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Re: persistent under-replicated blocks - HDFS - [mail # dev]
...Hm, I had hoped this would have been fixed in hdfs 2.  I have a script that I run several times per day that identifies under replicated blocks and increases the replication factor by 1...
2 emails [+ more]    Author: Chris Embree, 2014-01-09, 05:05
Re: Hadoop vs Ceph and GlusterFS - HDFS - [mail # user]
...Ceph and glusterfs are NOT centralized files systems.  Glusterfs can be used with Hadoop map reduce, but it requires a special plug in, and hdfs 2 can be ha, so it's probably not worth ...
   Author: Chris Embree, 2014-01-01, 01:30
Re: Measuring bandwidth in 2.1.x - HDFS - [mail # dev]
...vnstat should be able to do this.  It has a "live" mode or can generate  hourly reports much like sar.  Google for vnstat to find it.  On 9/13/13, hilfi alkaff  wrot...
   Author: Chris Embree, 2013-09-13, 17:26
Re: How to speed up Hadoop? - HDFS - [mail # user]
...I think you just went backwards.   more replicas (generally speaking) are better.  I'd take 60 cheap, 1 U servers over 20 "highly fault tolerant" ones for almost every problem. &nb...
   Author: Chris Embree, 2013-09-06, 00:51
Re: Suspecting Namenode Filesystem Corrupt!! - HDFS - [mail # user]
...My foundation is more Linux than Hadoop, so I'll support Harsh (like he needs it) in asking, "What's the problem?"  If you can't df -h this is probably a "lower than Hadoop" issue, and ...
   Author: Chris Embree, 2013-07-30, 03:27
Re: Why Hadoop force using DNS? - HDFS - [mail # user]
...Just for clarity,  DNS as a service is NOT Required.  Name resolution is.  I use /etc/hosts files to identify all nodes in my clusters.  One of the reasons for using Name...
   Author: Chris Embree, 2013-07-29, 14:45
Re: Can I move block data directly? - HDFS - [mail # dev]
...I know nothing.  It seems that circumventing normal operations could be very bad.  There was an example of something similar at hadoop summit.  Some very experienced contribut...
   Author: Chris Embree, 2013-07-09, 01:30
Re: Reg:HDFS Decommission Design Document. - HDFS - [mail # user]
...Ha -- I just decommissioned some nodes today.  Add the nodes you'd like to decom. to the excludes file (search for it's name in hdfs-site.xml), usually dfs.exclude.  Login to your ...
   Author: Chris Embree, 2013-06-13, 23:46
Re: recovery accidently deleted pig script - HDFS - [mail # user]
...This is not a Hadoop question (IMHO).  2 words:  Version Control  Did the advent of Hadoop somehow circumvent all IT convention?  Sorry folks, it's been a rough day. &nbs...
   Author: Chris Embree, 2013-06-13, 02:35
Re: is time sync required among all nodes? - HDFS - [mail # user]
...Yes, NTPD is your best option.  On 6/4/13, Ben Kim  wrote:...
   Author: Chris Embree, 2013-06-05, 03:11
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