hadoop-common-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Ralph Castain <...@open-mpi.org>
Subject Re: Help with error
Date Mon, 09 Apr 2012 20:13:45 GMT
I'd be happy to do so - if I could only find the blasted definition of FileStatus!! Can you
point me to it?


On Apr 9, 2012, at 1:27 PM, Kihwal Lee wrote:

> It looks like the home directory does not exist but the copy went through.
> Can you try to LOG the key fields in destStatus including path? It might be ending up
in an unexpected place.
> 
> Kihwal
> 
> 
> 
> On 4/9/12 12:45 PM, "Ralph Castain" <rhc@open-mpi.org> wrote:
> 
> Hi Bobby
> 
> On Apr 9, 2012, at 11:40 AM, Robert Evans wrote:
> 
>> What do you mean by relocated some supporting files to HDFS?  How do you relocate
them?  What API do you use?
> 
> I use the LocalResource and FileSystem classes to do the relocation, per the Hadoop example:
> 
>        // set local resources for the application master
>        // local files or archives as needed
>        // In this scenario, the jar file for the application master is part of the local
resources
>        Map<String, LocalResource> localResources = new HashMap<String, LocalResource>();
> 
>        LOG.info("Copy openmpi tarball from local filesystem and add to local environment");
>        // Copy the application master jar to the filesystem
>        // Create a local resource to point to the destination jar path
>        FileSystem fs;
>        FileStatus destStatus;
>        try {
>            fs = FileSystem.get(conf);
>            Path src = new Path(pathOMPItarball);
>            String pathSuffix = appName + "/" + appId.getId();
>            Path dst = new Path(fs.getHomeDirectory(), pathSuffix);
>            try {
>                fs.copyFromLocalFile(false, true, src, dst);
>                try {
>                    destStatus = fs.getFileStatus(dst);
>                    LocalResource amJarRsrc = Records.newRecord(LocalResource.class);
> 
>                    // Set the type of resource - file or archive
>                    // archives are untarred at destination
>                    amJarRsrc.setType(LocalResourceType.ARCHIVE);
>                    // Set visibility of the resource
>                    // Setting to most private option
>                    amJarRsrc.setVisibility(LocalResourceVisibility.APPLICATION);
>                    // Set the resource to be copied over
>                    amJarRsrc.setResource(ConverterUtils.getYarnUrlFromPath(dst));
>                    // Set timestamp and length of file so that the framework
>                    // can do basic sanity checks for the local resource
>                    // after it has been copied over to ensure it is the same
>                    // resource the client intended to use with the application
>                    amJarRsrc.setTimestamp(destStatus.getModificationTime());
>                    amJarRsrc.setSize(destStatus.getLen());
>                    localResources.put("openmpi",  amJarRsrc);
>                } catch (Throwable t) {
>                    LOG.fatal("Error on file status", t);
>                    System.exit(1);
>                }
>            } catch (Throwable t) {
>                LOG.fatal("Error on copy from local file", t);
>                System.exit(1);
>            }
>        } catch (Throwable t) {
>            LOG.fatal("Error getting filesystem configuration", t);
>            System.exit(1);
>        }
> 
> Note that this appears to work fine when the local resource type was "file" - at least,
I was able to make a simple program work that way. Problem I'm having is when I move an archive,
which is why I was hoping to look at the HDFS end to see what files are present, and in what
locations so I can set the paths accordingly.
> 
> Thanks
> Ralph
> 
> 
>> 
>> --Bobby Evans
>> 
>> 
>> On 4/9/12 11:10 AM, "Ralph Castain" <rhc@open-mpi.org> wrote:
>> 
>> Hi folks
>> 
>> I'm trying to develop an AM for the 0.23 branch and running into a problem that I'm
having difficulty debugging. My client relocates some supporting files to HDFS, creates the
application object for the AM, and submits it to the RM.
>> 
>> The file relocation request doesn't generate an error, so I must assume it succeeded.
It would be nice if there was some obvious way to verify that, but I haven't discovered it.
Can anyone give me a hint? I tried asking hdfs to -ls, but all I get is that "." doesn't exist.
I have no idea where the file would be placed, if it would persist once the job fails, etc.
>> 
>> When the job is submitted, all I get is an "Error 500", which tells me nothing. Reminds
me of the old days of 40 years ago when you'd get the dreaded "error 11", which meant anything
from a divide by zero to a memory violation. Are there any debug flags I could set that might
provide more info?
>> 
>> Thanks
>> Ralph
>> 
>> 
> 
> 


Mime
View raw message