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From "Venkatesh Seetharam (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FALCON-910) Better error messages when creating cluster's directories
Date Wed, 26 Nov 2014 19:10:12 GMT

    [ https://issues.apache.org/jira/browse/FALCON-910?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14226667#comment-14226667
] 

Venkatesh Seetharam commented on FALCON-910:
--------------------------------------------

Instead of confusing the user, we should take one dir and then create staging and working
sub  dirs underneath. We need only one and copy libs under that itself. Temp and working are
redundant IMO, less is better.

> Better error messages when creating cluster's directories
> ---------------------------------------------------------
>
>                 Key: FALCON-910
>                 URL: https://issues.apache.org/jira/browse/FALCON-910
>             Project: Falcon
>          Issue Type: Improvement
>          Components: client
>    Affects Versions: 0.7
>            Reporter: Adam Kawa
>            Assignee: karan kumar
>            Priority: Minor
>
> I followed the example from http://hortonworks.com/blog/introduction-apache-falcon-hadoop,
where all locations (i.e. staging, working, temp) of the cluster are set to the same directory.
> {code}
> <?xml version="1.0" encoding="UTF-8"?>
> <cluster colo="toronto" description="Primary Cluster"
> (...)
>     <locations>
>         <location name="staging" path="/tmp/falcon"/>
>         <location name="working" path="/tmp/falcon"/>
>         <location name="temp" path="/tmp/falcon"/>
>     </locations>
> </cluster>
> {code}
> When submitting such a cluster entity, I got:
> {code}
> bash-4.1$ ./bin/falcon entity -submit -type cluster -file cluster.xml
> Stacktrace:
> org.apache.falcon.client.FalconCLIException: Bad Request;Path /tmp/falcon has permissions:
rwxr-xr-x, should be rwxrwxrwx
> 	at org.apache.falcon.client.FalconCLIException.fromReponse(FalconCLIException.java:44)
> 	at org.apache.falcon.client.FalconClient.checkIfSuccessful(FalconClient.java:1162)
> 	at org.apache.falcon.client.FalconClient.sendEntityRequestWithObject(FalconClient.java:684)
> 	at org.apache.falcon.client.FalconClient.submit(FalconClient.java:323)
> 	at org.apache.falcon.cli.FalconCLI.entityCommand(FalconCLI.java:361)
> 	at org.apache.falcon.cli.FalconCLI.run(FalconCLI.java:182)
> 	at org.apache.falcon.cli.FalconCLI.main(FalconCLI.java:132)
> bash-4.1$ ./bin/falcon entity -submit -type cluster -file cluster.xml
> Stacktrace:
> org.apache.falcon.client.FalconCLIException: Bad Request;Path /tmp/falcon has permissions:
rwxrwxrwx, should be rwxr-xr-x
> 	at org.apache.falcon.client.FalconCLIException.fromReponse(FalconCLIException.java:44)
> 	at org.apache.falcon.client.FalconClient.checkIfSuccessful(FalconClient.java:1162)
> 	at org.apache.falcon.client.FalconClient.sendEntityRequestWithObject(FalconClient.java:684)
> 	at org.apache.falcon.client.FalconClient.submit(FalconClient.java:323)
> 	at org.apache.falcon.cli.FalconCLI.entityCommand(FalconCLI.java:361)
> 	at org.apache.falcon.cli.FalconCLI.run(FalconCLI.java:182)
> 	at org.apache.falcon.cli.FalconCLI.main(FalconCLI.java:132)
> {code}
> I can change these permission forever with the same effect :)
> According to https://github.com/apache/incubator-falcon/blob/master/common/src/main/java/org/apache/falcon/entity/parser/ClusterEntityParser.java
> {code}
> for (Location location : cluster.getLocations().getLocations()) {
>             final String locationName = location.getName();
>             if (locationName.equals("temp")) {
>                 continue;
>             }
>             try {
>                 checkPathOwnerAndPermission(cluster.getName(), location.getPath(), fs,
>                         "staging".equals(locationName)
>                                 ? HadoopClientFactory.ALL_PERMISSION
>                                 : HadoopClientFactory.READ_EXECUTE_PERMISSION);
>             } catch (IOException e) {
> (...)
>             }
>         }
> {code}
> This basically means:
> * staging directory must have exactly ALL permissions
> * execute directory must have exactly READ_EXECUTE permissions
> If the staging and execute directories are the same, then we have the misconfiguration
that is hard to detect based on the current message.
> Therefore:
> * a better (less confusing) message could be printed
> * or, code could be fixed that execute directory should have at least (not exactly) READ_EXECUTE
permissions.



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