Adobe Experience Manager Crashes during large asset uploads

Statement: 

Adobe Experience Manager 6.x either crashes or is slow during a large asset upload. Heap dump analysis shows that the CQBufferedImageCache is consuming a quarter or more of the heap.

Solution:

Why issue occurs:

• The default maximum cache size for CQBufferedImageCache is set to a quarter of the JVM heap size.  
• To illustrate the problem, let's say you have a system with a max heap (-Xmx param) of 5 GB, an Oak BlobCache set at 1 GB, and Document cache set at 2 GB.
•  In this case, the buffered cache would take max 1.25 GB and that would leave only 0.75-GB memory for unexpected spikes.
• Eventually, the JVM fails with OutOfMemoryErrors. To solve the problem, reduce the configured max size of the buffered image cache.
• When uploading large amounts of assets to Adobe Experience Manager, tune the buffered cache size by configuring it via the OSGi Web Console.

Solution:

1. Go to http://host:port/system/console/configMgr/com.day.cq.dam.core.impl.cache.CQBufferedImageCache
2. Set the property cq.dam.image.cache.max.memory in bytes for example, 1073741824 is 1 GB (1024*1024*1024 = 1 GB).