Having an issue with ElastiCache Redis using Lucee 5 3 9 166 cfml #lucee

Having an issue with ElastiCache Redis using Lucee...

Dean

12/16/2022, 1:57 AM

Having an issue with ElastiCache Redis using Lucee 5.3.9.166 extension 3.0.0.46 Running the following

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<cfquery name ="test" datasource="#mydsn#" tags="mytag" cachedwithin="#createTimespan(1,0,0,0)#">
    select * from myTable
</cfquery>
<cfscript>
    writedump(var=test, expand=false)
    cacheClear(filter=listToArray("mytag"),cachename= 'querycache')
</cfscript>

I get:

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lucee.runtime.exp.NativeException: java.lang.NullPointerException 
at lucee.runtime.cache.util.QueryTagFilter.accept(QueryTagFilter.java:27) 
at lucee.extension.io.cache.redis.CacheSupport.remove(CacheSupport.java:88) 
at lucee.runtime.functions.cache.CacheClear._call(CacheClear.java:111) 
at lucee.runtime.functions.cache.CacheClear.call(CacheClear.java:69) 
at dean_cfm$cf$i.call(/dean.cfm:3)

It only seems to happen with ElastiCache, if I use a local docker container, with the same Redis version, I dont get the error and the cacheClear removes the correct query from the cache. Happy to do more testing if someone can tell me why its throwing a NullPointerException in the QueryTagFilter.

Dean

12/16/2022, 5:35 AM

Ive managed to replicate this thanks to our good friends at FusionReactor. Looks to be when an item is removed from the cache while the iterator is looping through the cache items looking for tagged items to remove. Ive replicated by pausing at

key = (String)it.next();

, removing an item from the cache, then stepping it to

while(filter != null && !filter.accept(entry));

where it throws. ElastiCache isnt the problem, its doing lots of cache invalidations from a fleet of servers constantly, so it's just a timing thing where one server is trying to invalidate a set of cache items and another server removes an item it is about to loop through. If I can figure out how to build the Redis extension I'll try push through a PR

Dean

12/16/2022, 6:46 AM

This seems to have done the trick

zackster

12/16/2022, 8:31 AM

nice digging, can you file a bug in jira?

zackster

12/16/2022, 8:32 AM

to build the extension locally, just install and run ant in the root dir

Dean

12/16/2022, 8:37 AM

All sorted, have a version in testing now 😁