Hi Brett, thank you for answering so fast!About the pool size, I had to use a pool that big because if not, the error would happen with more frequency. And since the application is already in production, was needed. The application doesn't have more than 4 simultaneously active users.After adding, instead of showing 'Executed rollback on connection', Hikari is logging a lot of times: 3731 HikariPool-1 connection adder DEBUG com.zaxxer.hikari.pool.HikariPool - HikariPool-1 - Added connection com.mysql.jdbc.JDBC4Connection@30987dbd. Until fails: 4315 HikariPool-1 connection adder DEBUG com.zaxxer.hikari.pool.HikariPool - HikariPool-1 - Added connection com.mysql.jdbc.JDBC4Connection@668c13ff8341 HikariPool-1 connection adder DEBUG com.zaxxer.hikari.pool.PoolBase - HikariPool-1 - Failed to create/setup connection: Could not create connection to database server.
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Attempted reconnect 3 times. Giving up.8343 HikariPool-1 connection adder DEBUG com.zaxxer.hikari.pool.HikariPool - HikariPool-1 - Cannot acquire connection from data sourcecom.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server.
Attempted reconnect 3 times. There are many issues here.If you want to use Hikari, you should not provide these properties:.Looks like you activated.
Sep 30, 2015 「1030:プロトコルドライバーのエラー」メッセージが表示されます。 原因 「1030:プロトコルドライバーのエラー」というエラーは、さまざまな原因で発生します。以下に示す各項目を確認してください。.
That's a a bad idea.at org.hibernate.collection.internal.AbstractPersistentCollection.withTemporarySessionIfNeeded(AbstractPersistentCollection.java:249).You don't need to set this property: Why did you activate it? The connection should be closed when the transaction is ended, which is how RESOURCELOCAL should work. You need to remove this property and use the default mode.This exception shows that you are running out of connections: Data source rejected establishment of connection, message from server: 'Too many connections'Maybe the pool is set to a higher value than what the database can offer.This one: Connection is not available, request timed out after 30004ms.might indicate some long-running transactions.Use to get a better understanding of what happens inside your application when it comes to connection management. Thank you for answering!1 - I provide those properties because in HikariCP Github's page is written:The MySQL DataSource is known to be broken with respect to network timeout support. Use jdbcUrl configuration instead.Before using this, I was using datasource properties and the issue was also happening.
That's why I changed to jdbc (Since I was getting some time out errors, I thought that would fix it).2 - I didn't activated. But now I explicit defined to false.3 - Was suggestion!
Haha, Anyway, I had tried without it, and the main difference is shown.4 - My database max connections is defined to 200. And even with maxpools defined to 10 or 20 the error keeps happening.5 - I don't think that is it. My timeouts are defined to higher values and that happens in different situations. There's not a pattern regarding queries.I will try to use FlexyPool. Before using this, I was using datasource properties and the issue was also happening.
That's why I changed to JDBC (Since I was getting some time out errors, I thought that would fix it).Nope. Using a non-CP is not really a fix for your issue.I didn't activated. But now I explicit defined to false.Weird how you got that enabled explicitly.My database max connections is defined to 200. And even with maxpools defined to 10 or 20 the error keeps happening.200 connections?
That's way too much. Unless you have 64 cores, Intel Octane drives, and 128 GB of RAM, I think you should lower the total amount of connections to 2x the number of cores. Use the to tune that.I don't think that is it. My timeouts are defined to higher values and that happens in different situations. There's not a pattern regarding queries.Use.
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You do have integration tests for all your data access code, right? Unfortunately I don't have any tests. It's a legacy project, I'm doing some improvements but since when I migrate the project from a local windows server to a cloud linux server, and inserted HikariCP instead of C3P0, those problems start happening.The default MySQL max connections is 150. I had set to 200 just because the problem I sad before.For example, today I leaved the software running all day in production. HikariCP's housekeeper logs is: 35168946 HikariPool-1 housekeeper DEBUG com.zaxxer.hikari.pool.HikariPool - HikariPool-1 - Before cleanup stats (total=117, active=112, idle=5, waiting=0)35168946 HikariPool-1 housekeeper DEBUG com.zaxxer.hikari.pool.HikariPool - HikariPool-1 - After cleanup stats (total=117, active=112, idle=5, waiting=0)And MySQL's threads is: Threadsconnected:6Threadscreated: 131Threadsrunning: 1(5 from idle and 1 is me, connected remotely)Those 112 active from Hikari, shouldn't they being released? (Since in MySQL there's no extra running/connected threads).
If HikariCP is showing 117 connections, and MySQL is showing 5, the same as the HikariCP idle count, this is a clear case of a connection leak.If the application was run all day, and was actively used, then leaking 112 connections is not such a severe leak. A bad leak can exhaust the pool in seconds. However, when the connections hit the top of the pool, the application is effectively dead.There is nothing to do except enable the leakDetectionThreshold, set to something generous like 1 minute, and find and fix the leaks.C3p0 does not track resources and will allow you to abandon connections, HikariCP will not. As I said before, you need a way to figure out how the connections are leaked, and the easiest way to do it is with integration testsUse.Trying to figure it out at runtime where you have concurrency is much more difficult to pinpoint the culprit. Most likely, you need to make sure connections are closed properly if you acquire them manually.If you don't acquire JDBC connections explicitly, then you need to make sure you use the proper combination of Spring, Hibernate, HikariCP, JDBC driver. Maybe there is a conflict between your dependencies which causes an implicit connection leak. Hello.Did this problem find a solution?
I am having a similar problem at the moment myself. I am running integration tests and each test that spins up the spring context starts 9 or 10 connection to my Postgres database but does not close them after the test finishes and the spring context is closed. That means that if i run around 10 integration tests, each of which spins up its own Spring context, then the number of connections adds up to around 100, which is the limit for my database and all following tests fail.Using Spring, Hikari, Hibernate, Postgres.Any help would be highly appreciated. The properties seem fine. Anyway, you need to read the previous messages about using FlexyPool and to see where the connection leak come from.I noticed you are using Hibernate 4, which used a different connection management mechanism than Hibernate 5.
I'm not sure if that's covered as well in Spring. You have to investigate it and see what exactly is causing this connection leak.You could try upgrading to Hibernate 5.3 and a newer Spring version and see if the issue still replicates. Maybe it was a bug that was fixed. Hibernate 4 is quite old, and a lot of done ever since. You can also investigate using: SET SESSION netreadtimeout =;SET SESSION netwritetimeout =;Documentation. You can even investigate using a very short waittimeout, the default is 28800 seconds. These can be set through the connectionInitSql property, with all statements in a single string, semi-colon separated.Whatever value you set for.
waittimeout., I recommend setting the HikariCP maxLifetime property to several seconds less. In general, I would recommend setting waittimeout to several minutes, at minimum - maybe somewhere between 2-5 minutes.The netxxxtimeout values should probably cover most network interruptions, and should be roughly 3x your longest running transaction time, as a safety margin.See also my on Rapid Recovery. Hi, i think i have found the reason why my connections are stacking up, by looking at the error logs below i see a pattern where connection is added every thirty minutes and due to some communication link failure the newly added connection does not work and thus HikariCP tries to add a new connection immediately, again this happens whenever a communication link failure occurs. Any suggestions?
2018-12-12 13:05:37 DEBUG HikariPool:709 -call - PHAHikariCP - Added connection com.mysql.cj.jdbc.ConnectionImpl@3225f0f32018-12-12 13:09:46 WARN PoolBase:175 -isConnectionAlive - PHAHikariCP - Failed to validate connection com.mysql.cj.jdbc.ConnectionImpl@3225f0f3 (Communications link failureThe last packet successfully received from the server was 248,909 milliseconds ago. The last packet sent successfully to the server was 5,016 milliseconds ago.)2018-12-12 13:09:46 DEBUG PoolBase:129 -quietlyCloseConnection - PHAHikariCP - Closing connection com.mysql.cj.jdbc.ConnectionImpl@3225f0f3: (connection is dead)2018-12-12 13:09:46 DEBUG PoolBase:138 -quietlyCloseConnection - PHAHikariCP - Closing connection com.mysql.cj.jdbc.ConnectionImpl@3225f0f3 failedcom.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failureThe last packet successfully received from the server was 248,909 milliseconds ago.
When a Citrix ICA client connects to a Citrix Presentation Server, it either uses TCP/IP port 2598 or port 1494. Port 2598 is used with session reliability and.Citrix Deployments This document describes how to deploy Acrobat products on a Citrix server for streaming to Windows machines. It provides details about product.Trouble shooting the Citrix error/ICA message: protocol driver errorI think this is a rather poor chosen error message. Protocol driver error within a Citrix environment can mean so many things. But it comes down to this: the client cannot find the server.
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