Data reload from persistent disk store is not working after restart - ehcache 3 -spring boot 1.5.6

[mahmoud romeh]

Dears ,
I am facing an issue with ehcache 3 disk persistance reload after restart when i am using it with spring boot app :

the xml configuration :

• attachement : ehcache.xml
  

the spring boot configuration :

• attachmnet : CachingConfiguration.java
  

sprint boot app main enable caching annotation

• attachmnet : AlertManagerApplication
  

after I add in the runtime some data objects then restart the app from IDEA , when i query for those data , it is empty all the time i try that , why the cache is cleared upoan restart ? what i am doing wrong ?

ehCache version : 

3.3.1 

Spring boot version : spring boot 1.5.6

[Anthony Dahanne]

Hello,

it looks like you have never configured the disk tier, I can only see onheap and offheap tiers configuration in your xml.

You need to configure a diskTier to have persistent caches (that said, they'll only be persistent as long as your JVM does not crash)

Like this for example :

<resources>
    <heap unit="entries">1000</heap>
    <disk unit="MB" persistent="true">10</disk>

</resources> 

HTH,
Anthony

[Anthony Dahanne]

ah, you'll also need to configure the persistence :

<persistence directory="cachingPersistence"/>

[mahmoud romeh]

Dear Anthony,

Thanks for your response ,actually it was wrong file i have uploaded for the ehcache xml , here is the correct one which already contain all the remarks you have mentioned but still same issue no data load after restart .

I do not know what else i could have done wrong.

Thx a lot

[Anthony Dahanne]

Hello Mahmoud,

Have you located the cache folder ? Does it remain empty ? When you restart your JVM, is it still taking some disk space ?

As it is the authoritative tier, it should start growing as soon as you put elements into the caches that are using it.

Anthony

[mahmoud romeh]

Hi Anthony ,

yes i see the cache folder is created and the file size is increasing when I add the data but when I restart the app i see the file size is decreased again which tell me the file data is wiped out when the restart happen , i have attached the file size during running and then after the restart , what leads the file data to be cleared upon restart.

Thanks a lot,
Romeh

[mahmoud romeh]

also in the startup logs i see the following :[2017-08-16 13:18:25]
[main] INFO  org.ehcache.core.EhcacheManager - Cache 'AlertsConfig' created in Eh107InternalCacheManager.
[2017-08-16 13:18:25] [main] DEBUG org.ehcache.core.EhcacheManager - Creating Cache 'Alerts' in Eh107InternalCacheManager.
[2017-08-16 13:18:25] [main] DEBUG o.ehcache.impl.persistence.FileUtils - Reusing C:\Dev\projects\alert-manager\.\cache\file
[2017-08-16 13:18:25] [main] DEBUG o.ehcache.impl.persistence.FileUtils - Reusing C:\Dev\projects\alert-manager\.\cache\file\Alerts_d0efe0b2c75c1c670b3146f5f276e23a667f15ec
[2017-08-16 13:18:25] [main] DEBUG o.e.i.i.s.s.DefaultSerializationProvider - Serializer for <java.lang.Object> : org.ehcache.impl.serialization.PlainJavaSerializer@682af059
[2017-08-16 13:18:25] [main] DEBUG o.e.i.i.s.s.DefaultSerializationProvider - Serializer for <java.lang.Object> : org.ehcache.impl.serialization.PlainJavaSerializer@5f36c8e3
[2017-08-16 13:18:25] [main] DEBUG o.e.i.i.spi.copy.DefaultCopyProvider - Copier for <java.lang.Object> : org.ehcache.impl.copy.IdentityCopier@4da39ca9
[2017-08-16 13:18:25] [main] DEBUG o.e.i.i.spi.copy.DefaultCopyProvider - Copier for <java.lang.Object> : org.ehcache.impl.copy.IdentityCopier@6a9344f5
[2017-08-16 13:18:25] [main] DEBUG o.ehcache.impl.persistence.FileUtils - Reusing C:\Dev\projects\alert-manager\.\cache\file\Alerts_d0efe0b2c75c1c670b3146f5f276e23a667f15ec\offheap-disk-store
[2017-08-16 13:18:25] [main] INFO  o.t.o.p.UpfrontAllocatingPageSource - Allocating 1MB in chunks
[2017-08-16 13:18:25] [pool-2-thread-1] DEBUG o.t.o.p.UpfrontAllocatingPageSource - 1MB chunk allocated
[2017-08-16 13:18:25] [main] DEBUG o.t.o.p.UpfrontAllocatingPageSource - Took 1 ms to create off-heap sto

So he see the cache file , but it is clearing its content out upon start , is it maybe due to an error in cache manager close with spring boot ?

[Henri Tremblay]

Are you doing a clean shutdown? Closing the cache manager before shutdown.

Because, without a clean shutdown the disk is systematically wiped.

Only the enterprise disk persistence provides resiliency over crash.

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[mahmoud romeh]

yes , i am following all exmaples about spring boot like : https://github.com/ehcache/ehcache3-samples/blob/master/fullstack/src/main/java/org/terracotta/demo/config/CacheConfiguration.java

the issue i see the index file created at starting time sometimes , and when i stop the application , delete the cache folder , start again  i do not see the index file being created

What can make the index file not be created during startup ?

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[Anthony Dahanne]

Mahmoud,

I've created  a sample project there : https://github.com/anthonydahanne/ehcache3-disk-persistence-demo

Please have a look and start / restart it ; you'll see previous cache mapping being restored on restart.

HTH

Anthony

[mahmoud romeh]

Hi Anthony ,

Thanks a lot for your demo project , I have used the same setup locally and still can not have the index file being created , please be informed i am using spring boot web module as well so maybe for properly closing the cache manager we need to do something uplon web app closing on embeded tomcat , i do not know.

I have created a github project from my local try you to make your life much easier : https://github.com/Romeh/springboot-web-echache3Persistance

thx a lot

[Henri Tremblay]

I just tried your app and it works perfectly.

I have added this in CacheDataLoader:

System.out.println("Already loaded");
for(Cache.Entry<String, AlertConfigEntry> entry : alertsConfig) {
    System.out.println(entry.getKey() + ":" + entry.getValue());
}

If I start the app, the first time, this cache is empty.

If I stop the app (and see the log "org.ehcache.core.EhcacheManager - Close successful"), and relaunch it, the content is still there as expected.

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[mahmoud romeh]

Thanks Henry for your reply , i will double check my file system permissions then and i will let you know.

thanks a lot,
Romeh