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fast scan VS hot regions By: Andre Reiter i'm starting a new project, which is pretty simple it will be
something like google analytics, but of course a bit smaller what is
required: web servers handle requests with a kind of generic key/value
list that requests will come at a pretty much…
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0 | May 25 2012 04:14 |
May 25 2012 04:14 |
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Manager Zookeeper Client Connections By: Narendra yadala I have a client which connects to Zookeeper (which runs as part of
HBase installation) from my web application running on top of Tomcat
Servlet Container. Now whenever I restart my Tomcat the zookeeper
client connections are left open or something…
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7 | May 11 2012 08:24 |
May 25 2012 01:45 |
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A question about HBase MapReduce By: Florin P Hello! I've read Lars George's blog
http://www.larsgeorge.com/2009/05/hbase-mapreduce-101-part-i.html
where at the end of the article, he mentioned "In the next post I will
show you how to import data from a raw data file into a HBase table
and…
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0 | May 25 2012 01:35 |
May 25 2012 01:35 |
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Version issue By: Prashant Kommireddi Hi All, Running into this issue after updating hbase. How can I fix
it? Exception in thread "main" java.lang.RuntimeException:
hbase-default.xml file seems to be for and old version of HBase
(@@@VER### @@@), this version is 0.95-SNAPSHOT at…
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2 | May 25 2012 01:02 |
May 25 2012 01:32 |
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Disable timestamp in HBase Table a.k.a Disable Versioning in HBase Table By: anil gupta Hi All, We are planning to store data in HBase. Currently, in one of
our use case once a row is written into HBase Table we wont be
modifying the data of that row. Since, for every cell(right?) in HBase
a timestamp(long value) is stored; this…
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3 | May 24 2012 16:52 |
May 25 2012 01:23 |
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Restrictions during compactions By: Takahiko Kawasaki Hello, I'm a newbie and wondering whether or not there is any
restriction during HBase minor/major compactions. I read the online
document but could not find any explicit mention about restrictions.
What I'm mostly worrying about is whether…
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2 | May 23 2012 08:15 |
May 25 2012 00:18 |
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Append and Put By: NNever Simple question, what's the difference between "Append" and "Put"?
It seems they both can put some datas into a row. Dose "Append" keep
several write operations in atom but Put not? if it is, then is
"Append" is going to take place of Put? may…
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4 | May 22 2012 22:52 |
May 24 2012 22:40 |
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Re:: question on filters By: Dhaval Shah Jack, you can use filters on Get's too..
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0 | May 24 2012 19:41 |
May 24 2012 19:41 |
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question on filters By: jack chrispoo Hi, I'm new to HBase and I have a question about using filters. I
know that I can use filters with scan, say scan start-key=key1 &
end-key=key2 and with a SingleColumnValueFilter: columnA=valueA. But
in my java program I need to do filtering…
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0 | May 24 2012 19:07 |
May 24 2012 19:07 |
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Occasional regionserver crashes following socket errors writing to HDFS By: Eran Kutner Hi, We're seeing occasional regionserver crashes during heavy write
operations to Hbase (at the reduce phase of large M/R jobs). I have
increased the file descriptors, HDFS xceivers, HDFS threads to the
recommended settings and actually way above. …
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25 | May 10 2012 03:18 |
May 24 2012 18:40 |
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Re: Efficient way to read a large number of files in S3 and upload their content to HBase By: Amandeep Khurana Marcos Can you elaborate on your use case a little bit? What is the
nature of data in S3 and why you want to use HBase? Why do you want to
combine HFiles and upload back to S3? It'll help us answer your
questions better. Amandeep On May 24,…
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5 | May 24 2012 14:22 |
May 24 2012 17:34 |
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HappyBase 0.3, a developer-friendly Python library to interact with HBase By: Wouter Bolsterlee Hi all, I have just released HappyBase 0.3. Among some other
changes, this release fixes scanner compatibility problems with HBase
0.90.x (included in CDH3). Release notes:
http://happybase.readthedocs.org/en/latest/news.html#happybase-0-3 …
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0 | May 24 2012 17:25 |
May 24 2012 17:25 |
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HBase logging only prints ulimit information By: Kevin Hi, My distributed cluster has been running for a couple of months,
and I just noticed that HBase has stopping rolling log files. The last
log file before the most current one (hbase-hbase-*.log) is dated
April, 25 (hbase-hbase-*.log.2012-04-25).…
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3 | May 24 2012 13:33 |
May 24 2012 16:02 |
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Efficient way to read a large number of files in S3 and upload their content to HBase By: Marcos Ortiz Regards to all the list. We are using Amazon S3 to store millions of
files with certain format, and we want to read the content of these
files and then upload its content to a HBase cluster. Anyone has done
this? Can you recommend me a efficient…
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2 | May 24 2012 13:53 |
May 24 2012 14:20 |
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Yet Another LeaseException :-( By: Igal Shilman Hi, We've noticed in our production cluster (0.90.4-cdh3u3) that
from time to time some of our map tasks fail due to a LeaseException
thrown while scanning. We have "hbase.regionserver.lease.period", and
"hbase.rpc.timeout" both set to 5 minutes.…
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5 | May 21 2012 09:35 |
May 24 2012 13:38 |
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Announcing HappyBase, a developer-friendly Python library to interact with HBase By: Wouter Bolsterlee Hi all, I'm happy to announce HappyBase, a developer-friendly Python
library to interact with Apache HBase. HappyBase is designed for for
use in standard HBase setups, and offers application developers a
Pythonic API to interact with HBase. …
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12 | May 20 2012 20:29 |
May 24 2012 10:38 |
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Region split with one row? By: Ben Kim What happens when a region has columns of more than 10GB in one row?
Default max hfile size 10GB, and if the data exceeds 10GB then a
region split happens. But since one row takes up more than 10GB, I'm
wondering how region split happens? Does…
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1 | May 24 2012 09:49 |
May 24 2012 10:19 |
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Problem doing bulk load programmatically By: sakin cali Hi, I am trying generate an HFile and load it to hbase
programmatically. (importtsv does not fit my requirements) I have
modified TestLoadIncrementalHFiles class and try to load an example
hfile. But I get errors at the last step
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8 | May 24 2012 01:12 |
May 24 2012 10:15 |
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Pagination in hbase By: vishnupriyaa Hi, In my hbase table I have around 10000 data ,need to fetch
first 100 then next 100 row like that.How can I run a java code to
fetch like that, by setting limit and offset.
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5 | May 24 2012 07:51 |
May 24 2012 08:18 |
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auto-added RegionServers By: Norbert Burger We had a situation earlier today in our PROD cluster where a test
machine was accidentally configured with our PROD cluster config. On
startup, the HMaster promptly accepted the RS into the fold, and
started re-assigning regions to it. The mass…
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2 | May 23 2012 22:31 |
May 24 2012 00:08 |