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ehcache LRU evicting recently used entries


ehcache LRU evicting recently used entries

By : mc1100
Date : October 26 2020, 11:52 AM
this one helps. i guess i found the cause.
some time ago i upgraded ehcache from 1.6.xx to 1.7.xx. i didn't noticed that they changed implementation of evicting algorithm. now it works as follows: select random 15 keys(!, they use some heuristics, but nevertheless it is still random), then find corresponding elements, select last recently used element from selected ones. (you can figure out it by yourself after looking a MemoryStore class). after that not surprising that it works very very bad.
code :


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Google Guava Cache evicting entries for SIZE when no maxSize specified

Google Guava Cache evicting entries for SIZE when no maxSize specified


By : Camol Sparta
Date : March 29 2020, 07:55 AM
should help you out Is it possible that your expirationInterval is accidentally equal to zero? As expireAfterAccess documents, "When duration is zero, this method hands off to maximumSize(0)."
ehcache hibernate second level caching, hibernate evicting automatically

ehcache hibernate second level caching, hibernate evicting automatically


By : Karthik Sripal J
Date : March 29 2020, 07:55 AM
this will help found the Hibernate Issue https://hibernate.onjira.com/browse/HHH-2224
I tested with the bellow :
code :
<sql-query name="random_write_query" callable="false">
        <synchronize table="USER"/>
        <synchronize table="USER_ADDRESS"/>
        {CALL PACKAGE.FUNCTION(?)}
</sql-query>
<sql-query name="random_read_query">
         <synchronize table="USER"/>
         <synchronize table="USER_ADDRESS"/>
         <return-scalar column="USERNAME" type="string"/>
        <![CDATA[
            SELECT USERNAME FROM USER, USER_ADDRESS...
        ]]>
    </sql-query>
How to avoid evicting entries from Guava Cache

How to avoid evicting entries from Guava Cache


By : Lisa Burnett
Date : March 29 2020, 07:55 AM
may help you . I'm using Guava Cache to cache about 100K records in memory. I use cache.putAll(Map) to pre-load the cache. After loading about 20K records, I see removal notifications with cause 'REPLACED'. Max size is 1GB and weigher returns 1 for all entries, expireAfterAccess is 24 hours. 1GB is enough for all records. How can I ensure that no entry is replaced before 24 hrs ? , My guess is that you might be adding duplicate keys.
UPDATE
code :
ReferenceEntry<K, V> getNextEvictable() {
  for (ReferenceEntry<K, V> e : accessQueue) {
    int weight = e.getValueReference().getWeight();
    if (weight > 0) {
      return e;
    }
  }
  throw new AssertionError();
}
Ehcache: unexpected behavior when evicting cache elements

Ehcache: unexpected behavior when evicting cache elements


By : user3672771
Date : March 29 2020, 07:55 AM
will be helpful for those in need According to the logs, there are only two invalidatings made in thread http-nio-8080-exec-7:
code :
2020-02-10 16:48:32.695 [http-nio-8080-exec-7] TRACE o.s.c.i.CacheInterceptor - Invalidating cache key [getImageUserLayer:5510461] for operation Builder[public void com.prognoz.smkoob.data.dao.meta.UserLayerServiceImpl.updateLayer(com.prognoz.smkoob.domain.UserLayer.UserLayer,int)] caches=[cacheStatic] | key=''getImageUserLayer'.concat(':').concat(#layerId)' | keyGenerator='' | cacheManager='' | cacheResolver='' | condition='',false,false on method public void com.prognoz.smkoob.data.dao.meta.UserLayerServiceImpl.updateLayer(com.prognoz.smkoob.domain.UserLayer.UserLayer,int)
2020-02-10 16:48:32.701 [http-nio-8080-exec-7] TRACE o.s.c.i.CacheInterceptor - Invalidating cache key [getLastModifiedUserLayer:5510461] for operation Builder[public void com.prognoz.smkoob.data.dao.meta.UserLayerServiceImpl.updateLayer(com.prognoz.smkoob.domain.UserLayer.UserLayer,int)] caches=[cacheStatic] | key=''getLastModifiedUserLayer'.concat(':').concat(#layerId)' | keyGenerator='' | cacheManager='' | cacheResolver='' | condition='',false,false on method public void com.prognoz.smkoob.data.dao.meta.UserLayerServiceImpl.updateLayer(com.prognoz.smkoob.domain.UserLayer.UserLayer,int)

2020-02-10 16:48:33.909 [http-nio-8080-exec-3] TRACE o.s.c.i.CacheInterceptor - Computed cache key 'getLastModifiedUserLayer:4900061' for operation Builder[public java.lang.String com.prognoz.smkoob.data.dao.ImageServiceImpl.getLastModifiedUserLayer(int)] caches=[cacheStatic] | key=''getLastModifiedUserLayer'.concat(':').concat(#layerId)' | keyGenerator='' | cacheManager='' | cacheResolver='' | condition='' | unless='' | sync='false'
2020-02-10 16:48:33.909 [http-nio-8080-exec-3] TRACE o.s.c.i.CacheInterceptor - No cache entry for key 'getLastModifiedUserLayer:4900061' in cache(s) [cacheStatic]
Hibernate/Ehcache: evicting collections from 2nd level cache not synchronized with other DB reads

Hibernate/Ehcache: evicting collections from 2nd level cache not synchronized with other DB reads


By : Ankush Mahajan
Date : March 29 2020, 07:55 AM
may help you . Essentially what you need to do is to force a read from the database in the event that a collection is in the process of or has just been evicted. One way to do this would be to mark the collection as dirty as soon as a request to evict it has been received but before entering the transaction to change it. Any concurrent transaction which comes along will check the dirty flag and if its set to true, it should get the data from the database otherwise it can read from the cache. You might need to change your DB transaction settings so that concurrent transactions block till the one updating the data finishes so that correct data is read from the DB. Once the transaction finishes, you can then reset the dirty flag to false.
You can also create a lock on the cached collection when an update, insert or delete is due for as long as the eviction lasts. This will ensure that no other transaction can read/change the cached collection till the eviction process finishes.
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