Thanks a lot for the help. -Nirmal From: Arun C Murthy [mailto:[email protected]] Sent: Friday, January 17, 2014 9:09 PM To: [email protected] Subject: Re: Doubts: Deployment and Configuration of YARN cluster
On Jan 16, 2014, at 9:14 PM, Nirmal Kumar <[email protected]<mailto:[email protected]>> wrote: Hi Arun, Thanks a lot for the clarification. I understand it like in *yarn-site.xml* first I can set the max. and min. container size GLOBALLY for all the nodes in the cluster through: * {yarn.scheduler.minimum-allocation-mb} * {yarn.scheduler.maximum-allocation-mb} Then at each of the node I can set the NM memory using: * {yarn.nodemanager.resource.memory-mb} Exactly! :) My 2nd doubt is whether we can run Mappers\Reducers tasks with varying memory options at each of the slave nodes. That is, can we change the following properties in *mapred-site.xml* at each of the slave nodes? This is because depending on the machine's power we can adjust the memory options for the M\R tasks. * {mapreduce.map.memory.mb} * {mapreduce.map.java.opts} * {mapreduce.reduce.memory.mb} * {mapreduce.reduce.java.opts} You can change these for every single job, so each job can have different requirements. $ bin/hadoop jar hadoop-examples.jar word count -Dmapreduce.map.memory.mb=1024 ... $ bin/hadoop jar hadoop-examples.jar word count -Dmapreduce.map.memory.mb=2048 ... hth, Arun Thanks, -Nirmal From: Arun C Murthy [mailto:[email protected]<http://hortonworks.com>] Sent: Thursday, January 16, 2014 7:43 PM To: [email protected]<mailto:[email protected]> Subject: Re: Doubts: Deployment and Configuration of YARN cluster No, you can set resources available in each node to be different... For e.g. Node A: 10G, Node B: 12G. Now, if min. container size is 1G, the RM will allocate 10 containers to Node A and 12 containers to Node B. hth, Arun On Jan 15, 2014, at 11:03 PM, Nirmal Kumar <[email protected]<mailto:[email protected]>> wrote: Hi German, I went through the links for memory configuration settings/best-practices. It considers the cluster to be homogenous i.e. same RAM size in all the nodes. Also on the Yarn whitepaper(Section 3.2 Page 6) I see: This resource model serves current applications well in homogeneous environments, but we expect it to evolve over time as the ecosystem matures and new requirements emerge. Does that mean in YARN in order to configure processing capacity like Container Size, No. of Containers, No. of Mappers\Reducers the cluster has to be homogenous? How about if I have a *heterogeneous cluster* with varying RAM, disks , cores? Thanks, -Nirmal From: Nirmal Kumar Sent: Wednesday, January 15, 2014 8:22 PM To: [email protected]<mailto:[email protected]> Subject: RE: Doubts: Deployment and Configuration of YARN cluster Thanks a lot German. Will go through the links and see if that answers my questions\doubts. -Nirmal From: German Florez-Larrahondo [mailto:[email protected]] Sent: Wednesday, January 15, 2014 7:20 PM To: [email protected]<mailto:[email protected]> Subject: RE: Doubts: Deployment and Configuration of YARN cluster Nirmal -A good summary regarding memory configuration settings/best-practices can be found here. Note that in YARN, the way you configure resource limits dictates number of containers in the nodes and in the cluster: http://dev.hortonworks.com.s3.amazonaws.com/HDPDocuments/HDP2/HDP-2.0.6.0/bk_installing_manually_book/content/rpm-chap1-11.html -A good intro to YARN configuration is this: http://www.thecloudavenue.com/2012/01/getting-started-with-nextgen-mapreduce_11.html Regards .g From: Nirmal Kumar [mailto:[email protected]] Sent: Wednesday, January 15, 2014 7:22 AM To: [email protected]<mailto:[email protected]> Subject: Doubts: Deployment and Configuration of YARN cluster All, I am new to YARN and have certain doubts regarding the deployment and configuration of YARN on a cluster. As per my understanding to deploy Hadoop 2.x using YARN on a cluster we need to distribute the below files to all the slave nodes in the cluster: * conf/core-site.xml * conf/hdfs-site.xml * conf/yarn-site.xml * conf/mapred-site.xml Also we need to ONLY change the following file on each slave nodes: * conf/hdfs-site.xml Need to mention the {dfs.datanode.name.dir} value Do we need to change any other config file on the slave nodes? Can I change {yarn.nodemanager.resource.memory-mb} for each NM running on the slave nodes? This is since I might have a *heterogeneous environment* i.e. different nodes with different memory and cores. For NM1 I might have 40GB memory and for the other say 20GB. Also, {mapreduce.map.memory.mb} specifies the *max. virtual memory* allowed by a Hadoop task subprocess. {mapreduce.map.java.opts} specify the *max. heap space* of the allocated jvm. If you exceed the max heap size, the JVM throws an OOM. {mapreduce.reduce.memory.mb} {mapreduce.reduce.java.opts} are the above properties applicable to all the Map\Reduce tasks(from different Map Reduce applications) in general, running on different slave nodes? or Can I change these for a particular slave node.? For e.g. say for a SlaveNode1 I run the map task with 4GB and for other SlaveNode2 I run the map task with 8GB. Same with the reduce task. I need some understanding to *configure processing capacity* in the cluster like Container Size, No. of Containers, No. of Mappers\Reducers. Thanks, -Nirmal ________________________________ NOTE: This message may contain information that is confidential, proprietary, privileged or otherwise protected by law. The message is intended solely for the named addressee. If received in error, please destroy and notify the sender. Any use of this email is prohibited when received in error. Impetus does not represent, warrant and/or guarantee, that the integrity of this communication has been maintained nor that the communication is free of errors, virus, interception or interference. ________________________________ NOTE: This message may contain information that is confidential, proprietary, privileged or otherwise protected by law. The message is intended solely for the named addressee. If received in error, please destroy and notify the sender. Any use of this email is prohibited when received in error. Impetus does not represent, warrant and/or guarantee, that the integrity of this communication has been maintained nor that the communication is free of errors, virus, interception or interference. ________________________________ NOTE: This message may contain information that is confidential, proprietary, privileged or otherwise protected by law. The message is intended solely for the named addressee. If received in error, please destroy and notify the sender. Any use of this email is prohibited when received in error. Impetus does not represent, warrant and/or guarantee, that the integrity of this communication has been maintained nor that the communication is free of errors, virus, interception or interference. -- Arun C. Murthy Hortonworks Inc. http://hortonworks.com/ CONFIDENTIALITY NOTICE NOTICE: This message is intended for the use of the individual or entity to which it is addressed and may contain information that is confidential, privileged and exempt from disclosure under applicable law. If the reader of this message is not the intended recipient, you are hereby notified that any printing, copying, dissemination, distribution, disclosure or forwarding of this communication is strictly prohibited. If you have received this communication in error, please contact the sender immediately and delete it from your system. Thank You. ________________________________ NOTE: This message may contain information that is confidential, proprietary, privileged or otherwise protected by law. The message is intended solely for the named addressee. If received in error, please destroy and notify the sender. Any use of this email is prohibited when received in error. Impetus does not represent, warrant and/or guarantee, that the integrity of this communication has been maintained nor that the communication is free of errors, virus, interception or interference. -- Arun C. Murthy Hortonworks Inc. http://hortonworks.com/ CONFIDENTIALITY NOTICE NOTICE: This message is intended for the use of the individual or entity to which it is addressed and may contain information that is confidential, privileged and exempt from disclosure under applicable law. If the reader of this message is not the intended recipient, you are hereby notified that any printing, copying, dissemination, distribution, disclosure or forwarding of this communication is strictly prohibited. If you have received this communication in error, please contact the sender immediately and delete it from your system. Thank You. ________________________________ NOTE: This message may contain information that is confidential, proprietary, privileged or otherwise protected by law. The message is intended solely for the named addressee. If received in error, please destroy and notify the sender. Any use of this email is prohibited when received in error. Impetus does not represent, warrant and/or guarantee, that the integrity of this communication has been maintained nor that the communication is free of errors, virus, interception or interference.
