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https://issues.apache.org/jira/browse/SOLR-667?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12618824#action_12618824
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Fuad Efendi commented on SOLR-667:
----------------------------------
Thanks Yonik, I even guess that in some cases synchronization is faster than
sun.misc.Unsafe.compareAndSwapLong(this, valueOffset, expect, update);
{code}
public final long incrementAndGet() {
for (;;) {
long current = get();
long next = current + 1;
if (compareAndSet(current, next))
return next;
}
}
{code}
- extremal level of safety with some level of concurrency... Do we need exact
value for 'stats.inserts' (if it is not synchronized)?
It can be 'long' inside synchronized block...
> Alternate LRUCache implementation
> ---------------------------------
>
> Key: SOLR-667
> URL: https://issues.apache.org/jira/browse/SOLR-667
> Project: Solr
> Issue Type: New Feature
> Components: search
> Affects Versions: 1.3
> Reporter: Noble Paul
> Attachments: ConcurrentLRUCache.java
>
>
> The only available SolrCache i.e LRUCache is based on _LinkedHashMap_ which
> has _get()_ also synchronized. This can cause severe bottlenecks for faceted
> search. Any alternate implementation which can be faster/better must be
> considered.
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