnection.asynRead(AbstractConnection.java:273)
INFO   | jvm 3    | 2018/05/10 10:00:54 |       at io.mycat.net.NIOReactor$RW.run(NIOReactor.java:102)
INFO   | jvm 3    | 2018/05/10 10:00:54 |       at java.lang.Thread.run(Thread.java:745)
INFO   | jvm 3    | 2018/05/10 10:00:54 |      (io.mycat.net.NIOReactor$RW:NIOReactor.java:132) 

错误信息02:

LIMIT 100000000}, packetId=1], host=xx.xx.xx.xx, port=3306, statusSync=null, writeQueue=0, modifiedSQLExecuted=false] frontend host:x.x.x.x/49657/username
2018-05-10 10:25:39.883  WARN [$_NIOREACTOR-2-RW] (io.mycat.backend.mysql.nio.handler.SingleNodeHandler.backConnectionErr(SingleNodeHandler.java:249)) - execute  sql err : errno:1146 Table 'cr.vacode' doesn't exist con:MySQLConnection [id=89, lastTime=1525919139870, user=username, schema=cr, old shema=cr, borrowed=true, fromSlaveDB=true, threadId=553442, charset=utf8, txIsolation=3, autocommit=true, attachment=dn00{SELECT *
FROM vaCode
ORDER BY id DESC

错误信息03:

java.sql.SQLNonTransientException:  find no Route:SELECT * FROM `database03`.`cain` LIMIT 0

二、错误原因

1、针对错误信息01,基本可以断定是由于服务器jvm设置不当,导致内存溢出。

2、针对错误信息02,基本可以断定是由于在数据库服务器新增表,没有配置在mycat中或由于MyCAT大小写配置和数据库服务器表名大小写配置有关

3、针对错误信息03,基本可以断定路由问题

三、解决方案

1、查看系统内存

[root@localhost ~]# free -g
             total       used       free     shared    buffers     cached
Mem:            15         15          0          5          0          6
-/+ buffers/cache:          8          6
Swap:            7          5          2

2、查看系统日志

[root@localhost logs]#vi /var/log/message

如果是OOM的话,系统日志会记录的。

3、查看数据库日志和mycat日志

[root@localhost logs]#vi /home/mysql/err.log

[root@localhost logs]# vi /usr/local/mycat/logs/mycat.log
[root@localhost logs]# [root@localhost logs]# vi /usr/local/mycat/logs/wrapper.log

4、查看监控情况

通过zabbix查看系统CPU、内存、SWAP使用情况

5、查看具体进程对应资源消耗

[root@localhost ~]# top -p 31665

MySQL案例02:(MyCAT报错) [ERROR][$_NIOREACTOR-3-RW] caught err:  java.lang.OutOfM emo

[root@localhost ~]# top -p 30388

MySQL案例02:(MyCAT报错) [ERROR][$_NIOREACTOR-3-RW] caught err:  java.lang.OutOfM emo

通过ps 查看系统进程的时候和top查看资源消耗的时候,发现居然还跑着oracle进程,而且其sga设置为8G,PGA设置的是2G

MySQL案例02:(MyCAT报错) [ERROR][$_NIOREACTOR-3-RW] caught err:  java.lang.OutOfM emo

这里看到实际设置的最大应用内存(21G+)已经超过了物理内存的实际最大值(15G),而写看到系统已经使用了swap分区(虽然现在看着还有7G左右的cache),说明

6、查看mycat的进程运行内存

下面的最大堆内存4G(具体使用情况可以通过jmap查看),单线程内存最大64M,最大的nio内存2G(DirectMemory是java nio引入的,直接以native的方式分配内存,不受jvm管理)

MySQL案例02:(MyCAT报错) [ERROR][$_NIOREACTOR-3-RW] caught err:  java.lang.OutOfM emo

查看其具体配置文件

[root@localhost mycat]# more /usr/local/mycat/conf/wrapper.conf

# Java Additional Parameters
#wrapper.java.additional.1=
wrapper.java.additional.1=-DMYCAT_HOME=.
wrapper.java.additional.2=-server
wrapper.java.additional.3=-XX:MaxPermSize=64M
wrapper.java.additional.4=-XX:+AggressiveOpts
wrapper.java.additional.5=-XX:MaxDirectMemorySize=2G
wrapper.java.additional.6=-Dcom.sun.management.jmxremote
wrapper.java.additional.7=-Dcom.sun.management.jmxremote.port=1984
wrapper.java.additional.8=-Dcom.sun.management.jmxremote.authenticate=false
wrapper.java.additional.9=-Dcom.sun.management.jmxremote.ssl=false
wrapper.java.additional.10=-Xmx4G
wrapper.java.additional.11=-Xms1G

# Initial Java Heap Size (in MB)
#wrapper.java.initmemory=3

# Maximum Java Heap Size (in MB)
#wrapper.java.maxmemory=64

# Application parameters.  Add parameters as needed starting from 1
wrapper.app.parameter.1=io.mycat.MycatStartup
wrapper.app.parameter.2=start

这里看内存设置还是正常范围内

7、最终解决方案

(由于开发联系我时,我测试数据库服务、MyCAT服务均正常,所以具体排查过程大致如上,后经与开发沟通,他们说是磁盘空间不足导致的,清理磁盘重启mycat问题解决)

8、资源统计

[root@localhost logs]# dstat -lrmc --top-io --top-mem --top-cpu
Terminal width too small, trimming output.
---load-avg--- --io/total- ------memory-usage----- ----total-cpu-usage---- ----most-expensive---- --most-expensive->
 1m   5m  15m | read  writ| used  buff  cach  free|usr sys idl wai hiq siq|     i/o process      |  memory process >
0.86 0.56 0.47|76.7   105 |8825M 7816k 6938M  181M|  4   1  92   3   0   0|init         16M  477k|mysqld      5789M>
0.86 0.56 0.47|1083   177 |8835M 7828k 6928M  181M| 30   4  47  19   0   1|mysqld      416k 4354k|mysqld      5789M>