With onHeapCacheEnabled = false, BinaryOnHeapOutputStream is still used, why?

[John Wilson <sa...@gmail.com>]

Hi,

I'm running the CacheAPIExample below with no on-heap caching, locally
using Intellij.

The stack frame shows that the entry I put is written on heap (using
BinaryOnheapOutputStream) and not off-heap (using BinaryOffheapOutputStream).
What's going on?

        try (Ignite ignite =
Ignition.start("examples/config/example-ignite.xml")) {
            System.out.println();
            System.out.println(">>> Cache API example started.");

            CacheConfiguration<Integer, String> cfg = new
CacheConfiguration<>();
            cfg.setOnheapCacheEnabled(false);
            cfg.setCacheMode(CacheMode.PARTITIONED);
            cfg.setName(CACHE_NAME);

            // Auto-close cache at the end of the example.
            try (IgniteCache<Integer, String> cache =
ignite.getOrCreateCache(cfg)) {
                // Demonstrate atomic map operations.
cache.put(999, "777");
            }
            finally {
                // Distributed cache could be removed from cluster only by
#destroyCache() call.
                ignite.destroyCache(CACHE_NAME);
            }
        }

Stack Frame:

 at org.apache.ignite.internal.util.GridUnsafe.putByte(GridUnsafe.java:394)
 *at
org.apache.ignite.internal.binary.streams.BinaryHeapOutputStream.unsafeWriteByte(BinaryHeapOutputStream.java:142)*
 at
org.apache.ignite.internal.binary.BinaryWriterExImpl.writeIntFieldPrimitive(BinaryWriterExImpl.java:999)
 at
org.apache.ignite.internal.binary.BinaryClassDescriptor.write(BinaryClassDescriptor.java:554)
 at
org.apache.ignite.internal.binary.BinaryWriterExImpl.marshal0(BinaryWriterExImpl.java:206)
 at
org.apache.ignite.internal.binary.BinaryWriterExImpl.marshal(BinaryWriterExImpl.java:147)
 at
org.apache.ignite.internal.binary.BinaryWriterExImpl.marshal(BinaryWriterExImpl.java:134)
 at
org.apache.ignite.internal.binary.GridBinaryMarshaller.marshal(GridBinaryMarshaller.java:251)
 at
org.apache.ignite.internal.processors.cache.binary.CacheObjectBinaryProcessorImpl.marshal(CacheObjectBinaryProcessorImpl.java:732)
 at
org.apache.ignite.internal.processors.cache.KeyCacheObjectImpl.valueBytes(KeyCacheObjectImpl.java:78)
 at
org.apache.ignite.internal.processors.cache.GridCacheMapEntry.innerUpdate(GridCacheMapEntry.java:1682)
 - locked <0xfc5> (a
org.apache.ignite.internal.processors.cache.distributed.dht.GridDhtCacheEntry)
 at
org.apache.ignite.internal.processors.cache.distributed.dht.atomic.GridDhtAtomicCache.updateSingle(GridDhtAtomicCache.java:2462)
 at
org.apache.ignite.internal.processors.cache.distributed.dht.atomic.GridDhtAtomicCache.update(GridDhtAtomicCache.java:1944)
 at
org.apache.ignite.internal.processors.cache.distributed.dht.atomic.GridDhtAtomicCache.updateAllAsyncInternal0(GridDhtAtomicCache.java:1797)
 at
org.apache.ignite.internal.processors.cache.distributed.dht.atomic.GridDhtAtomicCache.updateAllAsyncInternal(GridDhtAtomicCache.java:1689)
 at
org.apache.ignite.internal.processors.cache.distributed.dht.atomic.GridNearAtomicAbstractUpdateFuture.sendSingleRequest(GridNearAtomicAbstractUpdateFuture.java:299)
 at
org.apache.ignite.internal.processors.cache.distributed.dht.atomic.GridNearAtomicSingleUpdateFuture.map(GridNearAtomicSingleUpdateFuture.java:480)
 at
org.apache.ignite.internal.processors.cache.distributed.dht.atomic.GridNearAtomicSingleUpdateFuture.mapOnTopology(GridNearAtomicSingleUpdateFuture.java:440)
 at
org.apache.ignite.internal.processors.cache.distributed.dht.atomic.GridNearAtomicAbstractUpdateFuture.map(GridNearAtomicAbstractUpdateFuture.java:248)
 at
org.apache.ignite.internal.processors.cache.distributed.dht.atomic.GridDhtAtomicCache.update0(GridDhtAtomicCache.java:1170)
 at
org.apache.ignite.internal.processors.cache.distributed.dht.atomic.GridDhtAtomicCache.put0(GridDhtAtomicCache.java:659)
 at
org.apache.ignite.internal.processors.cache.GridCacheAdapter.put(GridCacheAdapter.java:2334)
 at
org.apache.ignite.internal.processors.cache.GridCacheAdapter.put(GridCacheAdapter.java:2311)
 at
org.apache.ignite.internal.processors.cache.IgniteCacheProxyImpl.put(IgniteCacheProxyImpl.java:1005)
 at
org.apache.ignite.internal.processors.cache.GatewayProtectedCacheProxy.put(GatewayProtectedCacheProxy.java:872)
 at
org.apache.ignite.examples.datagrid.CacheApiExample.main(CacheApiExample.java:56)

Re: With onHeapCacheEnabled = false, BinaryOnHeapOutputStream is still used, why?

[dkarachentsev <dk...@gridgain.com>]

Hi John,

BinaryHeapOutputStream is the part of binary marshaller, and it's used for
object serialization only. Entry are stored in off-heap paged memory as
expected.

Thanks!
-Dmitry.



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