[GEODE-3844] OffHeap region close could be more efficient in its memory usage.

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: offheap
• Assignee: Unassigned
• Reporter: Anilkumar Gingade
• Created: 16/Oct/17 23:35
• Updated: 16/Oct/17 23:35

Description

Close on OffHeap region tries to copy OffHeap RegionEnties into array, which could take up lot of memory based on the region size.
This could be optimized by working on the region map itself or by working on the entries per hashmap segment one at a time.

java.lang.OutOfMemoryError: Java heap space
at java.util.Arrays.copyOf(Arrays.java:3181)
at java.util.ArrayList.grow(ArrayList.java:261)
at java.util.ArrayList.ensureExplicitCapacity(ArrayList.java:235)
at java.util.ArrayList.ensureCapacityInternal(ArrayList.java:227)
at java.util.ArrayList.add(ArrayList.java:458)
at org.apache.geode.internal.util.concurrent.CustomEntryConcurrentHashMap$Segment.clear(CustomEntryConcurrentHashMap.java:1037)
at org.apache.geode.internal.util.concurrent.CustomEntryConcurrentHashMap.clear(CustomEntryConcurrentHashMap.java:1795)
at org.apache.geode.internal.cache.AbstractRegionMap._mapClear(AbstractRegionMap.java:329)
at org.apache.geode.internal.cache.AbstractRegionMap.clear(AbstractRegionMap.java:371)
at org.apache.geode.internal.cache.AbstractLRURegionMap.clear(AbstractLRURegionMap.java:685)
at org.apache.geode.internal.cache.AbstractRegionMap.close(AbstractRegionMap.java:337)
at org.apache.geode.internal.cache.LocalRegion.closeEntries(LocalRegion.java:2703)
at org.apache.geode.internal.cache.LocalRegion.recursiveDestroyRegion(LocalRegion.java:2664)
at org.apache.geode.internal.cache.LocalRegion.basicDestroyRegion(LocalRegion.java:6184)
at org.apache.geode.internal.cache.DistributedRegion.basicDestroyRegion(DistributedRegion.java:1707)
at org.apache.geode.internal.cache.LocalRegion.close(LocalRegion.java:2206)