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[expand - 1 more] - Re: data loss after cluster wide power loss - HDFS - [mail # dev]
...Thanks.  Suresh and Kihwal are right-- renames are journalled, but not necessarily durable (stored to disk).  I was getting mixed up with HDFS semantics, in which we actually do ma...
   Author: Colin McCabe, 2013-07-09, 01:53
[expand - 1 more] - Re: dfs.datanode.socket.reuse.keepalive - HDFS - [mail # dev]
...Thanks for reminding me.  I filed https://issues.apache.org/jira/browse/HDFS-4911 for this.  4307 was about making the cache robust against programs that change the wall-clock time...
   Author: Colin McCabe, 2013-06-17, 18:09
Re: Why is FileSystem.createNonRecursive deprecated? - HDFS - [mail # dev]
...This seems inconsistent. If the method is deprecated just because it's in org.apache.hadoop.FileSystem, shouldn't all FileSystem methods be marked as deprecated?  On the other hand, a u...
   Author: Colin McCabe, 2013-06-13, 00:58
Re: [jira] [Created] (HDFS-4824) FileInputStreamCache.close leaves dangling reference to FileInputStreamCache.cacheCleaner - HDFS - [mail # dev]
...Hi Shouvanik,  Why not try asking the Talend community?  Also, this question belongs on the user list.  thanks, Colin   On Wed, May 15, 2013 at 4:20 AM, Shouvanik Haldar ...
   Author: Colin McCabe, 2013-05-15, 23:47
Re: Is Hadoop SequenceFile binary safe? - HDFS - [mail # dev]
...It seems like we could just set up an escape sequence and make it actually binary-safe, rather than just probabilistically.  The escape sequence would only be inserted when there would ...
   Author: Colin McCabe, 2013-05-02, 18:29
[expand - 11 more] - Re: VOTE: HDFS-347 merge - HDFS - [mail # dev]
...Hi Azuryy,  The branch adds new APT documentation which describes the new configuration that is needed. It's in ./hadoop-hdfs-project/hadoop-hdfs/src/site/apt/ShortCircuitLocalReads.apt...
   Author: Colin McCabe, 2013-04-12, 20:06
Re: testHDFSConf.xml - HDFS - [mail # dev]
...On Wed, Apr 10, 2013 at 10:16 AM, Jay Vyas  wrote:  "supergroup" is the default supergroup in HDFS.  Check DFSConfigKeys.java:    public static final String  DF...
   Author: Colin McCabe, 2013-04-10, 17:43
Re: Heartbeat interval and timeout: why 3 secs and 10 min? - HDFS - [mail # dev]
...My understanding is that the 10 minute timeout helps to avoid replication storms, especially during startup.  You might be interested in HDFS-3703, which adds a "stale" state which data...
   Author: Colin McCabe, 2013-03-13, 18:08
Re: How to remove three disks from three different nodes in a ten node cluster in less than an hour without losing replicas? - HDFS - [mail # user]
...It sounds like what you would like is a way to decommission just one storage directory on the DataNode. We don't currently support that.  You might be able to get something approaching ...
   Author: Colin McCabe, 2013-02-04, 22:53
Re: JournalNode desynchronized - HDFS - [mail # user]
...You can rsync from one of your other JournalNodes into the correct directory on the new one. You can safely do this while the old one is running.  In the future, there will be a way to ...
   Author: Colin McCabe, 2013-02-04, 22:49
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB