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Hadoop, mail # dev - Help with error


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Re: Help with error
Ralph Castain 2012-04-09, 20:13
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" <[EMAIL PROTECTED]> 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" <[EMAIL PROTECTED]> 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.