On Wed, Nov 21, 2012 at 12:16 AM, Yusup Ashrap <[email protected]> wrote: >>Does your hadoop support append/sync? > current version of hadoop supports append/sync ,but we have not trun on > explicitely in hdfs-site.xml. >
Then you will lose data. >>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. Yes. I suppose. If it takes a long time to dump it could hose the regionserver. Did it make a dump file that you could use? St.Ack
