DataNode after recovering from failure
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About “DataNode after recovering from failure” questions
After recovering from the failure does the DataNode has the data prior to failure or is there any change in the content of data in the DataNode?
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I am running Map/Reduce tasks with hadoop 1.2.1.
While running heavy MR tasks, I encountered data node failure. The log messages follows:
2017-01-24 21:55:41,735 ERROR org.apache.hadoop.hdfs.server.
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As I know the procedure for block and replica storing in Hadoop is conducted by the BlockPlacementPolicy function or process, but this is for the initial storing procedure (first time when the data...
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One of the disk from my hadoop cluster datanode has become read only. I am not sure what caused this problem.
Will removing this volume from the datanode cause data lose ??
How to handle this if ...
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I have been running a Hadoop 2.3.0 cluster and I have been noticing on the status page (:50070/dfshealth.html) shows data nodes that have died which happens every couple of days. After noticing a
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Situation:
In my test apache hadoop, I run a MapReduce job.
If one of my datanode was down (I trun off the machine), and this datanode is working with my MapReduce job.
My thinking:
I
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I installed hadoop-2.2.0 version on vmware and when it starts, it shows all the processes working, but after some time datanode gets killed. So, I checked the logs and I found this:
2014-01-21 04:...
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I have added the new disk to the hortonworks sandbox on the OracleVM, following this example:
https://muffinresearch.co.uk/adding-more-disk-space-to-a-linux-virtual-machine/
I set the owner of the
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I was trying to install Hadoop on windows.
Namenode is working fine but Data Node is not working fine. Following error is being displayed again and again even after trying for several times.
Follow...
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I have given permission to /app/hadoop/tmp/dfs/data.
WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Invalid dfs.datanode.data.dir /app/hadoop/tmp/dfs/data :
EPERM: Operation not permitted
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