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From "FKorning (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8274) In pseudo or cluster model under Cygwin, tasktracker can not create a new job because of symlink problem.
Date Wed, 18 Apr 2012 11:35:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8274?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13256454#comment-13256454
] 

FKorning commented on HADOOP-8274:
----------------------------------

see https://issues.apache.org/jira/browse/HADOOP-7682

as mentioned, java io doesn't understand symlinks or junctions.

the workaround is to ensure that your windows and cygwin paths are equal.
Create a /cygwin symlink pointing back to the cygwin root ( /cygwin -> / )
Use driveless paths and use the cygwin tmp dir for your hadoop_tmp_dir.

hadoop_tmp_dir=/cygwin/tmp/hadoop-cyg_server  <==> c:\cygwin\tmp\hadoop-cyg_server


                
> In pseudo or cluster model under Cygwin, tasktracker can not create a new job because
of symlink problem.
> ---------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-8274
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8274
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 0.20.205.0, 1.0.0, 1.0.1, 0.22.0
>         Environment: windows7+cygwin 1.7.11-1+jdk1.6.0_31+hadoop 1.0.0
>            Reporter: tim.wu
>
> The standalone model is ok. But, in pseudo or cluster model, it always throw errors,
even I just run wordcount example.
> The HDFS works fine, but tasktracker can not create threads(jvm) for new job.  It is
empty under /logs/userlogs/job-xxxx/attempt-xxxx/.
> The reason looks like that in windows, Java can not recognize a symlink of folder as
a folder. 
> The detail description is as following,
> ======================================================================================================
> First, the error log of tasktracker is like:
> ======================
> 12/03/28 14:35:13 INFO mapred.JvmManager: In JvmRunner constructed JVM ID: jvm_201203280212_0005_m_-1386636958
> 12/03/28 14:35:13 INFO mapred.JvmManager: JVM Runner jvm_201203280212_0005_m_-1386636958
spawned.
> 12/03/28 14:35:17 INFO mapred.JvmManager: JVM Not killed jvm_201203280212_0005_m_-1386636958
but just removed
> 12/03/28 14:35:17 INFO mapred.JvmManager: JVM : jvm_201203280212_0005_m_-1386636958 exited
with exit code -1. Number of tasks it ran: 0
> 12/03/28 14:35:17 WARN mapred.TaskRunner: attempt_201203280212_0005_m_000002_0 : Child
Error
> java.io.IOException: Task process exit with nonzero status of -1.
>         at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:258)
> 12/03/28 14:35:21 INFO mapred.TaskTracker: addFreeSlot : current free slots : 2
> 12/03/28 14:35:24 INFO mapred.TaskTracker: LaunchTaskAction (registerTask): attempt_201203280212_0005_m_000002_1
task's state:UNASSIGNED
> 12/03/28 14:35:24 INFO mapred.TaskTracker: Trying to launch : attempt_201203280212_0005_m_000002_1
which needs 1 slots
> 12/03/28 14:35:24 INFO mapred.TaskTracker: In TaskLauncher, current free slots : 2 and
trying to launch attempt_201203280212_0005_m_000002_1 which needs 1 slots
> 12/03/28 14:35:24 WARN mapred.TaskLog: Failed to retrieve stdout log for task: attempt_201203280212_0005_m_000002_0
> java.io.FileNotFoundException: D:\cygwin\home\timwu\hadoop-1.0.0\logs\userlogs\job_201203280212_0005\attempt_201203280212_0005_m_000002_0\log.index
(The system cannot find the path specified)
>         at java.io.FileInputStream.open(Native Method)
>         at java.io.FileInputStream.<init>(FileInputStream.java:120)
>         at org.apache.hadoop.io.SecureIOUtils.openForRead(SecureIOUtils.java:102)
>         at org.apache.hadoop.mapred.TaskLog.getAllLogsFileDetails(TaskLog.java:188)
>         at org.apache.hadoop.mapred.TaskLog$Reader.<init>(TaskLog.java:423)
>         at org.apache.hadoop.mapred.TaskLogServlet.printTaskLog(TaskLogServlet.java:81)
>         at org.apache.hadoop.mapred.TaskLogServlet.doGet(TaskLogServlet.java:296)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
>         at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
>         at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1221)
>         at org.apache.hadoop.http.HttpServer$QuotingInputFilter.doFilter(HttpServer.java:835)
>         at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
>         at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:399)
>         at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
>         at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
>         at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)
>         at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:450)
>         at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
>         at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
>         at org.mortbay.jetty.Server.handle(Server.java:326)
>         at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
>         at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:928)
>         at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:549)
>         at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
>         at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
>         at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410)
>         at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
> 12/03/28 14:35:24 WARN mapred.TaskLog: Failed to retrieve stderr log for task: attempt_201203280212_0005_m_000002_0
> java.io.FileNotFoundException: D:\cygwin\home\timwu\hadoop-1.0.0\logs\userlogs\job_201203280212_0005\attempt_201203280212_0005_m_000002_0\log.index
(The system cannot find the path specified)
>         at java.io.FileInputStream.open(Native Method)
>         at java.io.FileInputStream.<init>(FileInputStream.java:120)
>         at org.apache.hadoop.io.SecureIOUtils.openForRead(SecureIOUtils.java:102)
>         at org.apache.hadoop.mapred.TaskLog.getAllLogsFileDetails(TaskLog.java:188)
>         at org.apache.hadoop.mapred.TaskLog$Reader.<init>(TaskLog.java:423)
>         at org.apache.hadoop.mapred.TaskLogServlet.printTaskLog(TaskLogServlet.java:81)
>         at org.apache.hadoop.mapred.TaskLogServlet.doGet(TaskLogServlet.java:296)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
>         at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
>         at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1221)
>         at org.apache.hadoop.http.HttpServer$QuotingInputFilter.doFilter(HttpServer.java:835)
>         at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
>         at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:399)
>         at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
>         at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
>         at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)
>         at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:450)
>         at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
>         at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
>         at org.mortbay.jetty.Server.handle(Server.java:326)
>         at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
>         at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:928)
>         at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:549)
>         at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
>         at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
>         at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410)
>         at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
> =======================================
> I've tried to remote debug tasktracker. In 
> org.apache.hadoop.mapredTaskLog.createTaskAttemptLogDir(TaskAttemptID, boolean, String[])
line: 97:
> public static void createTaskAttemptLogDir(TaskAttemptID taskID,
>       boolean isCleanup, String[] localDirs) throws IOException{
>     String cleanupSuffix = isCleanup ? ".cleanup" : "";
>     String strAttemptLogDir = getTaskAttemptLogDir(taskID, 
>         cleanupSuffix, localDirs);
>     File attemptLogDir = new File(strAttemptLogDir);
>     if (!attemptLogDir.mkdirs()) {
>       throw new IOException("Creation of " + attemptLogDir + " failed.");
>     }
>     String strLinkAttemptLogDir = 
>         getJobDir(taskID.getJobID()).getAbsolutePath() + File.separatorChar + 
>         taskID.toString() + cleanupSuffix;
>     if (FileUtil.symLink(strAttemptLogDir, strLinkAttemptLogDir) != 0) {
>       throw new IOException("Creation of symlink from " + 
>                             strLinkAttemptLogDir + " to " + yestrAttemptLogDir +
>                             " failed.");
>     }
>     //Set permissions for target attempt log dir 
>     FsPermission userOnly = new FsPermission((short) 0777); //FsPermission userOnly =
new FsPermission((short) 0700);
>     FileUtil.setPermission(attemptLogDir, userOnly);
>   }
> and  symlink() function
> public static int symLink(String target, String linkname) throws IOException{
>     String cmd = "ln -s " + target + " " + linkname;
>     Process p = Runtime.getRuntime().exec(cmd, null);
>     int returnVal = -1;
>     try{
>       returnVal = p.waitFor();
>     } catch(InterruptedException e){
>       //do nothing as of yet
>     }
>     if (returnVal != 0) {
>       LOG.warn("Command '" + cmd + "' failed " + returnVal + 
>                " with: " + copyStderr(p));
>     }
>     return returnVal;
>   }
> we know hadoop will create a log folder in ${hadoop.tmp.dir},  and then invoke "ln -s
" to create its symlink under /logs/userlog/job-xxx/attermp-xxxx. 
> In my case, 
> strLinkAttemptLogDir = D:\cygwin\home\timwu\hadoop-1.0.0\logs\userlogs\job_201203280212_0005\attempt_201203280212_0005_m_000002_1
> strAttemptLogDir=/tmp/hadoop-timwu/mapred/local\userlogs\job_201203280212_0005\attempt_201203280212_0005_m_000002_1
> After a subtrack is created by tasktracker, it runs error in the following function:
> in org.apache.hadoop.mapred.java , DefaultTaskController.launchTask(String, String, String,
List<String>, List<String>, File, String, String) line: 107        
>       ...............
>       //mkdir the loglocation
>       String logLocation = TaskLog.getAttemptDir(jobId, attemptId).toString();
>       if (!localFs.mkdirs(new Path(logLocation))) {
>         throw new IOException("Mkdirs failed to create " 
>                    + logLocation);
>       }
>      ..............
> mkdir() return false, because logLocation is a symlink file. In my case, it is ogLocation=D:\cygwin\home\timwu\hadoop-1.0.0\logs\userlogs\job_201203280212_0005\attempt_201203280212_0005_m_000002_1.
 If I open it from explorer in windows, it is just a file,  but not a folder or shortcut.
And its content is like,
>          <symlink>/tmp/hadoop-timwu/mapred/local\userlogs\job_201203280212_0005\attempt_201203280212_0005_m_000002_1

> Because the mkdir() is
> public boolean mkdirs(Path f) throws IOException {
>     Path parent = f.getParent();
>     File p2f = pathToFile(f);
>     return (parent == null || mkdirs(parent)) &&
>       (p2f.mkdir() || p2f.isDirectory());
>   }
> So, p2f.isDirectory returns false.  And p2f.isFile will return true. So, for java, it
is a file. Hence, IOException("Mkdirs failed to create D:\cygwin\home\timwu\hadoop-1.0.0\logs\userlogs\job_201203280212_0005\attempt_201203280212_0005_m_000001_1")
> will be throws in child threads, and return -1.  Then, we will get the above exception
in main thread.
> Is it any way to close this symlink? Or any other way I can follow?
> BTW, in core-site.xml, I set  hadoop.tmp.dir = /tmp/hadoop-${user.name},  and my $User.name
is timwu. So, it should create a tmp folder /tmp/hadoop-timwu  under cygwin's.   However,
in deed , it create  a folder of d:/tmp/hadoop-timwu. If in cygwin, it is /cygdriver/d/tmp/hadoop-timwu.
 Is it correct?

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