Hi, The recommended RAM for namenode,datanode, jobtracker and tasktracker is 1 GB. The datanode would be using the major part of memory to do following- a. Continuously (at regular interval) send heartbeat messages to namenode to say 'I am live and awake' b. In case, any data/file is added to DFS, OR Map Reduce jobs are running, datanode would again be talking to namenode or transferring data from its local copy to either client or other slave datanodes in the cluster
-Sanjay Stas Oskin-2 wrote: > > Hi. > > I measured the Datanode memory usage, and noticed they take up to 700 MB > of > RAM. > > As their main job is to store files to disk, any idea why they take so > much > RAM? > > Thanks for any information. > > -- View this message in context: http://www.nabble.com/Datanode-high-memory-usage-tp25221400p25243059.html Sent from the Hadoop core-user mailing list archive at Nabble.com.
