[jira] [Created] (IGNITE-9315) Eviction meta from near cache may appear in DHT entries

[Anton Vinogradov (Jira)]

Stanislav Lukyanov created IGNITE-9315:
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             Summary: Eviction meta from near cache may appear in DHT entries
                 Key: IGNITE-9315
                 URL: https://issues.apache.org/jira/browse/IGNITE-9315
             Project: Ignite
          Issue Type: Bug
            Reporter: Stanislav Lukyanov
            Assignee: Stanislav Lukyanov


There are cases when eviction metadata from near cache's eviction policy may be added to a DHT cache entry, leading to unpredictable behavior.

The bug is caused by coding mistakes when a DHT entry is being updated, but near cache entry is being touched.
E.g. in GridDhtPartitionDemander::preloadEntry:
{code}
GridCacheContext cctx = grp.sharedGroup() ? ctx.cacheContext(entry.cacheId()) : grp.singleCacheContext();

cached = cctx.dhtCache().entryEx(entry.key());
//                cctx = cached.context();

if (log.isDebugEnabled())
    log.debug("Rebalancing key [key=" + entry.key() + ", part=" + p + ", node=" + from.id() + ']');

if (preloadPred == null || preloadPred.apply(entry)) {
    if (cached.initialValue(
        entry.value(),
        entry.version(),
        entry.ttl(),
        entry.expireTime(),
        true,
        topVer,
        cctx.isDrEnabled() ? DR_PRELOAD : DR_NONE,
        false
    )) {
        cctx.evicts().touch(cached, topVer); // Start tracking.
{code}

Here `cached` is always DHT entry, but `cctx` can be near.



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