阅读612 返回首页    go 阿里云

Java沙箱__MapReduce_大数据计算服务-阿里云

MaxCompute MapReduce及UDF程序在分布式环境中运行时受到Java沙箱的限制(MapReduce作业的主程序则不受此限制)，具体限制如下：

  • 不允许直接访问本地文件，只能通过 MaxCompute MapReduce/Graph提供的接口间接访问： 读取- -resources选项指定的资源，包括文件、Jar包和资源表等； 通过System.out和System.err输出日志信息，可以通过ODPS客户端的 Log 命令查看日志信息；
  • 不允许直接访问分布式文件系统，只能透过ODPS MapReduce/Graph访问到表的记录:
  • 不允许JNI调用限制；
  • 不允许创建Java线程，不允许起子进程执行Linux命令；
  • 不允许访问网络，包括获取本地IP地址等等都会被禁止；
  • Java反射限制，”suppressAccessChecks”权限被禁止，无法setAccessible某个private的属性或方法，以达到读取private属性或调用private方法的目的。

具体的说，在用户代码中直接使用下面这些方法会抛”access denied”异常：

访问本地文件相关方法

java.io.File:

  1.       public boolean delete()
  2.       public void deleteOnExit()
  3.       public boolean exists()
  4.       public boolean canRead()
  5.       public boolean isFile()
  6.       public boolean isDirectory()
  7.       public boolean isHidden()
  8.       public long lastModified()
  9.       public long length()
  10.       public String[] list()
  11.       public String[] list(FilenameFilter filter)
  12.       public File[] listFiles()
  13.       public File[] listFiles(FilenameFilter filter)
  14.       public File[] listFiles(FileFilter filter)
  15.       public boolean canWrite()
  16.       public boolean createNewFile()
  17.       public static File createTempFile(String prefix, String suffix)
  18.       public static File createTempFile(String prefix,  String suffix,File directory)
  19.       public boolean mkdir()
  20.       public boolean mkdirs()
  21.       public boolean renameTo(File dest)
  22.       public boolean setLastModified(long time)
  23.       public boolean setReadOnly()

java.io.RandomAccessFile:

  1.       RandomAccessFile(String name, String mode)
  2.       RandomAccessFile(File file, String mode)

java.io.FileInputStream:

  1.       FileInputStream(FileDescriptor fdObj)
  2.       FileInputStream(String name)
  3.       FileInputStream(File file)

java.io.FileOutputStream:

  1.       FileOutputStream(FileDescriptor fdObj)
  2.       FileOutputStream(File file)
  3.       FileOutputStream(String name)
  4.       FileOutputStream(String name, boolean append)

java.lang.Class:

  1.     public ProtectionDomain getProtectionDomain()

java.lang.ClassLoader:

  1.     ClassLoader()
  2.     ClassLoader(ClassLoader parent)

java.lang.Runtime:

  1.     public Process exec(String command)
  2.     public Process exec(String command, String envp[])
  3.     public Process exec(String cmdarray[])
  4.     public Process exec(String cmdarray[], String envp[])
  6.     public void exit(int status)
  7.     public static void runFinalizersOnExit(boolean value)
  9.     public void addShutdownHook(Thread hook)
  10.     public boolean removeShutdownHook(Thread hook)
  12.     public void load(String lib)
  13.     public void loadLibrary(String lib)

java.lang.System:

  1.     public static void exit(int status)
  2.     public static void runFinalizersOnExit(boolean value)
  4.     public static void load(String filename)
  5.     public static void loadLibrary( String libname)
  7.     public static Properties getProperties()
  8.     public static void setProperties(Properties props)
  9.     public static String getProperty(String key) // 只允许部分key可以访问
  10.     public static String getProperty(String key, String def) // 只允许部分key可以访问
  11.     public static String setProperty(String key, String value)
  13.     public static void setIn(InputStream in)
  14.     public static void setOut(PrintStream out)
  15.     public static void setErr(PrintStream err)
  17.     public static synchronized void setSecurityManager(SecurityManager s)

System.getProperty允许的key列表如下：

  1.     java.version
  2.     java.vendor
  3.     java.vendor.url
  4.     java.class.version
  5.     os.name
  6.     os.version
  7.     os.arch
  8.     file.separator
  9.     path.separator
  10.     line.separator
  12.     java.specification.version
  13.     java.specification.vendor
  14.     java.specification.name
  16.     java.vm.specification.version
  17.     java.vm.specification.vendor
  18.     java.vm.specification.name
  19.     java.vm.version
  20.     java.vm.vendor
  21.     java.vm.name
  22.     file.encoding
  23.     user.timezone

java.lang.Thread:

  1.     Thread()
  2.     Thread(Runnable target)
  3.     Thread(String name)
  4.     Thread(Runnable target, String name)
  5.     Thread(ThreadGroup group, ...)
  7.     public final void checkAccess()
  8.     public void interrupt()
  9.     public final void suspend()
  10.     public final void resume()
  11.     public final void setPriority (int newPriority)
  12.     public final void setName(String name)
  13.     public final void setDaemon(boolean on)
  14.     public final void stop()
  15.     public final synchronized void stop(Throwable obj)
  17.     public static int enumerate(Thread tarray[])
  18.     public void setContextClassLoader(ClassLoader cl)

java.lang.ThreadGroup:

  1.     ThreadGroup(String name)
  2.     ThreadGroup(ThreadGroup parent, String name)
  4.     public final void checkAccess()
  5.     public int enumerate(Thread list[])
  6.     public int enumerate(Thread list[], boolean recurse)
  7.     public int enumerate(ThreadGroup list[])
  8.     public int enumerate(ThreadGroup list[], boolean recurse)
  9.     public final ThreadGroup getParent()
  10.     public final void setDaemon(boolean daemon)
  11.     public final void setMaxPriority(int pri)
  12.     public final void suspend()
  13.     public final void resume()
  14.     public final void destroy()
  16.     public final void interrupt()
  17.     public final void stop()

java.lang.reflect.AccessibleObject:

  1.     public static void setAccessible(...)
  2.     public void setAccessible(...)

java.net.InetAddress:

  1.     public String getHostName()
  2.     public static InetAddress[] getAllByName(String host)
  3.     public static InetAddress getLocalHost()

java.net.DatagramSocket:

  1.     public InetAddress getLocalAddress()

java.net.Socket:

  1.     Socket(...)

java.net.ServerSocket:

  1.     ServerSocket(...)
  2.     public Socket accept()
  3.     protected final void implAccept(Socket s)
  4.     public static synchronized void setSocketFactory(...)
  5.     public static synchronized void setSocketImplFactory(...)

java.net.DatagramSocket:

  1.     DatagramSocket(...)
  2.     public synchronized void receive(DatagramPacket p)

java.net.MulticastSocket:

  1.     MulticastSocket(...)

java.net.URL:

  1.     URL(...)
  2.     public static synchronized void setURLStreamHandlerFactory(...)
  3.     java.net.URLConnection
  4.     public static synchronized void setContentHandlerFactory(...)
  5.     public static void setFileNameMap(FileNameMap map)

java.net.HttpURLConnection:

  1.     public static void setFollowRedirects(boolean set)
  2.     java.net.URLClassLoader
  3.     URLClassLoader(...)

java.security.AccessControlContext:

  1.     public AccessControlContext(AccessControlContext acc, DomainCombiner combiner)
  2.     public DomainCombiner getDomainCombiner()

最后更新：2016-06-22 13:00:14

  上一篇：go 本地运行__功能介绍_MapReduce_大数据计算服务-阿里云
  下一篇：go WordCount示例__示例程序_MapReduce_大数据计算服务-阿里云