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From Stack <st...@duboce.net>
Subject Re: startMiniDFSCluster and file permissions
Date Thu, 27 Oct 2011 22:41:19 GMT
Why don't we set DATA_DIR_PERMISSION_KEY to be permissive just before
we spin up minidfscluster?
St.Ack



On Thu, Oct 27, 2011 at 3:03 PM, Ted Yu <yuzhihong@gmail.com> wrote:
> I think Apache Jenkins doesn't have this problem - otherwise we should have
> seen it by now.
>
> FYI:
> http://www.avajava.com/tutorials/lessons/how-do-i-set-the-default-file-and-directory-permissions.html
>
> On Thu, Oct 27, 2011 at 2:53 PM, lars hofhansl <lhofhansl@yahoo.com> wrote:
>
>> I just noticed today that I could not run any test that starts a
>> MiniDFSCluster.
>>
>> The exception I got was this:
>> java.lang.NullPointerException
>>         at
>> org.apache.hadoop.hdfs.MiniDFSCluster.startDataNodes(MiniDFSCluster.java:422)
>>         at
>> org.apache.hadoop.hdfs.MiniDFSCluster.<init>(MiniDFSCluster.java:280)
>>         at
>> org.apache.hadoop.hbase.HBaseTestingUtility.startMiniDFSCluster(HBaseTestingUtility.java:350)
>>         at
>> org.apache.hadoop.hbase.HBaseTestingUtility.startMiniCluster(HBaseTestingUtility.java:519)
>>         at
>> org.apache.hadoop.hbase.HBaseTestingUtility.startMiniCluster(HBaseTestingUtility.java:475)
>>         at
>> org.apache.hadoop.hbase.HBaseTestingUtility.startMiniCluster(HBaseTestingUtility.java:462)
>>
>> In the logs I had:
>> 2011-10-27 14:17:48,238 WARN  [main] datanode.DataNode(1540): Invalid
>> directory in dfs.data.dir: Incorrect permission for
>> /home/lars/dev/hbase-trunk/target/test-data/8f8d2437-1d9a-42fa-b7c3-c154d8e559f3/dfscluster_557b48bc-9c8e-4a47-b74e-4c0167710237/dfs/data/data1,
>> expected: rwxr-xr-x, while actual: rwxrwxr-x
>> 2011-10-27 14:17:48,260 WARN  [main] datanode.DataNode(1540): Invalid
>> directory in dfs.data.dir: Incorrect permission for
>> /home/lars/dev/hbase-trunk/target/test-data/8f8d2437-1d9a-42fa-b7c3-c154d8e559f3/dfscluster_557b48bc-9c8e-4a47-b74e-4c0167710237/dfs/data/data2,
>> expected: rwxr-xr-x, while actual: rwxrwxr-x
>> 2011-10-27 14:17:48,261 ERROR [main] datanode.DataNode(1546): All
>> directories in dfs.data.dir are invalid.
>>
>>
>> And indeed I see this in
>> org.apache.hadoop.hdfs.server.datanode.DataNode.makeInstance(...):
>>
>>     FsPermission dataDirPermission =
>>       new FsPermission(conf.get(DATA_DIR_PERMISSION_KEY,
>>                                 DEFAULT_DATA_DIR_PERMISSION));
>>     for (String dir : dataDirs) {
>>       try {
>>         DiskChecker.checkDir(localFS, new Path(dir), dataDirPermission);
>>         dirs.add(new File(dir));
>>       } catch(IOException e) {
>>         LOG.warn("Invalid directory in " + DATA_DIR_KEY +  ": " +
>>                  e.getMessage());
>>       }
>>     }
>>
>>
>> (where DEFAULT_DATA_DIR_PERMISSION is 755)
>>
>>
>> The default umask on my machine is 0002, so that would seem to explain the
>> discrepancy.
>>
>> Changing my umask to 0022 fixed the problem!
>> I cannot be the only one seeing this. This is just a heads for anyone who
>> runs into this, as I wasted over an hour on this.
>>
>> I assume this is due to the switch to hadoop 0.20.205.
>>
>> As I am fairly ignorant about Maven... Is there a way to set the default
>> umask automatically for the test processes?
>>
>> -- Lars
>>
>>
>

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