在PIG UDF中调试 [英] Debugging in PIG UDF
问题描述
我是Hadoop / PIG的新手。
我有一个基本问题。
I am new to Hadoop/PIG. I have a basic question.
我们在PIG UDF中有日志工具吗?我写了一个UDF,我需要验证
我需要记录某些语句来检查流。是否有可用的日志记录工具?如果是,猪日志在哪里?
Do we have a Logging facility in PIG UDF? I have written a UDF which I need to verify I need to log certain statements to check the flow. Is there a Logging facility available? If yes where are the Pig logs present?
推荐答案
假设您的UDF扩展 EvalFunc
,可以使用从返回的记录器 EvalFunc.getLogger()
。日志输出应该在执行相关的Map / Reduce任务中可见(如果作业在多个阶段中执行,那么您必须通过它们来找到关联的日志条目)。
Assuming your UDF extends EvalFunc
, you can use the Logger returned from EvalFunc.getLogger()
. The log output should be visible in the associated Map / Reduce task that pig executes (if the job executes in more than a single stage then you'll have to pick through them to find the associated log entries).
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