報的異常如下
org.springframework.data.mongodb.UncategorizedMongoDbException: Interrupted acquiring a permit to retrieve an item from the pool ; nested exception is com.mongodb.MongoInterruptedException: Interrupted acquiring a permit to retrieve an item from the pool
at org.springframework.data.mongodb.core.MongoExceptionTranslator.translateExceptionIfPossible(MongoExceptionTranslator.java:138) ~[spring-data-mongodb-2.1.6.RELEASE.jar:2.1.6.RELEASE]
at org.springframework.data.mongodb.core.MongoTemplate.potentiallyConvertRuntimeException(MongoTemplate.java:2781) ~[spring-data-mongodb-2.1.6.RELEASE.jar:2.1.6.RELEASE]
at org.springframework.data.mongodb.core.MongoTemplate.execute(MongoTemplate.java:547) ~[spring-data-mongodb-2.1.6.RELEASE.jar:2.1.6.RELEASE]
at org.springframework.data.mongodb.core.MongoTemplate.doUpdate(MongoTemplate.java:1578) ~[spring-data-mongodb-2.1.6.RELEASE.jar:2.1.6.RELEASE]
at org.springframework.data.mongodb.core.MongoTemplate.doUpdate(MongoTemplate.java:1568) ~[spring-data-mongodb-2.1.6.RELEASE.jar:2.1.6.RELEASE]
at org.springframework.data.mongodb.core.MongoTemplate.updateFirst(MongoTemplate.java:1537) ~[spring-data-mongodb-2.1.6.RELEASE.jar:2.1.6.RELEASE]
at com.biyou.service.ArticleServiceImpl.flushWeight(ArticleServiceImpl.java:209) ~[classes/:na]
at com.biyou.OperationApplication.tast(OperationApplication.java:36) ~[classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_162]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_162]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_162]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_162]
at org.springframework.scheduling.support.ScheduledMethodRunnable.run(ScheduledMethodRunnable.java:84) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]
at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]
at org.springframework.scheduling.concurrent.ReschedulingRunnable.run(ReschedulingRunnable.java:93) [spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_162]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_162]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [na:1.8.0_162]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [na:1.8.0_162]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_162]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_162]
at java.lang.Thread.run(Thread.java:748) [na:1.8.0_162]
Caused by: com.mongodb.MongoInterruptedException: Interrupted acquiring a permit to retrieve an item from the pool
at com.mongodb.internal.connection.ConcurrentPool.acquirePermit(ConcurrentPool.java:203) ~[mongodb-driver-core-3.8.2.jar:na]
at com.mongodb.internal.connection.ConcurrentPool.get(ConcurrentPool.java:140) ~[mongodb-driver-core-3.8.2.jar:na]
at com.mongodb.internal.connection.DefaultConnectionPool.getPooledConnection(DefaultConnectionPool.java:262) ~[mongodb-driver-core-3.8.2.jar:na]
at com.mongodb.internal.connection.DefaultConnectionPool.get(DefaultConnectionPool.java:103) ~[mongodb-driver-core-3.8.2.jar:na]
at com.mongodb.internal.connection.DefaultConnectionPool.get(DefaultConnectionPool.java:92) ~[mongodb-driver-core-3.8.2.jar:na]
at com.mongodb.internal.connection.DefaultServer.getConnection(DefaultServer.java:85) ~[mongodb-driver-core-3.8.2.jar:na]
at com.mongodb.binding.ClusterBinding$ClusterBindingConnectionSource.getConnection(ClusterBinding.java:114) ~[mongodb-driver-core-3.8.2.jar:na]
at com.mongodb.operation.OperationHelper.withReleasableConnection(OperationHelper.java:424) ~[mongodb-driver-core-3.8.2.jar:na]
at com.mongodb.operation.MixedBulkWriteOperation.execute(MixedBulkWriteOperation.java:191) ~[mongodb-driver-core-3.8.2.jar:na]
at com.mongodb.operation.MixedBulkWriteOperation.execute(MixedBulkWriteOperation.java:67) ~[mongodb-driver-core-3.8.2.jar:na]
at com.mongodb.client.internal.MongoClientDelegate$DelegateOperationExecutor.execute(MongoClientDelegate.java:193) ~[mongodb-driver-3.8.2.jar:na]
at com.mongodb.client.internal.MongoCollectionImpl.executeSingleWriteRequest(MongoCollectionImpl.java:960) ~[mongodb-driver-3.8.2.jar:na]
at com.mongodb.client.internal.MongoCollectionImpl.executeUpdate(MongoCollectionImpl.java:951) ~[mongodb-driver-3.8.2.jar:na]
at com.mongodb.client.internal.MongoCollectionImpl.updateOne(MongoCollectionImpl.java:613) ~[mongodb-driver-3.8.2.jar:na]
at org.springframework.data.mongodb.core.MongoTemplate$8.doInCollection(MongoTemplate.java:1625) ~[spring-data-mongodb-2.1.6.RELEASE.jar:2.1.6.RELEASE]
at org.springframework.data.mongodb.core.MongoTemplate$8.doInCollection(MongoTemplate.java:1578) ~[spring-data-mongodb-2.1.6.RELEASE.jar:2.1.6.RELEASE]
at org.springframework.data.mongodb.core.MongoTemplate.execute(MongoTemplate.java:545) ~[spring-data-mongodb-2.1.6.RELEASE.jar:2.1.6.RELEASE]
... 19 common frames omitted
Caused by: java.lang.InterruptedException: null
at java.util.concurrent.locks.AbstractQueuedSynchronizer.tryAcquireSharedNanos(AbstractQueuedSynchronizer.java:1326) ~[na:1.8.0_162]
at java.util.concurrent.Semaphore.tryAcquire(Semaphore.java:409) ~[na:1.8.0_162]
at com.mongodb.internal.connection.ConcurrentPool.acquirePermit(ConcurrentPool.java:197) ~[mongodb-driver-core-3.8.2.jar:na]
... 35 common frames omitted
產生這個異常的原因在於,我項目中有一個定時任務 會定時改寫 數據庫里的文檔,其實就是定時刷新 文檔們的 權重分;
我 另外一個線程(比如說瀏覽器線程)在 讀 或 寫 某個文檔的 時候 ,兩個線程撞了, 一個線程是定時任務 ,剛好刷新到這個文檔, 一個線程剛好在讀 or 寫 這個文檔 就報這個異常,
這個異常不會規律重復出現,只是一個概率事件,
解決思路,一個是給 刷新權重分 的定時任務線程加鎖,避免線程相撞 ;同時降低定時任務的周期,降低線程相撞的概率;