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132 discussions - 655 posts

  • Hi I know HBase is designed for OLAP, query intensive type of applications. But I like the flexibility feature of its column-base architecture which allows me having no need to predefine every column ...
    Jan 9, 2012 at 5:26 pm
    Jan 13, 2012 at 6:43 pm
  • Dear all, I am developing an API for medical use i.e Hospital admissions and all about patients, thus transactions and queries and realtime data is important here... Therefore both real-time and ...
    Dalia SobhyDalia Sobhy
    Jan 25, 2012 at 3:02 pm
    Jan 27, 2012 at 7:06 am
  • Still no love... Any suggestions? I'm on EC2, and I am trying to set up a Pseudo-Distributed HBaser Server on one machine, and access it from another. Both machines are EC2. I have already found the ...
    Peter WolfPeter Wolf
    Jan 12, 2012 at 4:20 pm
    Jan 16, 2012 at 5:50 pm
  • I can't start HMaster Please help me.. second day about this error Exception in thread "main" java.lang.RuntimeException: Failed construction of Regionserver: class ...
    Jan 21, 2012 at 6:04 am
    May 4, 2012 at 4:40 pm
  • Hello, I read this blog http://outerthought.org/blog/465-ot.html. It mentions that every 24 hours the major compaction will occur. My question is that if there are any other conditions which can ...
    Jan 26, 2012 at 1:44 pm
    Jan 27, 2012 at 6:26 am
  • Hallo, I tried the pseudo distribution mode of HBase. The Hadoop version is 0.20.2. I configured the hbase-site.xml as <configuration <property <name hbase.rootdir</name <value ...
    Jan 5, 2012 at 3:08 pm
    Jan 6, 2012 at 5:00 pm
  • Hi all, Hadoop 1.0.0 and HBase 0.90.5 are released. I am curious whether hadoop 1.0.0 is compatible with HBase 0.90.5. And whether this combination is the best choice for production cluster now? ...
    Weihua JIANGWeihua JIANG
    Jan 5, 2012 at 6:07 am
    Feb 17, 2012 at 10:13 pm
  • Hello all, I am looking for advice on speeding up my Scanning. I want to iterate over all rows where a particular column (language) equals a particular value ("JA"). I am already creating my row keys ...
    Peter WolfPeter Wolf
    Jan 25, 2012 at 12:56 pm
    Jan 26, 2012 at 6:09 pm
  • Hi, 1) According to the this url (1), HBase performs well for two or three column families. Why is it so? 2) Dump of a HFile, looks like below. The contents of a row stay together like a regular ...
    Praveen SripatiPraveen Sripati
    Jan 21, 2012 at 7:08 am
    Jan 24, 2012 at 9:31 am
  • this is probably a rookie question. but my understanding is that if i increase the region max file size and then initiate major compaction manually, the number of regions should ideally go down by ...
    T Vinod GuptaT Vinod Gupta
    Jan 12, 2012 at 6:36 pm
    Mar 28, 2012 at 5:02 pm
  • How can I insert images into Hbase? Is it possible to use HBase to serve images? For example: A user uploads an image to Hbase via our PHP application (REST/Stargate interface). Also, what is the ...
    Jan 17, 2012 at 4:54 pm
    Jan 18, 2012 at 10:25 pm
  • Your HBase crew are pleased to announce the release of HBase 0.92.0. Download it from your favorite Apache mirror [1]. HBase 0.92.0 includes a wagon-load of new features including coprocessors, ...
    Jan 23, 2012 at 11:57 pm
    Feb 2, 2012 at 8:40 pm
  • Hi, I wanted to setup Hadoop and Hbase in one remote server and Hbase client running in another system. Please let me know which mode should the Hadoop and Hbase be running in the remote server. ...
    Sangeetha kSangeetha k
    Jan 24, 2012 at 11:52 am
    Jan 30, 2012 at 11:27 am
  • Hi, I have an HBase cluster which consists of 1 master server (running NameNode, Zoo Keeper and HBase Master) and 3 region masters (Running DataNode and Region Server). I also have a Thrift server ...
    Galed FriedmannGaled Friedmann
    Jan 30, 2012 at 2:39 pm
    Feb 2, 2012 at 7:27 pm
  • Hello guys, I setup a Hadoop and HBase in EC2. My Settings as follows: Apache Official Version Hadoop HBase 0.90.4 1 master node for Hadoop and HBase , 1 tasktracker/regionserver for ...
    Fei DongFei Dong
    Jan 24, 2012 at 1:33 am
    Jan 25, 2012 at 4:57 am
  • Royston: For the median aggregate, is the following what you're looking for ? Find the median among the values of all the keyvalue for cf:qualifier column. There is a well known distributed method of ...
    Ted YuTed Yu
    Jan 6, 2012 at 3:31 am
    Jan 10, 2012 at 1:47 pm
  • Hi all, I am trying to create hbase tables using shell script. The table name will come as argument to the script like: $HBASE_HOME/bin/hbase shell created.sh test1 Here test1 is the table name. When ...
    Stuti AwasthiStuti Awasthi
    Jan 25, 2012 at 7:35 am
    Feb 2, 2012 at 10:47 am
  • Hello, Have couple of questions around hbase "export" facility: 1. I was looking at Export code. http://hbase.apache.org/apidocs/org/apache/hadoop/hbase/mapreduce/Export.html. I don't see ...
    Jahangir MohammedJahangir Mohammed
    Jan 12, 2012 at 4:14 am
    Jan 25, 2012 at 4:42 am
  • I have a standalone instance of HBASE (single instance, on localhost). After reading a few thousand records using a scanner my thread is stuck waiting: "main" prio=10 tid=0x00000000016d4800 nid=0xf3a ...
    Joel HalbertJoel Halbert
    Jan 13, 2012 at 10:37 pm
    Jan 19, 2012 at 5:01 am
  • Hello all, I am having trouble starting and stopping Standalone HBase. I successfully start Standalone, or at least there is no error message However, when I try to use the shell, I get this ...
    Peter WolfPeter Wolf
    Jan 10, 2012 at 5:04 pm
    Jan 10, 2012 at 7:52 pm
  • I am badly stuck and can't find a way out. i want to change my rowkey schema while copying data from 1 table to another. but a map reduce job to do this won't work because of large row sizes ...
    T Vinod GuptaT Vinod Gupta
    Jan 12, 2012 at 11:38 am
    Nov 15, 2013 at 9:05 pm
  • Trying to run my code (a test of Aggregation Protocol and an MR HBase table loader) on latest build of 0.92.0 (r1232715) I get an 'old server' warning (I've seen this before and it's always been ...
    Royston SellmanRoyston Sellman
    Jan 20, 2012 at 5:25 pm
    Jan 23, 2012 at 1:56 pm
  • Another Standalone question- Can I have multiple clients, running on multiple machines access a Standalone HBase? Is there a problem with having 10's of clients hitting a Standalone system? What is ...
    Peter WolfPeter Wolf
    Jan 10, 2012 at 5:42 pm
    Jan 10, 2012 at 6:55 pm
  • Hi, I am new to hadoop and hbase. I was able to configure a pseudo-distributed hbase instance using HDFS file system. I can interact to my hbase instance using hbase shell with no problem. But I'm ...
    Listas DiscussõesListas Discussões
    Jan 27, 2012 at 6:19 pm
    Jun 3, 2014 at 3:38 am
  • Hi, I am using hbase to store java objects. The objects implement the Writable interface. The size of objects to be stored in each row ranges from a few kb to ~50 Mb. The strategy that I am planning ...
    Rohit KelkarRohit Kelkar
    Jan 27, 2012 at 8:43 am
    Jan 30, 2012 at 8:20 am
  • Hi, Coprocessors introduced in 0.92 can also be used to filter out the data similar to the filters. What are the differences between filters and coprocessors leaving aside the code/API? One thing I ...
    Praveen SripatiPraveen Sripati
    Jan 26, 2012 at 6:25 am
    Jan 30, 2012 at 2:37 am
  • Hello list, I am trying to connect to Hbase from a remote machine, but I am getting the following error - debug: Hbase Demo Application 12/01/22 19:48:19 INFO zookeeper.ZooKeeper: Client ...
    Mohammad TariqMohammad Tariq
    Jan 22, 2012 at 2:27 pm
    Jan 23, 2012 at 7:02 am
  • Hi , I am looking into how to limit the output of scans. I got this in shell but not able to get any java api for that. I am sure I am missing it. scan 't1',{LIMIT= 2} Please suggest me the scan api ...
    Stuti AwasthiStuti Awasthi
    Jan 20, 2012 at 5:24 am
    Jan 23, 2012 at 6:16 am
  • I'm taking a look at moving our datastore from Oracle to HBase, and trying to understand how HBase could be used for ad-hoc aggregation queries across our data. My understanding is MapReduce is more ...
    Jan 11, 2012 at 6:59 pm
    Jan 11, 2012 at 7:52 pm
  • Hello, I have installed HBase-0.90.4 on my local machine and as shown in "quick start " i installed/configured in standalone mode using my local file system of fedora-15. I have not started hadoop ...
    Neetu OjhaNeetu Ojha
    Jan 5, 2012 at 9:35 am
    Jan 5, 2012 at 11:56 am
  • Hi, i am using the input of a mapper as a rowkey to make a GET Request to a table. Is it somehow possible to retrieve information about how much data had to be transferred over network or how many of ...
    Christopher DornerChristopher Dorner
    Jan 9, 2012 at 9:19 pm
    Feb 14, 2012 at 6:08 pm
  • Dear all, I am a new user of HBase. I wonder the ranking strategy in HBase. I am now using Solr to manage the large amount of data in my system. I got one issue when loading data from Solr. In most ...
    Bing LiBing Li
    Jan 29, 2012 at 8:00 pm
    Jan 30, 2012 at 6:53 am
  • Hi all, We found so many hlogs in our cluster, after some analysis, we also found one splitted region occurred in HLog.lastSeqWritten. For this region had been closed, it can't be flushed again. So ...
    Jan 25, 2012 at 4:57 am
    Jan 25, 2012 at 6:45 am
  • Does 0.92 support a significant increase in row size over 0.90.x? With 0.90.4 we have seen writes start choking at 30 million cols/row and reads start choking at 10 million cols/row. Can we assume ...
    Jan 20, 2012 at 7:43 pm
    Jan 23, 2012 at 2:43 pm
  • Hi, I am trying to figure out if Hbase is the right candidate for my use case which is as follows : I have a users table containing millions users and for each user I have a bunch of data points for ...
    Amit GuptaAmit Gupta
    Jan 20, 2012 at 10:10 pm
    Jan 21, 2012 at 1:49 pm
  • Hi, After an upgrade of hadoop and hbase (to 0.90.4-cdh3u2) from 0.90 hbase and 0.20-append hadoop on a single node test installation everything worked fine initially. Then there was some DNS changes ...
    Henning BlohmHenning Blohm
    Jan 17, 2012 at 3:20 pm
    Jan 20, 2012 at 7:50 am
  • Hello, I want to measure requests per second for each Region Server during inserts on a table that is spread over this Region Servers. So during inserts I run local java app to grab the Region Server ...
    Christian SchäferChristian Schäfer
    Jan 7, 2012 at 5:10 pm
    Jan 11, 2012 at 1:36 am
  • In DN logs, There are a lot of "480000 millis timeout" exceptions when some scans finished, But Region server have no exceptions. I analyzed the flow of HBase and Hadoop. I found we are using API ...
    Jan 9, 2012 at 5:15 am
    Jan 9, 2012 at 8:31 pm
  • Hi, I just want to know if anyone has any idea on what POC I could make using Hadoop? I want to build something that has real world usage and not something just to learn hadoop. So I'd like to make ...
    Kumar vaibhavKumar vaibhav
    Jan 29, 2012 at 1:04 pm
    Feb 13, 2012 at 4:51 pm
  • Hii there I earlier used hbase locally , using my ext3 as filesystem for hbase. That worked ok :) . Now I moved on to next step of setting it up on hdfs. I am using hadoop-0.20.2 and hbase0.90.4 in ...
    Jan 26, 2012 at 5:17 pm
    Jan 29, 2012 at 11:23 am
  • hi, i try to use hbase 0.90.5 as db-backend to store data from a servlet. i created the table manually via hbase shell, but call Configuration config = HBaseConfiguration.create(); from servlet fails ...
    Kim young illKim young ill
    Jan 22, 2012 at 12:50 am
    Jan 22, 2012 at 10:15 pm
  • Hi All, I like to know if HBase.Client.Result.getValue(...) and Result.getColumn(...) fetch actual value from TABLE everytime or is it available in Result/ResultScanner already? -- Alok
    Alok KumarAlok Kumar
    Jan 20, 2012 at 8:48 am
    Jan 21, 2012 at 3:05 pm
  • I recently bumped up the region size memory configuration on our HBase cluster and after doing a rolling restart of our 5 nodes I saw the following in the HBase status page: Regions in Transition ...
    Jan 20, 2012 at 6:42 pm
    Jan 21, 2012 at 6:29 am
  • Hi, I have installed HBase 0.90.5 on Ubuntu 11.10 and ran the bin/start-hbase.sh command without any changes to the configuration files. jps outputs only HMaster and in the log file the below ...
    Praveen SripatiPraveen Sripati
    Jan 18, 2012 at 11:19 am
    Jan 19, 2012 at 3:56 am
  • Hello, I tried to find the information in the documentation but it is still not clear to me. I do a lot of bulk loading using the MapReduce job whose output is HFiles that are automatically loaded to ...
    Stanislav BartonStanislav Barton
    Jan 11, 2012 at 6:50 pm
    Jan 17, 2012 at 2:20 pm
  • Hello, I tried to import a table from hbase 0.90.3 to hbase 0.90.4 on a different cluster by copying the data between those two clusters. I uploaded the data into HDFS and called add_table.rb on ...
    Stanislav BartonStanislav Barton
    Jan 10, 2012 at 4:18 pm
    Jan 13, 2012 at 10:16 am
  • i was scanning through different questions that people asked in this mailing list regarding choosing the right schema so that map reduce jobs can be run appropriately and hot regions avoided due to ...
    T Vinod GuptaT Vinod Gupta
    Jan 10, 2012 at 11:26 am
    Jan 11, 2012 at 2:30 am
  • Hello all, I am a new HBase user with a familiar problem. I need to efficiently return the last 100 rows from an account. I searched the archives, and read the book, but did not find a complete ...
    Peter WolfPeter Wolf
    Jan 5, 2012 at 9:42 pm
    Jan 6, 2012 at 4:21 pm
  • I am crawling different industry data and storing the data into single hbase table. For example I am crawling Electronics and Computer industries and stored in a table called 'industry_tbl'. Now I ...
    Karthik PandianKarthik Pandian
    Jan 2, 2012 at 7:09 am
    Apr 13, 2012 at 7:36 pm
  • Hello, I'm thinking of using HBase to store a matrix, so each subblock of a matrix is stored as a value in HBase, and the key of the value is the location of the subblock in the matrix. At beginning, ...
    Zheng DaZheng Da
    Jan 31, 2012 at 1:28 am
    Feb 1, 2012 at 5:34 pm
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145 users for January 2012

Stack: 65 posts Ted Yu: 35 posts Doug Meil: 34 posts Jean-Daniel Cryans: 26 posts Peter Wolf: 24 posts T Vinod Gupta: 19 posts Royston Sellman: 18 posts Leonardo Gamas: 15 posts Harsh J: 14 posts Yonghu: 14 posts Praveen Sripati: 12 posts Stuti Awasthi: 12 posts Lars hofhansl: 11 posts Dalia Sobhy: 10 posts Kim young ill: 10 posts Michael Segel: 10 posts Andrew Purtell: 8 posts Invisible.Trust: 8 posts Neil Yalowitz: 8 posts Yves Langisch: 8 posts
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