heap-size

问题 I would like to know the relation between the mapreduce.map.memory.mb and mapred.map.child.java.opts parameters. Is mapreduce.map.memory.mb > mapred.map.child.java.opts ? Thanks, Kewal. 回答1: mapreduce.map.memory.mb is the upper memory limit that Hadoop allows to be allocated to a mapper, in megabytes. The default is 512. If this limit is exceeded, Hadoop will kill the mapper with an error like this: Container[pid=container_1406552545451_0009_01_000002,containerID=container_234132_0001_01

问题 Many posts have talked about Android heap size, and so far what I've found out is that the only common thing about max heap size is that it's at least 16MB, but that was the limit ever since API 3. For using more memory, people would suggest to use the NDK or anything that is beyond the "normal" Android development. Is there any Android version that has a requirement from the devices to have a larger heap size, so that I could start assuming a larger one and stop being so cheap on memory? Is