>Does your hadoop support append/sync? current version of hadoop supports append/sync ,but we have not trun on explicitely in hdfs-site.xml.
>Yeah, there is a whole industry of tools for looking at running apps. >You could try the profiler in eclipse or one of the commercial tools. I will google that. >So, what is the worry? You are using CMS? It carries lots of >garbage. If you are really concerned, then maybe dump a heap -- this >can take a while to write if your heap is large and you will freeze >the daemon while the heap is being written (be sure you write the heap >to a place that has space) -- and use one of the aforementioned tools >to inspect it. it's kinda delicate to dump heap now, and i tried once and regionserver process crashed . dumping heap process ended simultaneously.
