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From "Keith Turner (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-826) MapReduce over accumlo fails if process that started job is killed
Date Fri, 19 Oct 2012 22:20:12 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-826?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13480449#comment-13480449
] 

Keith Turner commented on ACCUMULO-826:
---------------------------------------

bq. I propose we just revert to the 1.4.0 behavior of having base64 world-readable passwords
in the config for 1.4.2, and fix it properly in 1.5.0

I think this sounds reasonable.  The bug fix in 1.4.1 fixed and introduced bugs.  It slightly
improved security, but not in any dramatic way (i.e. using cryptography).    Also, I can not
find a way to delete the file when the job finishes as opposed to when the process that started
the job exits.  Does anyone know of a way to delete the file when the job exits?  If we were
to roll this back, should we roll back the changes to get and set ranges also?

bq.  using a shared secret (which I think Accumulo already has?)
Probably should not assume map reduce system can access accumulo's shared secret.  Christopher
and I discussed using a public key to encrypt the password.  Would need to find a standard
to use, its hard to get crypto protocols right.   But this is work for 1.5 I think.  
                
> MapReduce over accumlo fails if process that started job is killed
> ------------------------------------------------------------------
>
>                 Key: ACCUMULO-826
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-826
>             Project: Accumulo
>          Issue Type: Bug
>    Affects Versions: 1.4.1, 1.4.0
>            Reporter: Keith Turner
>            Priority: Critical
>
> While testing the 1.4.2rc2 I started a continuous verify and killed the process that
started the job.  Normally you would expect the job to keep running when you do this.  Howerver
task started to fail.  I was seeing errors like the following.
> {noformat}
> java.io.FileNotFoundException: File does not exist: /user/hadoop/ContinuousVerify_13506740685261350674068686.pw
> 	at org.apache.hadoop.hdfs.DFSClient$DFSInputStream.openInfo(DFSClient.java:1685)
> 	at org.apache.hadoop.hdfs.DFSClient$DFSInputStream.<init>(DFSClient.java:1676)
> 	at org.apache.hadoop.hdfs.DFSClient.open(DFSClient.java:479)
> 	at org.apache.hadoop.hdfs.DistributedFileSystem.open(DistributedFileSystem.java:187)
> 	at org.apache.hadoop.fs.FileSystem.open(FileSystem.java:418)
> 	at org.apache.accumulo.core.client.mapreduce.InputFormatBase.getPassword(InputFormatBase.java:681)
> 	at org.apache.accumulo.core.client.mapreduce.InputFormatBase$RecordReaderBase.initialize(InputFormatBase.java:1155)
> 	at org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader.initialize(MapTask.java:522)
> 	at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:763)
> 	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:370)
> 	at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
> 	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:1059)
> 	at org.apache.hadoop.mapred.Child.main(Child.java:249)
> {noformat}
> I think this is caused by the following code in InputFormatBase
> {code:java}
>   public static void setInputInfo(Configuration conf, String user, byte[] passwd, String
table, Authorizations auths) {
>     if (conf.getBoolean(INPUT_INFO_HAS_BEEN_SET, false))
>       throw new IllegalStateException("Input info can only be set once per job");
>     conf.setBoolean(INPUT_INFO_HAS_BEEN_SET, true);
>     
>     ArgumentChecker.notNull(user, passwd, table);
>     conf.set(USERNAME, user);
>     conf.set(TABLE_NAME, table);
>     if (auths != null && !auths.isEmpty())
>       conf.set(AUTHORIZATIONS, auths.serialize());
>     
>     try {
>       FileSystem fs = FileSystem.get(conf);
>       Path file = new Path(fs.getWorkingDirectory(), conf.get("mapred.job.name") + System.currentTimeMillis()
+ ".pw");
>       conf.set(PASSWORD_PATH, file.toString());
>       FSDataOutputStream fos = fs.create(file, false);
>       fs.setPermission(file, new FsPermission(FsAction.ALL, FsAction.NONE, FsAction.NONE));
>       fs.deleteOnExit(file);  // <--- NOT 100% sure, but I think this is the culprit
> {code}

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