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Re: issue about distcp " Source and target differ in block-size. Use -pb to preserve block-sizes during copy." - Hadoop - [mail # user]
...Your client side was running at "14/07/24 18:35:58 INFO mapreduce.Job:T***", But you are pasting NN log at "2014-07-24 17:39:34,255";By the way, which version of HDFS are you using?Regards,*...
   Author: Stanley Shi, 2014-07-25, 08:09
Re: issue about run MR job use system user - Hadoop - [mail # user]
...The "alex" should belongs to "hadoop" group on namenode;Regards,*Stanley Shi,*On Thu, Jul 24, 2014 at 10:11 PM, java8964  wrote: ...
   Author: Stanley Shi, 2014-07-25, 02:28
Re: how to reduce delay in HDFS restart - Hadoop - [mail # user]
...Do you have a secondary namenode running? Secondary NN is used for thispurpose;Also, if you have HDFS HA enabled, this problem will also not occur.Regards,*Stanley Shi,*On Tue, Jul 22, 2014 ...
   Author: Stanley Shi, 2014-07-24, 05:58
Re: Decommissioning a data node and problems bringing it back online - Hadoop - [mail # user]
...which distribution are you using?Regards,*Stanley Shi,*On Thu, Jul 24, 2014 at 4:38 AM, andrew touchet  wrote: ...
   Author: Stanley Shi, 2014-07-24, 05:54
Re: Managed File Transfer - Hadoop - [mail # user]
...There's a DistCP utility for this kind of purpose;Also there's "Spring XD" there, but I am not sure if you want to use it.Regards,*Stanley Shi,*On Mon, Jul 7, 2014 at 10:02 PM, Mohan Radhakr...
   Author: Stanley Shi, 2014-07-09, 08:40
Re: How do I recover the namenode? - Hadoop - [mail # user]
...This is not recommended.You only backup the fsimage file, the data blocks, which are stored indatanode, are not stored.The chances may be if you removed some file after your fsimage backup,t...
   Author: Stanley Shi, 2014-07-09, 08:25
Re: Huge text file for Hadoop Mapreduce - Hadoop - [mail # user]
...You can get the wikipedia data from it's website, it's pretty big;Regards,*Stanley Shi,*On Tue, Jul 8, 2014 at 1:35 PM, Du Lam  wrote: ...
   Author: Stanley Shi, 2014-07-09, 08:16
Re: How to recover reducer task data on a different data node? - Hadoop - [mail # user]
...It will start from scratch to copy all map outputs from all mapper nodes;Regards,*Stanley Shi,*On Thu, Jul 3, 2014 at 2:28 PM, James Teng  wrote: ...
   Author: Stanley Shi, 2014-07-03, 08:53
Re: grouping similar items toegther - Hadoop - [mail # user]
...The "similar" logic is not transitive, that means, if a is similar to b, bis similar to c, but a may be not similar to c;then how do you do the group?Regards,*Stanley Shi,*On Sat, Jun 21, 20...
   Author: Stanley Shi, 2014-06-24, 06:17
Re: How to upgrade Hadoop 2.2 to 2.4 - Hadoop - [mail # user]
...Cluster-running upgrade is only supported after 2.4, that is, upgrade from2.4 to 2.4+ is supported; upgrading from 2.2 to 2.4 is not supported;Regards,*Stanley Shi,*On Fri, Jun 20, 2014 at 5...
   Author: Stanley Shi, 2014-06-24, 06:04
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