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Date: Wed, 31 Dec 2008 13:05:54 -0800
From: Raghu Angadi <rangadi@yahoo-inc.com>
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To: core-user@hadoop.apache.org
Subject: Re: cannot allocate memory error
References: <b56bac7f0812310616u5e75e39v7149658f6cd7bdda@mail.gmail.com>
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Your OS is running out of memory. Usually a sign of too many processes 
(or threads) on the machine. Check what else is happening on the system.

Raghu.

sagar arlekar wrote:
> Hello,
> 
> I am new to hadoop. I am running hapdoop 0.17 in a Eucalyptus cloud
> instance (its a centos image on xen)
> 
> bin/hadoop dfs -ls /
> gives the following Exception
> 
> 08/12/31 08:58:10 WARN fs.FileSystem: "localhost:9000" is a deprecated
> filesystem name. Use "hdfs://localhost:9000/" instead.
> 08/12/31 08:58:10 WARN fs.FileSystem: uri=hdfs://localhost:9000
> javax.security.auth.login.LoginException: Login failed: Cannot run
> program "whoami": java.io.IOException: error=12, Cannot allocate
> memory
>         at org.apache.hadoop.security.UnixUserGroupInformation.login(UnixUserGroupInformation.java:250)
>         at org.apache.hadoop.security.UnixUserGroupInformation.login(UnixUserGroupInformation.java:275)
>         at org.apache.hadoop.security.UnixUserGroupInformation.login(UnixUserGroupInformation.java:257)
>         at org.apache.hadoop.security.UserGroupInformation.login(UserGroupInformation.java:67)
>         at org.apache.hadoop.fs.FileSystem$Cache$Key.<init>(FileSystem.java:1353)
>         at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:1289)
>         at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:203)
>         at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:108)
>         at org.apache.hadoop.fs.FsShell.init(FsShell.java:87)
>         at org.apache.hadoop.fs.FsShell.run(FsShell.java:1717)
>         at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
>         at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79)
>         at org.apache.hadoop.fs.FsShell.main(FsShell.java:1866)
> Bad connection to FS. command aborted.
> 
> Running the command again gives.
> bin/hadoop dfs -ls /
> Error occurred during initialization of VM
> Could not reserve enough space for object heap
> 
> Changing value of 'mapred.child.java.opts' property in hadoop-site.xml
> did not help.
> 
> Kindly help me. What could I do to give more memory to hadoop?
> 
> BTW is there a way to search through the mail archive? I only saw the
> mails listed according to year and months.
> 
> Regards,
> Sagar