Hi,
here is the hbase-site.xml file.
<property>
<name>hbase.hregion.majorcompaction</name>
<value>0</value>
</property>
<property>
<name>hbase.regionserver.codecs</name>
<value>snappy,gz</value>
</property>
<property>
<name>hbase.rootdir</name>
<value>hdfs://master:9000/hbase</value>
</property>
<property>
<name>hbase.zookeeper.quorum</name>
<value>master,slave,serverslave</value>
</property>
<property>
<name>hbase.cluster.distributed</name>
<value>true</value>
</property>
<property>
<name>dfs.support.append</name>
<value>true</value>
</property>
<property>
<name>hbase.hregion.memstore.mslab.enabled</name>
<value>true</value>
</property>
<property>
<name>hbase.regionserver.handler.count</name>
<value>40</value>
</property>
<property>
<name>hbase.regionserver.global.memstore.upperLimit</name>
<value>0.45</value>
</property>
<property>
<name>hbase.regionserver.global.memstore.lowerLimit</name>
<value>0.4</value>
</property>
<property>
<name>hfile.block.cache.size</name>
<value>0.3</value>
</property>
<property>
<name>mapred.map.tasks.speculative.execution</name>
<value>false</value>
</property>
<property>
<name>mapred.reduce.tasks.speculative.execution</name>
<value>false</value>
</property>
<!-- default is 256MB 268435456, this is 1.5GB -->
<property>
<name>hbase.hregion.max.filesize</name>
<value>161061273600</value>
</property>
<!-- default is 2 -->
<property>
<name>hbase.hregion.memstore.block.multiplier</name>
<value>4</value>
</property>
<!-- default is 64MB 67108864 -->
<property>
<name>hbase.hregion.memstore.flush.size</name>
<value>134217728</value>
</property>
<!-- default is 7, should be at least 2x compactionThreshold -->
<property>
<name>hbase.hstore.blockingStoreFiles</name>
<value>200</value>
</property>
<property>
<name>hbase.regionserver.lease.period</name>
<value>1800000</value> <!-- 30 minutes -->
</property>
<property>
<name>hbase.rpc.timeout</name>
<value>1800000</value> <!-- 30 minutes -->
</property>
Thanks.
Alex.
-----Original Message-----
From: Marcos Ortiz <mlortiz@uci.cu>
To: alxsss <alxsss@aim.com>
Cc: user <user@hbase.apache.org>
Sent: Fri, Feb 8, 2013 11:52 am
Subject: Re: split table data into two or more tables
On 02/08/2013 01:59 PM, alxsss@aim.com wrote:
Hi,
The rationale is that I have a mapred job that adds new records to an hbase table, constantly.
The next mapred job selects these new records, but it must iterate over all records and check
if it is a candidate for selection.
Since there are too many old records iterating though them in a cluster of 2 nodes +1 master
takes about 2 days. So I thought, splitting them into two tables must reduce this time, and
as soon as I figure out that there is no more new record left in one of the new tables I will
not run mapred job on it.
This use-case is very common and a good practice here is to pre-split the regions to
control exactly where to put your data and the size of it, keeping
always the numbers of regions more manageable.
Currently, we have 7 regions including ROOT and META.
Can you share your conf/hbase-site.xml ?
Thanks.
Alex.
-----Original Message-----
From: Ted Yu <yuzhihong@gmail.com>
To: user <user@hbase.apache.org>
Sent: Fri, Feb 8, 2013 10:40 am
Subject: Re: split table data into two or more tables
May I ask the rationale behind this ?
Were you aiming for higher write throughput ?
Please also tell us how many regions you have in the current table.
Thanks
BTW please consider upgrading to 0.94.4
On Fri, Feb 8, 2013 at 10:36 AM, <alxsss@aim.com> wrote:
Hello,
I wondered if there is a way of splitting data from one table into two or
more tables in hbase with iidentical schemas, i.e. if table A has 100M
records put 50M into table B, 50M into table C and delete table A.
Currently, I use hbase-0.92.1 and hadoop-1.4.0
Thanks.
Alex.
--
Marcos Ortiz Valmaseda,
Product Manager && Data Scientist at UCI
Blog: http://marcosluis2186.posterous.com
Twitter: @marcosluis2186
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