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From "Manuel DE FERRAN (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-4548) M/R jobs can not access S3 if Kerberos is enabled
Date Fri, 10 Aug 2012 13:50:29 GMT
Manuel DE FERRAN created MAPREDUCE-4548:
-------------------------------------------

             Summary: M/R jobs can not access S3 if Kerberos is enabled
                 Key: MAPREDUCE-4548
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4548
             Project: Hadoop Map/Reduce
          Issue Type: Bug
            Reporter: Manuel DE FERRAN


With Kerberos enabled, any job that is taking as input or output s3 files fails.

It can be easily reproduced with wordcount shipped in hadoop-examples.jar and a public S3
file:
{code}
/opt/hadoop/bin/hadoop --config /opt/hadoop/conf/ jar /opt/hadoop/hadoop-examples-1.0.0.jar
wordcount s3n://ubikodpublic/test out01
{code}

returns:
{code}
12/08/10 12:40:19 INFO hdfs.DFSClient: Created HDFS_DELEGATION_TOKEN token 192 for hadoop
on 10.85.151.233:9000
12/08/10 12:40:19 INFO security.TokenCache: Got dt for hdfs://aws04.machine.com:9000/mapred/staging/hadoop/.staging/job_201208101229_0004;uri=10.85.151.233:9000;t.service=10.85.151.233:9000
12/08/10 12:40:19 INFO mapred.JobClient: Cleaning up the staging area hdfs://aws04.machine.com:9000/mapred/staging/hadoop/.staging/job_201208101229_0004
java.lang.IllegalArgumentException: java.net.UnknownHostException: ubikodpublic
        at org.apache.hadoop.security.SecurityUtil.buildTokenService(SecurityUtil.java:293)
        at org.apache.hadoop.security.SecurityUtil.buildDTServiceName(SecurityUtil.java:317)
        at org.apache.hadoop.fs.FileSystem.getCanonicalServiceName(FileSystem.java:189)
        at org.apache.hadoop.mapreduce.security.TokenCache.obtainTokensForNamenodesInternal(TokenCache.java:92)
        at org.apache.hadoop.mapreduce.security.TokenCache.obtainTokensForNamenodes(TokenCache.java:79)
        at org.apache.hadoop.mapreduce.lib.input.FileInputFormat.listStatus(FileInputFormat.java:197)
        at org.apache.hadoop.mapreduce.lib.input.FileInputFormat.getSplits(FileInputFormat.java:252)
<SNIP>
{code}

This patch seems to fix it.
{code}
Index: core/org/apache/hadoop/security/SecurityUtil.java
===================================================================
--- core/org/apache/hadoop/security/SecurityUtil.java   (révision 1305278)
+++ core/org/apache/hadoop/security/SecurityUtil.java   (copie de travail)
@@ -313,6 +313,9 @@
     if (authority == null || authority.isEmpty()) {
       return null;
     }
+    if (uri.getScheme().equals("s3n") || uri.getScheme().equals("s3")) {
+      return null;
+    }
     InetSocketAddress addr = NetUtils.createSocketAddr(authority, defPort);
     return buildTokenService(addr).toString();
    }
{code}


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