Without setting Xmx to a sane value for EC2 (between 250-500M depending on the server). A Flume collector in autoCollector mode with 8 logical streams consumes all available server ram until it is gone. I have not been able to see any GC activity on the node/collector which leaves me to believe that flume is leaving objects in an unreapable state. I restarted one flume instance yesterday and within 12 hours I have seen it take 75M of ram for 6534 counts of the int object.
We have it configured with 8 logical collectors per a collector/node separated via flows with all source nodes in autoE2E mode. 4 flows write to HDFS, 4 flows write to S3.
I have been experiencing this every 2-3 days on the 32 bit machine (1.7 GB RAM) and every 10 or so days on the 64 bit machine (7 GB RAM).
I have forced Xmx on both machines, but without the GC process working, I have a feeling the will OOM and crash (maybe the watchdog will be able to restart them, but it is unknown at this time).