Hi,

 I am running a date command with YARN's distributed shell example in a
loop of 1000 times in this way:

yarn jar
/home/kbonagir/yarn/hadoop-2.0.0-alpha/share/hadoop/mapreduce/hadoop-yarn-applications-distributedshell-2.0.0-alpha.jar
org.apache.hadoop.yarn.applications.distributedshell.Client --jar
/home/kbonagir/yarn/hadoop-2.0.0-alpha/share/hadoop/mapreduce/hadoop-yarn-applications-distributedshell-2.0.0-alpha.jar
--shell_command date --num_containers 2
Around 730th time or so, I am getting an error in node manager's log saying
that it failed to launch container because there are "Too many open files"
and when I observe through lsof command,I find that there is one instance
of this kind of file is left for each run of Application Master, and it
kept growing as I am running it in loop.

node1:44871->node1:50010

Is this a known issue? Or am I missing doing something? Please help.

Note: I am working on hadoop--2.0.0-alpha

Thanks,
Kishore

Hi Kishore,

50010 is the datanode port. Does your lsof indicate that the sockets are in
CLOSE_WAIT?  I had come across an issue like this where that was a symptom.

-Sandy

On Wed, Mar 20, 2013 at 4:24 AM, Krishna Kishore Bonagiri <
[EMAIL PROTECTED]> wrote:

> Hi,
>
>  I am running a date command with YARN's distributed shell example in a
> loop of 1000 times in this way:
>
> yarn jar
> /home/kbonagir/yarn/hadoop-2.0.0-alpha/share/hadoop/mapreduce/hadoop-yarn-applications-distributedshell-2.0.0-alpha.jar
> org.apache.hadoop.yarn.applications.distributedshell.Client --jar
> /home/kbonagir/yarn/hadoop-2.0.0-alpha/share/hadoop/mapreduce/hadoop-yarn-applications-distributedshell-2.0.0-alpha.jar
> --shell_command date --num_containers 2
>
>
> Around 730th time or so, I am getting an error in node manager's log
> saying that it failed to launch container because there are "Too many open
> files" and when I observe through lsof command,I find that there is one
> instance of this kind of file is left for each run of Application Master,
> and it kept growing as I am running it in loop.
>
> node1:44871->node1:50010
>
> Is this a known issue? Or am I missing doing something? Please help.
>
> Note: I am working on hadoop--2.0.0-alpha
>
> Thanks,
> Kishore
>

There was an issue related to hung connections (HDFS-3357). But the JIRA
indicates the fix is available in Hadoop-2.0.0-alpha. Still, would be worth
checking on Sandy's suggestion
On Wed, Mar 20, 2013 at 11:09 PM, Sandy Ryza <[EMAIL PROTECTED]>wrote:

> Hi Kishore,
>
> 50010 is the datanode port. Does your lsof indicate that the sockets are
> in CLOSE_WAIT?  I had come across an issue like this where that was a
> symptom.
>
> -Sandy
>
>
> On Wed, Mar 20, 2013 at 4:24 AM, Krishna Kishore Bonagiri <
> [EMAIL PROTECTED]> wrote:
>
>> Hi,
>>
>>  I am running a date command with YARN's distributed shell example in a
>> loop of 1000 times in this way:
>>
>> yarn jar
>> /home/kbonagir/yarn/hadoop-2.0.0-alpha/share/hadoop/mapreduce/hadoop-yarn-applications-distributedshell-2.0.0-alpha.jar
>> org.apache.hadoop.yarn.applications.distributedshell.Client --jar
>> /home/kbonagir/yarn/hadoop-2.0.0-alpha/share/hadoop/mapreduce/hadoop-yarn-applications-distributedshell-2.0.0-alpha.jar
>> --shell_command date --num_containers 2
>>
>>
>> Around 730th time or so, I am getting an error in node manager's log
>> saying that it failed to launch container because there are "Too many open
>> files" and when I observe through lsof command,I find that there is one
>> instance of this kind of file is left for each run of Application Master,
>> and it kept growing as I am running it in loop.
>>
>> node1:44871->node1:50010
>>
>> Is this a known issue? Or am I missing doing something? Please help.
>>
>> Note: I am working on hadoop--2.0.0-alpha
>>
>> Thanks,
>> Kishore
>>
>
>