Home | About | Sematext search-lucene.com search-hadoop.com
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB
 Search Hadoop and all its subprojects:

Switch to Plain View
MapReduce >> mail # user >> hftp can list directories but won't send files


+
Robert Rapplean 2012-12-18, 22:43
+
Arpit Gupta 2012-12-18, 22:49
+
Robert Rapplean 2012-12-18, 23:05
Copy link to this message
-
Re: hftp can list directories but won't send files
What version/distribution of Hadoop is your source cluster?

Also, I'd take a look at a your NN's and a few of your DN's logs right
after encountering this issue, to see the reason+stacktrace printed
for the Server Error 500 (a code for a server-end fault). That'd give
us more ideas on whys.

On Wed, Dec 19, 2012 at 4:13 AM, Robert Rapplean
<[EMAIL PROTECTED]> wrote:
> Hey, everone. Just got finished reading about all of the unsubscribe messages in Sept-Oct, and was hoping someone has a clue about what my system is doing wrong. I suspect that this is a configuration issue, but I don't even know where to start looking for it. I'm a developer, and my sysadmin is tied up until the end of the year.
>
> I'm trying to move files from one cluster to another using distcp, using the hftp protocol as specified in their instructions.
>
> I can read directories over hftp, but when I attempt to get a file I get a 500 (internal server error). To eliminate the possibility of network and firewall issues, I'm using hadoop fs -ls and hadoop fs -cat commands on the source server in order to attempt to figure out this issue.
>
> This provides a directory of the files, which is correct.
>
> hadoop fs -ls ourlogs/day_id=19991231/hour_id=1999123123
> -rw-r--r--   3 username supergroup        812 2012-12-16 17:21 logfiles/day_id=19991231/hour_id=1999123123/000008_0
>
> This gives me a "file not found" error, which is also correct because the file isn't there:
>
> hadoop fs -cat hftp://hdenn00.trueffect.com:50070/user/username/logfiles/day_id=19991231/hour_id=1999123123/000008_0x
> cat: `hftp://hdenn00.trueffect.com:50070/user/prodman/ods_fail/day_id=19991231/hour_id=1999123123/000008_0x': No such file or directory
>
> This line gives me a 500 internal server error. The file is confirmed to be on the server.
>
> hadoop fs -cat hftp://hdenn00.trueffect.com:50070/user/username/logfiles/day_id=19991231/hour_id=1999123123/000008_0
> cat: HTTP_OK expected, received 500
>
> Here is a stack trace of what distcp logs when I attempt this:
>
> java.io.IOException: HTTP_OK expected, received 500
>     at org.apache.hadoop.hdfs.HftpFileSystem$RangeHeaderUrlOpener.connect(HftpFileSystem.java:365)
>     at org.apache.hadoop.hdfs.ByteRangeInputStream.openInputStream(ByteRangeInputStream.java:119)
>     at org.apache.hadoop.hdfs.ByteRangeInputStream.getInputStream(ByteRangeInputStream.java:103)
>     at org.apache.hadoop.hdfs.ByteRangeInputStream.read(ByteRangeInputStream.java:187)
>     at java.io.DataInputStream.read(DataInputStream.java:83)
>     at org.apache.hadoop.tools.DistCp$CopyFilesMapper.copy(DistCp.java:424)
>     at org.apache.hadoop.tools.DistCp$CopyFilesMapper.map(DistCp.java:547)
>     at org.apache.hadoop.tools.DistCp$CopyFilesMapper.map(DistCp.java:314)
>     at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:50)
>     at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:393)
>     at org.apache.hadoop.mapred.MapTask.run(MapTask.java:327)
>     at org.apache.hadoop.mapred.Child$4.run(Child.java:268)
>     at java.security.AccessController.doPrivileged(Native Method)
>     at javax.security.auth.Subject.doAs(Subject.java:396)
>     at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1332)
>     at org.apache.hadoop.mapred.Child.main(Child.java:262)
>
> Can someone tell me why hftp is failing to serve files, or at least where to look?
>

--
Harsh J
+
Robert Rapplean 2012-12-18, 23:28
+
Arpit Gupta 2012-12-19, 02:01
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB