FAQ
Hi,


I am getting error while trying to start JobTracker from Cloudera Manager CHD 4. I tried executing cmd "hadoop fs -chmod 755 / " but still getting same error. Can anyone please let me know the reason for this.


org.apache.hadoop.security.AccessControlException: Permission denied: user=mapred, access=WRITE, inode="/":hdfs:supergroup:drwxr-xr-x
  at org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.check(FSPermissionChecker.java:205)
  at org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.check(FSPermissionChecker.java:186)
  at org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.checkPermission(FSPermissionChecker.java:135)
  at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkPermission(FSNamesystem.java:4547)
  at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkAncestorAccess(FSNamesystem.java:4518)
  at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.mkdirsInternal(FSNamesystem.java:2880)
  at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.mkdirsInt(FSNamesystem.java:2844)
  at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.mkdirs(FSNamesystem.java:2823)

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  • Vikram Srivastava at May 29, 2013 at 11:46 pm
    You need to goto your NN's page in CM UI and run "Create /tmp directory"
    from "Actions" menu before you can use MapReduce.
    On Wed, May 29, 2013 at 4:44 PM, Manoj wrote:

    Hi,


    I am getting error while trying to start JobTracker from Cloudera Manager CHD 4. I tried executing cmd "hadoop fs -chmod 755 / " but still getting same error. Can anyone please let me know the reason for this.


    org.apache.hadoop.security.AccessControlException: Permission denied: user=mapred, access=WRITE, inode="/":hdfs:supergroup:drwxr-xr-x
    at org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.check(FSPermissionChecker.java:205)
    at org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.check(FSPermissionChecker.java:186)
    at org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.checkPermission(FSPermissionChecker.java:135)
    at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkPermission(FSNamesystem.java:4547)
    at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkAncestorAccess(FSNamesystem.java:4518)
    at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.mkdirsInternal(FSNamesystem.java:2880)
    at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.mkdirsInt(FSNamesystem.java:2844)
    at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.mkdirs(FSNamesystem.java:2823)


  • Manoj Sah at May 29, 2013 at 11:52 pm
    Thanks a lot Vikram!
    It worked like a miracle :)

    On Wed, May 29, 2013 at 4:46 PM, Vikram Srivastava wrote:

    You need to goto your NN's page in CM UI and run "Create /tmp directory"
    from "Actions" menu before you can use MapReduce.

    On Wed, May 29, 2013 at 4:44 PM, Manoj wrote:

    Hi,


    I am getting error while trying to start JobTracker from Cloudera Manager CHD 4. I tried executing cmd "hadoop fs -chmod 755 / " but still getting same error. Can anyone please let me know the reason for this.


    org.apache.hadoop.security.AccessControlException: Permission denied: user=mapred, access=WRITE, inode="/":hdfs:supergroup:drwxr-xr-x
    at org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.check(FSPermissionChecker.java:205)

    at org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.check(FSPermissionChecker.java:186)
    at org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.checkPermission(FSPermissionChecker.java:135)
    at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkPermission(FSNamesystem.java:4547)

    at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkAncestorAccess(FSNamesystem.java:4518)
    at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.mkdirsInternal(FSNamesystem.java:2880)
    at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.mkdirsInt(FSNamesystem.java:2844)

    at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.mkdirs(FSNamesystem.java:2823)


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postedMay 29, '13 at 11:44p
activeMay 29, '13 at 11:52p
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Manoj Sah: 2 posts Vikram Srivastava: 1 post

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