小编Aar*_*n S的帖子

我正在尝试使用以下指南在伪分布式配置中设置Hadoop版本0.20.203.0:

http://www.javacodegeeks.com/2012/01/hadoop-modes-explained-standalone.html

运行start-all.sh脚本后,我运行"jps".

我得到这个输出:

4825 NameNode
5391 TaskTracker
5242 JobTracker
5477 Jps
5140 SecondaryNameNode

当我尝试使用以下方法向hdfs添加信息时:

bin/hadoop fs -put conf input

我收到一个错误:

hadoop@m1a2:~/software/hadoop$ bin/hadoop fs -put conf input
12/04/10 18:15:31 WARN hdfs.DFSClient: DataStreamer Exception: org.apache.hadoop.ipc.RemoteException: java.io.IOException: File /user/hadoop/input/core-site.xml could only be replicated to 0 nodes, instead of 1
        at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1417)
        at org.apache.hadoop.hdfs.server.namenode.NameNode.addBlock(NameNode.java:596)
        at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:616)
        at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:523)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1383)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1379)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:416)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1059)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1377)

        at org.apache.hadoop.ipc.Client.call(Client.java:1030)
        at …

我目前正在尝试使用 pywin32 库将大量数据写入 Excel 电子表格。作为我面临的问题的一个简单示例，请使用以下代码生成 1000 个单元格 x 1000 个单元格的乘法表。

import win32com.client
from win32com.client import constants as c

xl = win32com.client.gencache.EnsureDispatch("Excel.Application")                             
xl.Visible = True
Workbook = xl.Workbooks.Add()
Sheets = Workbook.Sheets

tableSize = 1000

for i in range(tableSize):
    for j in range(tableSize):
        Sheets(1).Cells(i+1, j+1).Value = i*j

对于小值，这有效。但是，对于较大的值，python 程序最终会因错误而崩溃：

Traceback (most recent call last):
  File ".\Example.py", line 16, in <module>
    Sheets(1).Cells(i+1, j+1).Value = i*j
  File "C:\PYTHON27\lib\site-packages\win32com\client\__init__.py", line 474, in __setattr__
    self._oleobj_.Invoke(*(args + (value,) + defArgs)) pywintypes.com_error: (-2147352567, 'Exception occurred.', (0, None, None, …

我正在尝试使用python编辑povray文件中的单行.

该文件如下所示:

camera {
 angle 38
 location <500,0,0>
 right x*image_width/image_height
 look_at <0,0,0>
 rotate <0,0,0>
}

我想编辑文件中描述的变量,所以它出现如下:

camera {
 angle 38
 location <1000,1000,1000>
 right x*image_width/image_height
 look_at <10,10,10>
 rotate <30,30,30>
}

为此,我使用以下方法:

def updateCamera(self, filename):
        tmp = "povrayContent/temp.pov"
        lines = open(filename, 'r')
        out = open(tmp , 'w')
        for line in lines:
            if " angle" in line:
                out.write(" angle "+str(int(self.camAngle))+"\n")
            elif " location" in line:
                out.write(" location <"+str(int(self.camera[0]))+","+str(int(self.camera[1]))+","+str(int(self.camera[2]))+">\n")
            elif " look_at" in line:
                out.write(" look_at <"+str(int(self.camera[3]))+","+str(int(self.camera[4]))+","+str(int(self.camera[5]))+">\n")
            elif "rotate" in line:
                out.write(" rotate <"+str(int(self.camera[6]))+","+str(int(self.camera[7]))+","+str(int(self.camera[8]))+">\n") …