Getting null for newly added elements in Cache.

[kuldeep9922]

Here's the map configuration:

<hz:map name="cacheName"
                    backup-count="1"
                    max-size="10000"
                    eviction-percentage="0"
                    read-backup-data="true"
                    eviction-policy="LRU"
                    merge-policy="com.hazelcast.map.merge.LatestUpdateMapMergePolicy"
                    time-to-live-seconds="0"
                    >
</hz:map>

After reaching max-size of 10000, it starts return null object for newly added values in cache. There seems to be some problem with eviction in hazel-cast. How can I fetch newly added values?

[ahmetmircik]

Hi @kuldeep9922,

This is a known issue #4334 and scheduled to fix in 3.7. As a workaround you can increase eviction-percentage to a higher number (for example 25) and listen local entry evicted events if the evicted key is a fresh key, you can try to put it again into IMap. (Btw, i didn't try this workaround, only i thought it may work)

[kuldeep9922]

Hi @ahmetmircik,

Thanks for the reply. We already tried this workaround and it's not working. Is there any other way possible as of now?

[ahmetmircik]

Hi, it will be fixed in 3.7. As an other alternative, if you can use jcache instead of imap, this problem should not be happen.

[d123456temp]

This is definitely NOT fixed for the LRU strategy. Newly added items are still being evicted straight away before really old entries when Map is working at almost-full size (so it reached max-elements-count).
This is the first bad experience I had with HAzelcast. It would be a shame as this is pretty much very important, basic functionality that should work without any issues.