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Re: Cannot start DataNode after adding new volume - Hadoop - [mail # user]
...Hi Charles,From log it looks like that DataNode process don't have permissions towrite to "/usr/lib/hadoop" dir. Can you check permissions on "/usr/lib/hadoop" for user under  which Dat...
   Author: Samir Ahmic, 2014-09-16, 12:47
[expand - 1 more] - Re: TableInputFormatBase Cannot resolve the host name - HBase - [mail # user]
...Yes. From IP address to name that is reverse DNS lookup. Yes mapreduce willwork but you will see that error in logs.RegardsOn Jun 25, 2014 11:12 AM, "Li Li"  wrote: ...
   Author: Samir Ahmic, 2014-06-25, 09:23
Re: Timeouts during major compaction - HBase - [mail # user]
...Hi,You are definitely experiencing performance degradation cussed by majorcompaction. How big is your write load ? Maybe you should consider todecrease time interval between major compaction...
   Author: Samir Ahmic, 2014-06-17, 12:53
[expand - 1 more] - Re: Regionserver crash - HBase - [mail # user]
...Here is explanation for WALTrailer from source code:   * A trailer that is appended to the end of a properly closed HLog WALfile.   * If missing, this is either a legacy ...
   Author: Samir Ahmic, 2014-06-17, 12:11
Re: Adding a new column family in existing table - HBase - [mail # user]
...Hi Vimal,Check 'alter' command in hbase shell. Run help 'alter' in hbase shell thereis very good explanation for command usage.Regarding impact alter command will change table schema  o...
   Author: Samir Ahmic, 2014-05-30, 08:12
[expand - 1 more] - Re: 答复: meta server hungs ? - HBase - [mail # user]
...There should be exception in regionserver log on  hadoop77/192.168.1.87:60020 above  this one:*********2014-04-29 15:32:28,364 FATAL [regionserver60020]regionserver.HRegionServer: ...
   Author: Samir Ahmic, 2014-05-05, 11:26
Re: rowcount in a specified timerange - HBase - [mail # user]
...Hi, HansiTake look athttps://github.com/apache/hbase/blob/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/mapreduce/RowCounter.java.You can modified it and and scan.setTimeRange(lon...
   Author: Samir Ahmic, 2014-04-29, 08:33
[expand - 1 more] - Re: Getting all rows from .META. for a specific table. - HBase - [mail # user]
...Hi David,Here is quick bash script that will extract encoded region name.#!/bin/bashtable="$1"echo "scan '.META.', {FILTER=>\"PrefixFilter('$table')\"}" > cmd_filehbase shell < cmd_...
   Author: Samir Ahmic, 2014-04-25, 14:05
[expand - 1 more] - Re: Copying data from one Hbase cluster to Another Hbase cluster - HBase - [mail # user]
...Well that depends on size of your dataset. You can use hadoop -copyToLocalto copy  /hbase directory to local disk or some other storage device thatis mounted on your original cluster. T...
   Author: Samir Ahmic, 2014-02-14, 12:15
Re: WUI - Regionserver shows duplicated entries (IP-name) - HBase - [mail # user]
...Hi Federico,You can restart master that should clean rs list.Regards2014-02-05 18:15 GMT+01:00 Federico Gaule :> Dear all,>> I've introduced a new regionserver to my cluster.> Fi...
   Author: Samir Ahmic, 2014-02-06, 12:49
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