Re: Could not reserve enough space for heap in JVM
Thanx guys - I've a clearer picture now:-) Cheers Arijit 2009/2/26 souravm > In 32 bit machine u r limited to 4 gb heap size at jvm level per machine > > - Original Message - > From: Arijit Mukherjee > To: core-user@hadoop.apache.org > Sent: Wed Feb 25 21:27:25 2009 > Subject: Re: Could not reserve enough space for heap in JVM > > Mine is 32bit. As of now, it has only 2GB RAM, but I'm planning to acquire > more hardware resources - so a clarification in this regard would help me > in > deciding the specs of the new cluster. > > Arijit > > 2009/2/26 souravm > > > Is ur machine 32 bit or 64 bit > > > > - Original Message - > > From: Nick Cen > > To: core-user@hadoop.apache.org > > Sent: Wed Feb 25 21:10:00 2009 > > Subject: Re: Could not reserve enough space for heap in JVM > > > > I got a question relatived to the HADOOP_HEAPSIZE variable. My machine's > > memory size is 16G. but when i set HADOOP_HEAPSIZE to 4GB, it thrown the > > exception refered in this thread. how can i make full use of my mem. thx. > > > > 2009/2/26 Arijit Mukherjee > > > > > I was getting similar errors too while running the mapreduce samples. I > > > fiddled with the hadoop-env.sh (where the HEAPSIZE is specified) and > the > > > hadoop-site.xml files - and rectified it after some trial and error. > But > > I > > > would like to know if there is a thumb rule for this. Right now, I've a > > > core > > > duo machine with 2GB RAM running on Ubuntu 8.10, and I've found that a > > > HEAPSIZE of 256Mb works without any problems. Anything more than that > > would > > > give the same error (even when nothing else is going on in the > machine). > > > > > > Arijit > > > > > > 2009/2/26 Anum Ali > > > > > > > If the solution given my Matei Zaharia wont work , which I guess it > > > > wont if you are using eclipse 3.3.0 because this is a bug , which > they > > > > resloved it in later version which is eclipse 3.4 ganymede. Better > > > > upgrade eclipse version. > > > > > > > > > > > > > > > > > > > > On 2/26/09, Matei Zaharia wrote: > > > > > These variables have to be at runtime through a config file, not at > > > > compile > > > > > time. You can set them in hadoop-env.sh: Uncomment the line with > > export > > > > > HADOOP_HEAPSIZE= to set the heap size for all Hadoop > > > processes, > > > > or > > > > > change options for specific commands. Now these commands are for > the > > > > Hadoop > > > > > processes themselves, but if you are getting the error in tasks > > you're > > > > > running, you can set these in your hadoop-site.xml through the > > > > > mapred.child.java.opts variable, as follows: > > > > > > > > > > mapred.child.java.opts > > > > > -Xmx512m > > > > > > > > > > > > > > > By the way I'm not sure if -J-Xmx is the right syntax; I've always > > seen > > > > -Xmx > > > > > and -Xms. > > > > > > > > > > On Wed, Feb 25, 2009 at 5:05 PM, madhuri72 > > wrote: > > > > > > > > > >> > > > > >> Hi, > > > > >> > > > > >> I'm trying to run hadoop version 19 on ubuntu with java build > > > > >> 1.6.0_11-b03. > > > > >> I'm getting the following error: > > > > >> > > > > >> Error occurred during initialization of VM > > > > >> Could not reserve enough space for object heap > > > > >> Could not create the Java virtual machine. > > > > >> make: *** [run] Error 1 > > > > >> > > > > >> I searched the forums and found some advice on setting the VM's > > memory > > > > via > > > > >> the javac options > > > > >> > > > > >> -J-Xmx512m or -J-Xms256m > > > > >> > > > > >> I have tried this with various sizes between 128 and 1024 MB. I > am > > > > adding > > > > >> this tag when I compile the source. This isn't working for me, > and > > > > >> allocating 1 GB of memory is a lot for the machine I'm using. Is > > > there > > > >
Re: Could not reserve enough space for heap in JVM
In 32 bit machine u r limited to 4 gb heap size at jvm level per machine - Original Message - From: Arijit Mukherjee To: core-user@hadoop.apache.org Sent: Wed Feb 25 21:27:25 2009 Subject: Re: Could not reserve enough space for heap in JVM Mine is 32bit. As of now, it has only 2GB RAM, but I'm planning to acquire more hardware resources - so a clarification in this regard would help me in deciding the specs of the new cluster. Arijit 2009/2/26 souravm > Is ur machine 32 bit or 64 bit > > - Original Message - > From: Nick Cen > To: core-user@hadoop.apache.org > Sent: Wed Feb 25 21:10:00 2009 > Subject: Re: Could not reserve enough space for heap in JVM > > I got a question relatived to the HADOOP_HEAPSIZE variable. My machine's > memory size is 16G. but when i set HADOOP_HEAPSIZE to 4GB, it thrown the > exception refered in this thread. how can i make full use of my mem. thx. > > 2009/2/26 Arijit Mukherjee > > > I was getting similar errors too while running the mapreduce samples. I > > fiddled with the hadoop-env.sh (where the HEAPSIZE is specified) and the > > hadoop-site.xml files - and rectified it after some trial and error. But > I > > would like to know if there is a thumb rule for this. Right now, I've a > > core > > duo machine with 2GB RAM running on Ubuntu 8.10, and I've found that a > > HEAPSIZE of 256Mb works without any problems. Anything more than that > would > > give the same error (even when nothing else is going on in the machine). > > > > Arijit > > > > 2009/2/26 Anum Ali > > > > > If the solution given my Matei Zaharia wont work , which I guess it > > > wont if you are using eclipse 3.3.0 because this is a bug , which they > > > resloved it in later version which is eclipse 3.4 ganymede. Better > > > upgrade eclipse version. > > > > > > > > > > > > > > > On 2/26/09, Matei Zaharia wrote: > > > > These variables have to be at runtime through a config file, not at > > > compile > > > > time. You can set them in hadoop-env.sh: Uncomment the line with > export > > > > HADOOP_HEAPSIZE= to set the heap size for all Hadoop > > processes, > > > or > > > > change options for specific commands. Now these commands are for the > > > Hadoop > > > > processes themselves, but if you are getting the error in tasks > you're > > > > running, you can set these in your hadoop-site.xml through the > > > > mapred.child.java.opts variable, as follows: > > > > > > > > mapred.child.java.opts > > > > -Xmx512m > > > > > > > > > > > > By the way I'm not sure if -J-Xmx is the right syntax; I've always > seen > > > -Xmx > > > > and -Xms. > > > > > > > > On Wed, Feb 25, 2009 at 5:05 PM, madhuri72 > wrote: > > > > > > > >> > > > >> Hi, > > > >> > > > >> I'm trying to run hadoop version 19 on ubuntu with java build > > > >> 1.6.0_11-b03. > > > >> I'm getting the following error: > > > >> > > > >> Error occurred during initialization of VM > > > >> Could not reserve enough space for object heap > > > >> Could not create the Java virtual machine. > > > >> make: *** [run] Error 1 > > > >> > > > >> I searched the forums and found some advice on setting the VM's > memory > > > via > > > >> the javac options > > > >> > > > >> -J-Xmx512m or -J-Xms256m > > > >> > > > >> I have tried this with various sizes between 128 and 1024 MB. I am > > > adding > > > >> this tag when I compile the source. This isn't working for me, and > > > >> allocating 1 GB of memory is a lot for the machine I'm using. Is > > there > > > >> some > > > >> way to make this work with hadoop? Is there somewhere else I can > set > > > the > > > >> heap memory? > > > >> > > > >> Thanks. > > > >> > > > >> > > > >> > > > >> > > > >> > > > >> -- > > > >> View this message in context: > > > >> > > > > > > http://www.nabble.com/Could-not-reserve-enough-space-for-heap-in-JVM-tp22215608p22215608.html > > > >> Sent from the Hadoop core-user mailing list ar
Re: Could not reserve enough space for heap in JVM
Yes, the namenode, jobtracker, datanode, etc are separate processes. Typically in a large cluster you'd have one machine running a namenode, one running a jobtracker, and many slave machines running a datanode and tasktracker. The datanodes and tasktrackers don't need high amounts of memory. The namenode needs more if you have a large filesystem (large numbers of files), and the jobtracker needs more if you have many large jobs (tens of thousands of tasks). However these should not be problems on smaller clusters. The child memory settings are the ones to fix if your tasks are failing. On Wed, Feb 25, 2009 at 9:27 PM, Arijit Mukherjee wrote: > Mine is 32bit. As of now, it has only 2GB RAM, but I'm planning to acquire > more hardware resources - so a clarification in this regard would help me > in > deciding the specs of the new cluster. > > Arijit > > 2009/2/26 souravm > > > Is ur machine 32 bit or 64 bit > > > > - Original Message - > > From: Nick Cen > > To: core-user@hadoop.apache.org > > Sent: Wed Feb 25 21:10:00 2009 > > Subject: Re: Could not reserve enough space for heap in JVM > > > > I got a question relatived to the HADOOP_HEAPSIZE variable. My machine's > > memory size is 16G. but when i set HADOOP_HEAPSIZE to 4GB, it thrown the > > exception refered in this thread. how can i make full use of my mem. thx. > > > > 2009/2/26 Arijit Mukherjee > > > > > I was getting similar errors too while running the mapreduce samples. I > > > fiddled with the hadoop-env.sh (where the HEAPSIZE is specified) and > the > > > hadoop-site.xml files - and rectified it after some trial and error. > But > > I > > > would like to know if there is a thumb rule for this. Right now, I've a > > > core > > > duo machine with 2GB RAM running on Ubuntu 8.10, and I've found that a > > > HEAPSIZE of 256Mb works without any problems. Anything more than that > > would > > > give the same error (even when nothing else is going on in the > machine). > > > > > > Arijit > > > > > > 2009/2/26 Anum Ali > > > > > > > If the solution given my Matei Zaharia wont work , which I guess it > > > > wont if you are using eclipse 3.3.0 because this is a bug , which > they > > > > resloved it in later version which is eclipse 3.4 ganymede. Better > > > > upgrade eclipse version. > > > > > > > > > > > > > > > > > > > > On 2/26/09, Matei Zaharia wrote: > > > > > These variables have to be at runtime through a config file, not at > > > > compile > > > > > time. You can set them in hadoop-env.sh: Uncomment the line with > > export > > > > > HADOOP_HEAPSIZE= to set the heap size for all Hadoop > > > processes, > > > > or > > > > > change options for specific commands. Now these commands are for > the > > > > Hadoop > > > > > processes themselves, but if you are getting the error in tasks > > you're > > > > > running, you can set these in your hadoop-site.xml through the > > > > > mapred.child.java.opts variable, as follows: > > > > > > > > > > mapred.child.java.opts > > > > > -Xmx512m > > > > > > > > > > > > > > > By the way I'm not sure if -J-Xmx is the right syntax; I've always > > seen > > > > -Xmx > > > > > and -Xms. > > > > > > > > > > On Wed, Feb 25, 2009 at 5:05 PM, madhuri72 > > wrote: > > > > > > > > > >> > > > > >> Hi, > > > > >> > > > > >> I'm trying to run hadoop version 19 on ubuntu with java build > > > > >> 1.6.0_11-b03. > > > > >> I'm getting the following error: > > > > >> > > > > >> Error occurred during initialization of VM > > > > >> Could not reserve enough space for object heap > > > > >> Could not create the Java virtual machine. > > > > >> make: *** [run] Error 1 > > > > >> > > > > >> I searched the forums and found some advice on setting the VM's > > memory > > > > via > > > > >> the javac options > > > > >> > > > > >> -J-Xmx512m or -J-Xms256m > > > > >> > > > > >> I have tried this with various sizes between 128 and 1024 MB
Re: Could not reserve enough space for heap in JVM
Mine is 32bit. As of now, it has only 2GB RAM, but I'm planning to acquire more hardware resources - so a clarification in this regard would help me in deciding the specs of the new cluster. Arijit 2009/2/26 souravm > Is ur machine 32 bit or 64 bit > > - Original Message - > From: Nick Cen > To: core-user@hadoop.apache.org > Sent: Wed Feb 25 21:10:00 2009 > Subject: Re: Could not reserve enough space for heap in JVM > > I got a question relatived to the HADOOP_HEAPSIZE variable. My machine's > memory size is 16G. but when i set HADOOP_HEAPSIZE to 4GB, it thrown the > exception refered in this thread. how can i make full use of my mem. thx. > > 2009/2/26 Arijit Mukherjee > > > I was getting similar errors too while running the mapreduce samples. I > > fiddled with the hadoop-env.sh (where the HEAPSIZE is specified) and the > > hadoop-site.xml files - and rectified it after some trial and error. But > I > > would like to know if there is a thumb rule for this. Right now, I've a > > core > > duo machine with 2GB RAM running on Ubuntu 8.10, and I've found that a > > HEAPSIZE of 256Mb works without any problems. Anything more than that > would > > give the same error (even when nothing else is going on in the machine). > > > > Arijit > > > > 2009/2/26 Anum Ali > > > > > If the solution given my Matei Zaharia wont work , which I guess it > > > wont if you are using eclipse 3.3.0 because this is a bug , which they > > > resloved it in later version which is eclipse 3.4 ganymede. Better > > > upgrade eclipse version. > > > > > > > > > > > > > > > On 2/26/09, Matei Zaharia wrote: > > > > These variables have to be at runtime through a config file, not at > > > compile > > > > time. You can set them in hadoop-env.sh: Uncomment the line with > export > > > > HADOOP_HEAPSIZE= to set the heap size for all Hadoop > > processes, > > > or > > > > change options for specific commands. Now these commands are for the > > > Hadoop > > > > processes themselves, but if you are getting the error in tasks > you're > > > > running, you can set these in your hadoop-site.xml through the > > > > mapred.child.java.opts variable, as follows: > > > > > > > > mapred.child.java.opts > > > > -Xmx512m > > > > > > > > > > > > By the way I'm not sure if -J-Xmx is the right syntax; I've always > seen > > > -Xmx > > > > and -Xms. > > > > > > > > On Wed, Feb 25, 2009 at 5:05 PM, madhuri72 > wrote: > > > > > > > >> > > > >> Hi, > > > >> > > > >> I'm trying to run hadoop version 19 on ubuntu with java build > > > >> 1.6.0_11-b03. > > > >> I'm getting the following error: > > > >> > > > >> Error occurred during initialization of VM > > > >> Could not reserve enough space for object heap > > > >> Could not create the Java virtual machine. > > > >> make: *** [run] Error 1 > > > >> > > > >> I searched the forums and found some advice on setting the VM's > memory > > > via > > > >> the javac options > > > >> > > > >> -J-Xmx512m or -J-Xms256m > > > >> > > > >> I have tried this with various sizes between 128 and 1024 MB. I am > > > adding > > > >> this tag when I compile the source. This isn't working for me, and > > > >> allocating 1 GB of memory is a lot for the machine I'm using. Is > > there > > > >> some > > > >> way to make this work with hadoop? Is there somewhere else I can > set > > > the > > > >> heap memory? > > > >> > > > >> Thanks. > > > >> > > > >> > > > >> > > > >> > > > >> > > > >> -- > > > >> View this message in context: > > > >> > > > > > > http://www.nabble.com/Could-not-reserve-enough-space-for-heap-in-JVM-tp22215608p22215608.html > > > >> Sent from the Hadoop core-user mailing list archive at Nabble.com. > > > >> > > > >> > > > > > > > > > > > > > > > -- > > "And when the night is cloudy, > > There is still a light that shines on me, > >
Re: Could not reserve enough space for heap in JVM
I'm making a guesswork here. Are the namenode, datanode, jobtracker and testtracker separate java processes? Does each of them take up separate heap spaces? (Running Jps would show them separately - I guess they may be separate java processes with separate heap spaces). If that's true, then, if the total memory is X, and you are allocating Y as the heapspace, then 4*Y must be much less than X. I'm not sure - this is what I'm speculating. Can anyone confirm this please? Cheers Arijit 2009/2/26 Nick Cen > I got a question relatived to the HADOOP_HEAPSIZE variable. My machine's > memory size is 16G. but when i set HADOOP_HEAPSIZE to 4GB, it thrown the > exception refered in this thread. how can i make full use of my mem. thx. > > 2009/2/26 Arijit Mukherjee > > > I was getting similar errors too while running the mapreduce samples. I > > fiddled with the hadoop-env.sh (where the HEAPSIZE is specified) and the > > hadoop-site.xml files - and rectified it after some trial and error. But > I > > would like to know if there is a thumb rule for this. Right now, I've a > > core > > duo machine with 2GB RAM running on Ubuntu 8.10, and I've found that a > > HEAPSIZE of 256Mb works without any problems. Anything more than that > would > > give the same error (even when nothing else is going on in the machine). > > > > Arijit > > > > 2009/2/26 Anum Ali > > > > > If the solution given my Matei Zaharia wont work , which I guess it > > > wont if you are using eclipse 3.3.0 because this is a bug , which they > > > resloved it in later version which is eclipse 3.4 ganymede. Better > > > upgrade eclipse version. > > > > > > > > > > > > > > > On 2/26/09, Matei Zaharia wrote: > > > > These variables have to be at runtime through a config file, not at > > > compile > > > > time. You can set them in hadoop-env.sh: Uncomment the line with > export > > > > HADOOP_HEAPSIZE= to set the heap size for all Hadoop > > processes, > > > or > > > > change options for specific commands. Now these commands are for the > > > Hadoop > > > > processes themselves, but if you are getting the error in tasks > you're > > > > running, you can set these in your hadoop-site.xml through the > > > > mapred.child.java.opts variable, as follows: > > > > > > > > mapred.child.java.opts > > > > -Xmx512m > > > > > > > > > > > > By the way I'm not sure if -J-Xmx is the right syntax; I've always > seen > > > -Xmx > > > > and -Xms. > > > > > > > > On Wed, Feb 25, 2009 at 5:05 PM, madhuri72 > wrote: > > > > > > > >> > > > >> Hi, > > > >> > > > >> I'm trying to run hadoop version 19 on ubuntu with java build > > > >> 1.6.0_11-b03. > > > >> I'm getting the following error: > > > >> > > > >> Error occurred during initialization of VM > > > >> Could not reserve enough space for object heap > > > >> Could not create the Java virtual machine. > > > >> make: *** [run] Error 1 > > > >> > > > >> I searched the forums and found some advice on setting the VM's > memory > > > via > > > >> the javac options > > > >> > > > >> -J-Xmx512m or -J-Xms256m > > > >> > > > >> I have tried this with various sizes between 128 and 1024 MB. I am > > > adding > > > >> this tag when I compile the source. This isn't working for me, and > > > >> allocating 1 GB of memory is a lot for the machine I'm using. Is > > there > > > >> some > > > >> way to make this work with hadoop? Is there somewhere else I can > set > > > the > > > >> heap memory? > > > >> > > > >> Thanks. > > > >> > > > >> > > > >> > > > >> > > > >> > > > >> -- > > > >> View this message in context: > > > >> > > > > > > http://www.nabble.com/Could-not-reserve-enough-space-for-heap-in-JVM-tp22215608p22215608.html > > > >> Sent from the Hadoop core-user mailing list archive at Nabble.com. > > > >> > > > >> > > > > > > > > > > > > > > > -- > > "And when the night is cloudy, > > There is still a light that shines on me, > > Shine on until tomorrow, let it be." > > > > > > -- > http://daily.appspot.com/food/ > -- "And when the night is cloudy, There is still a light that shines on me, Shine on until tomorrow, let it be."
Re: Could not reserve enough space for heap in JVM
Is ur machine 32 bit or 64 bit - Original Message - From: Nick Cen To: core-user@hadoop.apache.org Sent: Wed Feb 25 21:10:00 2009 Subject: Re: Could not reserve enough space for heap in JVM I got a question relatived to the HADOOP_HEAPSIZE variable. My machine's memory size is 16G. but when i set HADOOP_HEAPSIZE to 4GB, it thrown the exception refered in this thread. how can i make full use of my mem. thx. 2009/2/26 Arijit Mukherjee > I was getting similar errors too while running the mapreduce samples. I > fiddled with the hadoop-env.sh (where the HEAPSIZE is specified) and the > hadoop-site.xml files - and rectified it after some trial and error. But I > would like to know if there is a thumb rule for this. Right now, I've a > core > duo machine with 2GB RAM running on Ubuntu 8.10, and I've found that a > HEAPSIZE of 256Mb works without any problems. Anything more than that would > give the same error (even when nothing else is going on in the machine). > > Arijit > > 2009/2/26 Anum Ali > > > If the solution given my Matei Zaharia wont work , which I guess it > > wont if you are using eclipse 3.3.0 because this is a bug , which they > > resloved it in later version which is eclipse 3.4 ganymede. Better > > upgrade eclipse version. > > > > > > > > > > On 2/26/09, Matei Zaharia wrote: > > > These variables have to be at runtime through a config file, not at > > compile > > > time. You can set them in hadoop-env.sh: Uncomment the line with export > > > HADOOP_HEAPSIZE= to set the heap size for all Hadoop > processes, > > or > > > change options for specific commands. Now these commands are for the > > Hadoop > > > processes themselves, but if you are getting the error in tasks you're > > > running, you can set these in your hadoop-site.xml through the > > > mapred.child.java.opts variable, as follows: > > > > > > mapred.child.java.opts > > > -Xmx512m > > > > > > > > > By the way I'm not sure if -J-Xmx is the right syntax; I've always seen > > -Xmx > > > and -Xms. > > > > > > On Wed, Feb 25, 2009 at 5:05 PM, madhuri72 wrote: > > > > > >> > > >> Hi, > > >> > > >> I'm trying to run hadoop version 19 on ubuntu with java build > > >> 1.6.0_11-b03. > > >> I'm getting the following error: > > >> > > >> Error occurred during initialization of VM > > >> Could not reserve enough space for object heap > > >> Could not create the Java virtual machine. > > >> make: *** [run] Error 1 > > >> > > >> I searched the forums and found some advice on setting the VM's memory > > via > > >> the javac options > > >> > > >> -J-Xmx512m or -J-Xms256m > > >> > > >> I have tried this with various sizes between 128 and 1024 MB. I am > > adding > > >> this tag when I compile the source. This isn't working for me, and > > >> allocating 1 GB of memory is a lot for the machine I'm using. Is > there > > >> some > > >> way to make this work with hadoop? Is there somewhere else I can set > > the > > >> heap memory? > > >> > > >> Thanks. > > >> > > >> > > >> > > >> > > >> > > >> -- > > >> View this message in context: > > >> > > > http://www.nabble.com/Could-not-reserve-enough-space-for-heap-in-JVM-tp22215608p22215608.html > > >> Sent from the Hadoop core-user mailing list archive at Nabble.com. > > >> > > >> > > > > > > > > > -- > "And when the night is cloudy, > There is still a light that shines on me, > Shine on until tomorrow, let it be." > -- http://daily.appspot.com/food/ CAUTION - Disclaimer * This e-mail contains PRIVILEGED AND CONFIDENTIAL INFORMATION intended solely for the use of the addressee(s). If you are not the intended recipient, please notify the sender by e-mail and delete the original message. Further, you are not to copy, disclose, or distribute this e-mail or its contents to any other person and any such actions are unlawful. This e-mail may contain viruses. Infosys has taken every reasonable precaution to minimize this risk, but is not liable for any damage you may sustain as a result of any virus in this e-mail. You should carry out your own virus checks before opening the e-mail or attachment. Infosys reserves the right to monitor and review the content of all messages sent to or from this e-mail address. Messages sent to or from this e-mail address may be stored on the Infosys e-mail system. ***INFOSYS End of Disclaimer INFOSYS***
Re: Could not reserve enough space for heap in JVM
I got a question relatived to the HADOOP_HEAPSIZE variable. My machine's memory size is 16G. but when i set HADOOP_HEAPSIZE to 4GB, it thrown the exception refered in this thread. how can i make full use of my mem. thx. 2009/2/26 Arijit Mukherjee > I was getting similar errors too while running the mapreduce samples. I > fiddled with the hadoop-env.sh (where the HEAPSIZE is specified) and the > hadoop-site.xml files - and rectified it after some trial and error. But I > would like to know if there is a thumb rule for this. Right now, I've a > core > duo machine with 2GB RAM running on Ubuntu 8.10, and I've found that a > HEAPSIZE of 256Mb works without any problems. Anything more than that would > give the same error (even when nothing else is going on in the machine). > > Arijit > > 2009/2/26 Anum Ali > > > If the solution given my Matei Zaharia wont work , which I guess it > > wont if you are using eclipse 3.3.0 because this is a bug , which they > > resloved it in later version which is eclipse 3.4 ganymede. Better > > upgrade eclipse version. > > > > > > > > > > On 2/26/09, Matei Zaharia wrote: > > > These variables have to be at runtime through a config file, not at > > compile > > > time. You can set them in hadoop-env.sh: Uncomment the line with export > > > HADOOP_HEAPSIZE= to set the heap size for all Hadoop > processes, > > or > > > change options for specific commands. Now these commands are for the > > Hadoop > > > processes themselves, but if you are getting the error in tasks you're > > > running, you can set these in your hadoop-site.xml through the > > > mapred.child.java.opts variable, as follows: > > > > > > mapred.child.java.opts > > > -Xmx512m > > > > > > > > > By the way I'm not sure if -J-Xmx is the right syntax; I've always seen > > -Xmx > > > and -Xms. > > > > > > On Wed, Feb 25, 2009 at 5:05 PM, madhuri72 wrote: > > > > > >> > > >> Hi, > > >> > > >> I'm trying to run hadoop version 19 on ubuntu with java build > > >> 1.6.0_11-b03. > > >> I'm getting the following error: > > >> > > >> Error occurred during initialization of VM > > >> Could not reserve enough space for object heap > > >> Could not create the Java virtual machine. > > >> make: *** [run] Error 1 > > >> > > >> I searched the forums and found some advice on setting the VM's memory > > via > > >> the javac options > > >> > > >> -J-Xmx512m or -J-Xms256m > > >> > > >> I have tried this with various sizes between 128 and 1024 MB. I am > > adding > > >> this tag when I compile the source. This isn't working for me, and > > >> allocating 1 GB of memory is a lot for the machine I'm using. Is > there > > >> some > > >> way to make this work with hadoop? Is there somewhere else I can set > > the > > >> heap memory? > > >> > > >> Thanks. > > >> > > >> > > >> > > >> > > >> > > >> -- > > >> View this message in context: > > >> > > > http://www.nabble.com/Could-not-reserve-enough-space-for-heap-in-JVM-tp22215608p22215608.html > > >> Sent from the Hadoop core-user mailing list archive at Nabble.com. > > >> > > >> > > > > > > > > > -- > "And when the night is cloudy, > There is still a light that shines on me, > Shine on until tomorrow, let it be." > -- http://daily.appspot.com/food/
Re: Could not reserve enough space for heap in JVM
I was getting similar errors too while running the mapreduce samples. I fiddled with the hadoop-env.sh (where the HEAPSIZE is specified) and the hadoop-site.xml files - and rectified it after some trial and error. But I would like to know if there is a thumb rule for this. Right now, I've a core duo machine with 2GB RAM running on Ubuntu 8.10, and I've found that a HEAPSIZE of 256Mb works without any problems. Anything more than that would give the same error (even when nothing else is going on in the machine). Arijit 2009/2/26 Anum Ali > If the solution given my Matei Zaharia wont work , which I guess it > wont if you are using eclipse 3.3.0 because this is a bug , which they > resloved it in later version which is eclipse 3.4 ganymede. Better > upgrade eclipse version. > > > > > On 2/26/09, Matei Zaharia wrote: > > These variables have to be at runtime through a config file, not at > compile > > time. You can set them in hadoop-env.sh: Uncomment the line with export > > HADOOP_HEAPSIZE= to set the heap size for all Hadoop processes, > or > > change options for specific commands. Now these commands are for the > Hadoop > > processes themselves, but if you are getting the error in tasks you're > > running, you can set these in your hadoop-site.xml through the > > mapred.child.java.opts variable, as follows: > > > > mapred.child.java.opts > > -Xmx512m > > > > > > By the way I'm not sure if -J-Xmx is the right syntax; I've always seen > -Xmx > > and -Xms. > > > > On Wed, Feb 25, 2009 at 5:05 PM, madhuri72 wrote: > > > >> > >> Hi, > >> > >> I'm trying to run hadoop version 19 on ubuntu with java build > >> 1.6.0_11-b03. > >> I'm getting the following error: > >> > >> Error occurred during initialization of VM > >> Could not reserve enough space for object heap > >> Could not create the Java virtual machine. > >> make: *** [run] Error 1 > >> > >> I searched the forums and found some advice on setting the VM's memory > via > >> the javac options > >> > >> -J-Xmx512m or -J-Xms256m > >> > >> I have tried this with various sizes between 128 and 1024 MB. I am > adding > >> this tag when I compile the source. This isn't working for me, and > >> allocating 1 GB of memory is a lot for the machine I'm using. Is there > >> some > >> way to make this work with hadoop? Is there somewhere else I can set > the > >> heap memory? > >> > >> Thanks. > >> > >> > >> > >> > >> > >> -- > >> View this message in context: > >> > http://www.nabble.com/Could-not-reserve-enough-space-for-heap-in-JVM-tp22215608p22215608.html > >> Sent from the Hadoop core-user mailing list archive at Nabble.com. > >> > >> > > > -- "And when the night is cloudy, There is still a light that shines on me, Shine on until tomorrow, let it be."
Re: Could not reserve enough space for heap in JVM
If the solution given my Matei Zaharia wont work , which I guess it wont if you are using eclipse 3.3.0 because this is a bug , which they resloved it in later version which is eclipse 3.4 ganymede. Better upgrade eclipse version. On 2/26/09, Matei Zaharia wrote: > These variables have to be at runtime through a config file, not at compile > time. You can set them in hadoop-env.sh: Uncomment the line with export > HADOOP_HEAPSIZE= to set the heap size for all Hadoop processes, or > change options for specific commands. Now these commands are for the Hadoop > processes themselves, but if you are getting the error in tasks you're > running, you can set these in your hadoop-site.xml through the > mapred.child.java.opts variable, as follows: > > mapred.child.java.opts > -Xmx512m > > > By the way I'm not sure if -J-Xmx is the right syntax; I've always seen -Xmx > and -Xms. > > On Wed, Feb 25, 2009 at 5:05 PM, madhuri72 wrote: > >> >> Hi, >> >> I'm trying to run hadoop version 19 on ubuntu with java build >> 1.6.0_11-b03. >> I'm getting the following error: >> >> Error occurred during initialization of VM >> Could not reserve enough space for object heap >> Could not create the Java virtual machine. >> make: *** [run] Error 1 >> >> I searched the forums and found some advice on setting the VM's memory via >> the javac options >> >> -J-Xmx512m or -J-Xms256m >> >> I have tried this with various sizes between 128 and 1024 MB. I am adding >> this tag when I compile the source. This isn't working for me, and >> allocating 1 GB of memory is a lot for the machine I'm using. Is there >> some >> way to make this work with hadoop? Is there somewhere else I can set the >> heap memory? >> >> Thanks. >> >> >> >> >> >> -- >> View this message in context: >> http://www.nabble.com/Could-not-reserve-enough-space-for-heap-in-JVM-tp22215608p22215608.html >> Sent from the Hadoop core-user mailing list archive at Nabble.com. >> >> >
Re: Could not reserve enough space for heap in JVM
These variables have to be at runtime through a config file, not at compile time. You can set them in hadoop-env.sh: Uncomment the line with export HADOOP_HEAPSIZE= to set the heap size for all Hadoop processes, or change options for specific commands. Now these commands are for the Hadoop processes themselves, but if you are getting the error in tasks you're running, you can set these in your hadoop-site.xml through the mapred.child.java.opts variable, as follows: mapred.child.java.opts -Xmx512m By the way I'm not sure if -J-Xmx is the right syntax; I've always seen -Xmx and -Xms. On Wed, Feb 25, 2009 at 5:05 PM, madhuri72 wrote: > > Hi, > > I'm trying to run hadoop version 19 on ubuntu with java build 1.6.0_11-b03. > I'm getting the following error: > > Error occurred during initialization of VM > Could not reserve enough space for object heap > Could not create the Java virtual machine. > make: *** [run] Error 1 > > I searched the forums and found some advice on setting the VM's memory via > the javac options > > -J-Xmx512m or -J-Xms256m > > I have tried this with various sizes between 128 and 1024 MB. I am adding > this tag when I compile the source. This isn't working for me, and > allocating 1 GB of memory is a lot for the machine I'm using. Is there > some > way to make this work with hadoop? Is there somewhere else I can set the > heap memory? > > Thanks. > > > > > > -- > View this message in context: > http://www.nabble.com/Could-not-reserve-enough-space-for-heap-in-JVM-tp22215608p22215608.html > Sent from the Hadoop core-user mailing list archive at Nabble.com. > >
Could not reserve enough space for heap in JVM
Hi, I'm trying to run hadoop version 19 on ubuntu with java build 1.6.0_11-b03. I'm getting the following error: Error occurred during initialization of VM Could not reserve enough space for object heap Could not create the Java virtual machine. make: *** [run] Error 1 I searched the forums and found some advice on setting the VM's memory via the javac options -J-Xmx512m or -J-Xms256m I have tried this with various sizes between 128 and 1024 MB. I am adding this tag when I compile the source. This isn't working for me, and allocating 1 GB of memory is a lot for the machine I'm using. Is there some way to make this work with hadoop? Is there somewhere else I can set the heap memory? Thanks. -- View this message in context: http://www.nabble.com/Could-not-reserve-enough-space-for-heap-in-JVM-tp22215608p22215608.html Sent from the Hadoop core-user mailing list archive at Nabble.com.
