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Re: the different size of file through hadoop streaming - HDFS - [mail # user]
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...I have known why. When an executable is specified for mappers, each mapper task will launch the executable as a separate process when the mapper is initialized. As the mapper task runs...
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Author: 周梦想,
2013-02-01, 06:31
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the different size of file through hadoop streaming - HDFS - [mail # user]
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...hello, I process a file using hadoop streaming. but I found streaming will add byte 0x09 before 0x0a. So the file is changed after streaming process. some one can tells me why add this byte ...
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Author: 周梦想,
2013-02-01, 03:53
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Re: how to start hadoop 1.0.4 backup node? - HDFS - [mail # user]
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...yes, 1.1.x not appear, but document of 1.0.4 is still there. 2012/12/29 Harsh J ...
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Author: 周梦想,
2012-12-29, 07:15
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Re: how to start hadoop 1.0.4 backup node? - HDFS - [mail # user]
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...ok, retported bug as HDFS-4348 . thanks. Andy 2012/12/29 Suresh Srinivas ...
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Author: 周梦想,
2012-12-29, 06:12
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how to start hadoop 1.0.4 backup node? - HDFS - [mail # user]
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...http://hadoop.apache.org/docs/r1.0.4/hdfs_user_guide.html#Backup+Node the document write: The Backup node is configured in the same manner as the Checkpoint node. It is started with bi...
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Author: 周梦想,
2012-12-29, 03:13
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Re: why not hadoop backup name node data to local disk daily or hourly? - HDFS - [mail # user]
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...thanks Tariq, Now we are trying to recover data，but some data has lost forever. the logs just reported NULL Point Exception: 2012-12-17 17:09:05,646 ERROR org.apache.hadoop.hdfs...
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Author: 周梦想,
2012-12-25, 02:22
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Re: why not hadoop backup name node data to local disk daily or hourly? - HDFS - [mail # user]
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...Hi Tariq， Thanks for your patient. I know that fsimage stores metadata of blocks. I have three machine to back it, so I don't worry about it lost. I'm using SNN and NFS to backup NN data fil...
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Author: 周梦想,
2012-12-24, 10:50
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Re: why not hadoop backup name node data to local disk daily or hourly? - HDFS - [mail # user]
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...Thanks to Harsh and Mohammad. Because of data crash, I got ill,so reply late... 2012/12/20 Harsh J Actually the problem was beggining at SecondNameNode. We changed all IPs...
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Author: 周梦想,
2012-12-24, 10:40
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Re: How to troubleshoot OutOfMemoryError - HDFS - [mail # user]
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...I encountered the OOM problem, because i don't set ulimit open files limit. It had nothing to do with Memory. Memory is sufficient. Best Regards, Andy 2012/12/22 Manoj Babu ...
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Author: 周梦想,
2012-12-24, 03:30
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