HADOOP_NAMENODE_OPTS="-Xmx500m" will set it to 500MB. The "OPTS" here refers to JVM options. -Xmx is a common JVM option to set the maximum heap.
-- Philip On Wed, Dec 1, 2010 at 4:27 AM, Dave Shine <dave.sh...@channelintelligence.com> wrote: > I'm using 0.20.2. > > I've seen references to HADOOP_NAMENODE_OPTS, but nothing that clearly > explains how to set them. > > Any help would be greatly appreciated. > > Dave Shine > > -----Original Message----- > From: Hemanth Yamijala [mailto:yhema...@gmail.com] > Sent: Tuesday, November 30, 2010 9:39 PM > To: common-dev@hadoop.apache.org > Subject: Re: Configuring Heap Size for Name Node > > Hi, > > On Wed, Dec 1, 2010 at 1:38 AM, Dave Shine > <dave.sh...@channelintelligence.com> wrote: >> How do I change the heap size for the Name Node (and Secondary Name Node) >> without changing the heap size for the data nodes, job tracker, and task >> trackers? > > Which version are you using. I am pretty certain that 0.21 and above > have HADOOP_NAMENODE_OPTS which can be used to set the heap size only > for NameNode. You can check if this option is defined in > hadoop-env.sh. > > Thanks > Hemanth >> >> Thanks, >> Dave Shine >> Sr. Software Engineer >> >> 1180 Celebration Blvd Suite 101 >> Celebration FL 34747 >> Office 321-939-5093 >> Mobile 407-314-0122 >> Fax 321-939-5604 >> dave.sh...@channelintellence.com<mailto:dave.sh...@channelintellence.com> >> http://www.channelintelligence.com<http://www.channelintelligence.com/> >> >> >> >> ________________________________ >> The information contained in this email message is considered confidential >> and proprietary to the sender and is intended solely for review and use by >> the named recipient. Any unauthorized review, use or distribution is >> strictly prohibited. If you have received this message in error, please >> advise the sender by reply email and delete the message. >> >
