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Re: when Standby Namenode is doing checkpoint, the Active NameNode is slow. - Hadoop - [mail # user]
...I set the "dfs.image.transfer.bandwidthPerSec." to 50M, and the performance is below:  2013-08-14 12:32:33,079 INFO my.EditLogPerformance: totalCount:1342440 speed:1111 2013-08-14 12:32...
   Author: lei liu, 2013-08-14, 06:09
throughput metrics in hadoop-2.0.5 - Hadoop - [mail # user]
...I use hadoop-2.0.5 and config hadoop-metrics2.properties file with below content. *.sink.ganglia.class=org.apache.hadoop.metrics2.sink.ganglia.GangliaSink31 *.sink.ganglia.period=10 *.sink.g...
   Author: lei liu, 2013-08-06, 06:17
Standby NameNode checkpoint exception - Hadoop - [mail # user]
...I use hadoop-2.0.5, and QJM for HA.  When Standby NameNode do checkpoint,there are below exception  in Standby NameNode: 2013-08-01 13:43:07,965 INFO org.apache.hadoop.hdfs.server....
   Author: lei liu, 2013-08-01, 08:43
Many Standby NameNodes for QJM HA - Hadoop - [mail # user]
...I use hadoop-2.0.5 version, and I use QJM for HA.  I want to there are two Standby NameNodes and one Active NameNode in  HDFS cluster,  I think I need to config below content:...
   Author: lei liu, 2013-08-01, 08:31
how to add JournalNodes - Hadoop - [mail # user]
...I use QJM for HA in hadoop2.0,  now  there are three JournalNodes in HDFS cluster, I want to add two new JournalNodes to HDFS cluster, how to do it? Do I need to restart HDFS clust...
   Author: lei liu, 2013-07-12, 07:27
Re: DFSOutputStream.sync() method latency time - Hadoop - [mail # user]
...The sync method include below code:   // Flush only if we haven't already flushed till this offset.           if (lastFlushOffset != bytesCurBlock) {   &nb...
   Author: lei liu, 2013-03-29, 06:04
AvatarNode configuration - Hadoop - [mail # user]
...I use facebook AvatarNode, my configuration is below:     dfs.name.dir.shared0   /data6/hdfs_ha1/ha_share1/share0/namenode     dfs.name.edits.dir.shared0   /dat...
   Author: lei liu, 2012-10-24, 03:56
[expand - 1 more] - Re: can one map instance handle many data of input paths at the same time - Hadoop - [mail # general]
...Thanks everyone,  I detailed describe my question.  There are two input direcoties:/user/test1/ and /user/test2/ path, I want to join the two direcoties content, in order to join t...
   Author: lei liu, 2011-01-21, 05:57
use counter to statistics file row number - Hadoop - [mail # general]
...I use counter to statistics  file row number in Mapper, example below code:  public void map(LongWritable key, Text value,             OutputCollector...
   Author: lei liu, 2011-01-20, 02:38
how to know which partition data the reduce receive - Hadoop - [mail # general]
...There is job that has three reduce tasks that is the map output data are divided into three partition,  how can I know every reduce receive which partition ?...
   Author: lei liu, 2011-01-18, 03:04
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