我有一個(gè)

Quartz作業(yè)，每5分鐘一次在MySQL數(shù)據(jù)庫(kù)中執(zhí)行一個(gè)存儲(chǔ)過(guò)程，由于某種原因，3個(gè)執(zhí)行中有1個(gè)失敗，并提供了這個(gè)奇怪的異常。我搜索并搜索了這個(gè)異常是什么意思，但是我找不到解決方案。這是完整的堆棧跟蹤：

java.sql.SQLException: Could not retrieve transation read-only status server

at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1078)

at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:989)

at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:975)

at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:920)

at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:951)

at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:941)

at com.mysql.jdbc.ConnectionImpl.isReadOnly(ConnectionImpl.java:3939)

at com.mysql.jdbc.ConnectionImpl.isReadOnly(ConnectionImpl.java:3910)

at com.mysql.jdbc.PreparedStatement.checkReadOnlySafeStatement(PreparedStatement.java:1258)

at com.mysql.jdbc.CallableStatement.checkReadOnlySafeStatement(CallableStatement.java:2656)

at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1278)

at com.mysql.jdbc.CallableStatement.execute(CallableStatement.java:920)

at com.mchange.v2.c3p0.impl.NewProxyCallableStatement.execute(NewProxyCallableStatement.java:3044)

at org.deadmandungeons.website.tasks.RankUpdateTask.execute(RankUpdateTask.java:30)

at org.quartz.core.JobRunShell.run(JobRunShell.java:202)

at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:573)

Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet successfully received from the server was 1,198,219 milliseconds ago. The last packet sent successfully to the server was 950,420 milliseconds ago.

at sun.reflect.GeneratedConstructorAccessor43.newInstance(Unknown Source)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

at java.lang.reflect.Constructor.newInstance(Constructor.java:526)

at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)

at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1121)

at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3673)

at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3562)

at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4113)

at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2570)

at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2731)

at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2812)

at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2761)

at com.mysql.jdbc.StatementImpl.executeQuery(StatementImpl.java:1612)

at com.mysql.jdbc.ConnectionImpl.isReadOnly(ConnectionImpl.java:3933)

... 9 more

Caused by: java.net.SocketException: Connection timed out

at java.net.SocketInputStream.socketRead0(Native Method)

at java.net.SocketInputStream.read(SocketInputStream.java:150)

at java.net.SocketInputStream.read(SocketInputStream.java:121)

at com.mysql.jdbc.util.ReadAheadInputStream.fill(ReadAheadInputStream.java:114)

at com.mysql.jdbc.util.ReadAheadInputStream.readFromUnderlyingStreamIfNecessary(ReadAheadInputStream.java:161)

at com.mysql.jdbc.util.ReadAheadInputStream.read(ReadAheadInputStream.java:189)

at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:3116)

at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3573)

... 17 more

所以我認(rèn)為這是超時(shí)的，因?yàn)樗J(rèn)為MySQL服務(wù)器處于只讀狀態(tài)？

這只會(huì)發(fā)生在這個(gè)石英作業(yè)中，而不是與數(shù)據(jù)庫(kù)通信的任何其他時(shí)間。這個(gè)執(zhí)行當(dāng)然是在另一個(gè)線程中發(fā)生的，但是我不認(rèn)為這與它有任何關(guān)系。

為什么會(huì)認(rèn)為服務(wù)器處于只讀模式？

此外，我不認(rèn)為“轉(zhuǎn)換”是一個(gè)字，所以有…

總結(jié)

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