我正在使用 Grails 2.4.4、mongo 插件 3.0.2、MongoDB 2.4.10 使用远程数据库连接。
grails {
mongo {
host = "11.12.13.14" // A remote server IP
port = 27017
databaseName = "blogger"
username = "blog"
password = "xyz"
options {
autoConnectRetry = true
connectTimeout = 3000
connectionsPerHost = 40
socketTimeout = 120000
threadsAllowedToBlockForConnectionMultiplier = 5
maxAutoConnectRetryTime=5
maxWaitTime=120000
}
}
}
在我们应用程序的一部分中,服务方法迭代 20,000 多个用户并向他们发送一封电子邮件:
Person.withCriteria { // Line 323
eq("active", true)
order("dateJoined", "asc")
}.each { personInstance ->
// Code to send an email which takes an average of 1 second
}
对大约 6000 个用户执行此操作后,我收到 MongoDB 游标异常:
2015-04-11 07:31:14,218 [quartzScheduler_Worker-1] ERROR listeners.ExceptionPrinterJobListener - Exception occurred in job: Grails Job
org.quartz.JobExecutionException: com.mongodb.MongoException$CursorNotFound: Cursor 1337814790631604331 not found on server 11.12.13.14:27017 [See nested exception: com.mongodb.MongoException$CursorNotFound: Cursor 1337814790631604331 not found on server 11.12.13.14:27017]
at grails.plugins.quartz.GrailsJobFactory$GrailsJob.execute(GrailsJobFactory.java:111)
at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:573)
Caused by: com.mongodb.MongoException$CursorNotFound: Cursor 1337814790631604331 not found on server 11.12.13.14:27017
at com.mongodb.QueryResultIterator.throwOnQueryFailure(QueryResultIterator.java:218)
at com.mongodb.QueryResultIterator.init(QueryResultIterator.java:198)
at com.mongodb.QueryResultIterator.initFromQueryResponse(QueryResultIterator.java:176)
at com.mongodb.QueryResultIterator.getMore(QueryResultIterator.java:141)
at com.mongodb.QueryResultIterator.hasNext(QueryResultIterator.java:127)
at com.mongodb.DBCursor._hasNext(DBCursor.java:551)
at com.mongodb.DBCursor.hasNext(DBCursor.java:571)
at org.grails.datastore.mapping.mongo.query.MongoQuery$MongoResultList$1.hasNext(MongoQuery.java:1893)
at com.test.person.PersonService.sendWeeklyEmail(PersonService.groovy:323)
at com.test.WeeklyJob.execute(WeeklyJob.groovy:41)
at grails.plugins.quartz.GrailsJobFactory$GrailsJob.execute(GrailsJobFactory.java:104)
... 2 more
我查了一下文档,发现游标在20分钟后自动关闭,当我用日志确认时,这个异常正好在20分钟后出现。
但是这种 20 分钟后自动关闭的行为适用于非活动光标,但这里光标是活动的。
UPDATE:
我读了一些文章,发现这可能是 TCP keepalive 超时的问题。所以我们将TCP keepalive超时从默认的2小时更改为2分钟,但仍然没有解决问题。