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RE: what will happen if a backup name node folder becomes unaccessible? - Hadoop - [mail # user]
...Ok...   Now you have me confused. Everything we've seen says that writing to both a local disk and to an NFS  mounted disk would be the best way to prevent a problem.  Now you...
   Author: Michael Segel, 2010-08-23, 19:05
[expand - 1 more] - RE: Best practices - Large Hadoop Cluster - Hadoop - [mail # user]
...Raj...  Ok, one of the things we have at one of my clients is the hadoop user's a ccount is actually a centralized account. (User's accounts are mounted as t hey log in to the machine.)...
   Author: Michael Segel, 2010-08-10, 23:55
[expand - 1 more] - RE: Backing up HDFS - Hadoop - [mail # user]
...    And that would be a waste. (Why build a cloud just to store data and not do  any processing?)  You're not building your cloud in a vacuum. There are going to be SAN(s...
   Author: Michael Segel, 2010-08-03, 15:46
[expand - 1 more] - RE: Fair Scheduler documentation? - Hadoop - [mail # general]
... wer points... the allocations.xml file?  find it. Not sure if its a valid [SNIP]     https://issues.apache.org/jira/browse/MAPREDUCE-698 (Found using Yahoo! as my search...
   Author: Michael Segel, 2010-07-26, 16:13
RE: manipulate counters in new api - Hadoop - [mail # user]
...  ,  add and   This is pretty similar to my post to general-hadoop.  The idea is how to create dynamic counters vs enum counters.  To answer Gang's question ... if y...
   Author: Michael Segel, 2010-07-19, 20:00
Dynamic counters in Hadoop M/R jobs... - Hadoop - [mail # general]
...Hi,  In looking at "The Definitive Guide"  pgs 211-218 looking at the documentat ion for counters have a question about how to use the  dynamic (String, String) methods to cre...
   Author: Michael Segel, 2010-07-19, 18:22
RE: Single Node with multiple mappers? - Hadoop - [mail # user]
... Moritz,  I'm not sure what you're doing, but raising the number of mapers in your  configuration isn't a 'hint'.  The number of mapers that you can run will depend on yo...
   Author: Michael Segel, 2010-07-16, 09:59
RE: Please help! Corrupt fsimage? - Hadoop - [mail # user]
...I know this is a little late in the game...  You could have forced the cluster out of safe mode and then use fsck to cop y the bad blocks out to the file system. (See the help on fsck) ...
   Author: Michael Segel, 2010-07-09, 14:35
RE: How to control the number of map tasks for each nodes? - Hadoop - [mail # user]
...Just a nit.  i7s are quad core. While Intel has 2 'threads' per core. (I'm assuming you' re using the i7's (800 series and below) in a single socket mother board.) Based on experience w...
   Author: Michael Segel, 2010-07-09, 01:35
RE: decommissioning nodes help - Hadoop - [mail # user]
...What happens when you run an fsck?  u cacti ) on these nodes indicating blocks are being moved to compensate fo r the excluded nodes. This is in the past 2 hours since the process was s...
   Author: Michael Segel, 2010-07-09, 00:44
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