Item Expired by cache while locked

chunhui · **Joined:** Thu Jun 01, 2006 2:20 pm **Posts:** 2

Hi,
I was running a batch job to persist and merge about 32000 rows of data (each row corresponds to 1 parent object with about 5 associations).

The batch completed successfully in about 2100 seconds, but I got a lot of warnings after the job completes:

Code:

WARN  ReadWriteCache - An item was expired by the cache while it was locked (increase your cache timeout): someObject#xxxxxxx
WARN  ReadWriteCache - An item was expired by the cache while it was locked (increase your cache timeout): someObject#xxxxxxx
WARN  ReadWriteCache - An item was expired by the cache while it was locked (increase your cache timeout): someObject#xxxxxxx
.....
.....
.....

The data seems to be persisted in the DB correctly.

What is the impact of this and how do we get rid of the warnings?

the warning says (increase your cache timeout), but my ehcache is set to eternal=true.

Here's my ehcache.xml

Code:

<ehcache>
    <diskStore path="java.io.tmpdir"/>
    <defaultCache
            maxElementsInMemory="100000000"
            eternal="true"
            overflowToDisk="false"
            timeToIdleSeconds="0"
            timeToLiveSeconds="0"
            diskPersistent="false"
            diskExpiryThreadIntervalSeconds="120"
            />
</ehcache>

I've also tried setCacheMode(CacheMode.IGNORE) but Warnings are still there...[/code]

anshuiitk · **Joined:** Tue May 18, 2010 5:39 am **Posts:** 19

The warning has no impact on the current db action (insert, update, delete). Its basically a cache miss. However with the next transaction the object will be loaded from the db, and this is a db overhead.

Hence options are :

1. increase your cache size if possible.
2. or use a deterministic evictor to avoid (can still occur) the problem by specifying the java -Dnet.sf.ehcache.use.classic.lru=true system property while starting your application.
3. Or use memoryStoreEvictionPolicy="LRU" in your ehcache xml.

Read more about it at : http://ehcache.org/EhcacheUserGuide.html#id.s27.8.8