TaskLogAppender.flush()中的NullPointerException问题

[Liqi Gao]

Hi,
有人遇到这种java.lang.NullPointerException异常吗：
--------------------------------------------
15-03-2014 20:02:26,187 WARN [main] mapred.Child - Error running child
java.lang.NullPointerException
at org.apache.hadoop.mapred.TaskLogAppender.flush(TaskLogAppender.java:67)
at org.apache.hadoop.mapred.TaskLog.syncLogs(TaskLog.java:341)
at org.apache.hadoop.mapred.Child$4.run(Child.java:257)
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:1093)
at org.apache.hadoop.mapred.Child.main(Child.java:249)
15-03-2014 20:02:26,198 INFO [main] mapred.Task - Runnning cleanup for the task
--------------------------------------------

感觉与log4j有关。在Hadoop任务的jar里面有log.property文件，配置内容:
--------------------------------------------
log4j.rootLogger=INFO, console
log4j.appender.console=org.apache.log4j.ConsoleAppender
log4j.appender.console.layout=org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=%d{dd-MM-yyyy
HH:mm:ss,SSS} %-5p [%t] %c{2} - %m%n
--------------------------------------------
不过不管有没有这个文件，都会出这个异常。

运行环境是Linux，提交任务环境是Windows+cygwin。Hadoop版本是1.0.2。


高立琦

[Huang Yifei]

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