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https://issues.apache.org/jira/browse/IGNITE-26758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18041773#comment-18041773
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Kirill Anisimov commented on IGNITE-26758:
------------------------------------------
h3. *Where it is used*
The field is declared and utilized exclusively in
modules/core/src/main/java/org/apache/ignite/internal/processors/cache/query/GridCacheQueryManager.java.
It appears in the following methods:
h4. Declaration
```private volatile ConcurrentMap<Object, CachedResult<?>> qryResCache = new
ConcurrentHashMap<>(); ```
Before it, it looked like this:
```private volatile ConcurrentMap<Object, CachedResult<?>> qryResCache = new
ConcurrentHashMap8<>();```
But was changed in +*IGNITE-7513*+
Purpose: Thread-safe map for storing temporary query results.
h4.
Usage in the code
# invalidateResultCache() (private method):
Called to clear the cache after data mutations to ensure consistency.
```
private void invalidateResultCache() {
if (!qryResCache.isEmpty())
qryResCache = new ConcurrentHashMap<>();
}```
# executeFieldsQuery(...) (private method):
Core usage for caching and deduplicating concurrent SQL fields queries. Key is
based on query clause and arguments.
```
// Attempt to get result from cache.
T2<String, List<Object>> resKey = new T2<>(qry.clause(), F.asList(args));
FieldsResult res = (FieldsResult)qryResCache.get(resKey);
if (res != null && res.addRecipient(rcpt))
return res; // Cached result found.
res = new FieldsResult(rcpt);
if (qryResCache.putIfAbsent(resKey, res) != null)
resKey = null; // Failed to cache result.
if (resKey != null)
qryResCache.remove(resKey, res);
return res;
}```
# store(...) (public method):
Invalidates cache after storing data.
```
finally {
invalidateResultCache();
leaveBusy();
}```
# remove(...) (public method):
Similar to store, invalidates cache after removal.
```
finally {
invalidateResultCache();
leaveBusy();
}```
> Figure out what qryResCache is used for and where it is used
> ------------------------------------------------------------
>
> Key: IGNITE-26758
> URL: https://issues.apache.org/jira/browse/IGNITE-26758
> Project: Ignite
> Issue Type: Improvement
> Reporter: Kirill Anisimov
> Assignee: Kirill Anisimov
> Priority: Major
> Labels: cache, investigation
> Fix For: 2.18
>
>
> There is a qryResCache module in our codebase, but it is not entirely clear
> what exactly it caches and what it is intended for. It is necessary to
> analyze its operation and determine whether it needs to be used.
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