Grokbase Groups HBase user April 2010

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98 discussions - 518 posts

  • Hello all, First, thanks to all the HBase developers for producing this, it's a great project and I'm glad to be able to use it. I'm looking for some help and hints here with insert performance help. ...
    Chris TarnasChris Tarnas
    Apr 29, 2010 at 1:27 am
    May 1, 2010 at 2:02 pm
  • Hello all, I am currently in the process of researching and learning about HBase (along with other column stores) as a potential solution for storing large amounts of physiologic data. In both ...
    Andrew NguyenAndrew Nguyen
    Apr 23, 2010 at 11:46 pm
    Jun 4, 2010 at 4:20 pm
  • Hi folks, I hope this is just a newbie problem. Context: - Running 0.20.3 tag locally in pseudo cluster mode - $HBASE_HOME is in env and $PATH - Running org.apache.hadoop.hbase.mapreduce.Export in ...
    George StathisGeorge Stathis
    Apr 9, 2010 at 9:27 pm
    Apr 11, 2010 at 4:59 pm
  • Hi, I have posted previously about issues I was having with HDFS when I was running HBase and HDFS on the same box both pseudoclustered. Now I have two very capable servers. I've setup HDFS with a ...
    Geoff HendreyGeoff Hendrey
    Apr 15, 2010 at 3:27 am
    Apr 19, 2010 at 10:03 pm
  • Hi, We are a startup who have decided to use HBase purely because we want to take advantage of HDFS based reliability, redundancy, MapReduce and BigTable. For that we are thinking to go for a test ...
    Imran M YousufImran M Yousuf
    Apr 5, 2010 at 4:52 pm
    Apr 10, 2010 at 4:47 pm
  • Hi Daniel, I removed the property tags from the hbase-site.xml. Same error occurs. Also one strange behaviour, If i give ./ , the terminal says stopping master ...
    Jayavelu jaisenthilkumarJayavelu jaisenthilkumar
    Apr 1, 2010 at 6:39 pm
    Apr 5, 2010 at 4:43 pm
  • We are working with a small HBase cluster (5 nodes) with fairly beefy nodes. While looking at why all the regionservers died at one time, noticed that these servers read some files 100s of times a ...
    Raghu AngadiRaghu Angadi
    Apr 8, 2010 at 2:50 am
    Apr 18, 2010 at 5:34 am
  • hi, all, I have posted a mail before, but I think with a different title I can get more help from you guys. Now in our 30 nodes cluster, we have built up a hbase cluster. we have noticed that the ...
    Steven zhuangSteven zhuang
    Apr 8, 2010 at 9:52 am
    Apr 14, 2010 at 4:41 am
  • Hi hbase users, during our tests on production environment we found few really big problems that stops us from using hbase. First major problem is availability: we have now 6 regions servers + 2 ...
    Michał PodsiadłowskiMichał Podsiadłowski
    Apr 26, 2010 at 4:14 pm
    Apr 27, 2010 at 6:49 pm
  • Hi, We've dumped oracele data to files then put these files into different hbase table. The size of these files is 35G; we saw the HDFS usage up to 562G after putting it into hbase. Is that ...
    Apr 1, 2010 at 12:54 am
    Apr 17, 2010 at 5:28 am
  • Hey folks, I am a grad student at the Univ of Texas – Austin doing some research into Cloudera Desktop. I have very little technical background so I’m trying to find out what actual Hadoop users ...
    Apr 8, 2010 at 4:51 pm
    Apr 10, 2010 at 4:56 pm
  • hi, All, Has anybody do scan on one table using multiple scanners at the same time and found some inconsistent problem? I am doing query on a table using dozens(20-120) of scanners in ...
    Steven zhuangSteven zhuang
    Apr 22, 2010 at 9:08 am
    Apr 22, 2010 at 10:29 pm
  • Dear All, Assumed, I've got a list of rowIDs of a HBase table. I want to get each row by its rowID, do some operations with its values, and store the results somewhere subsequently. Is there a good ...
    Apr 20, 2010 at 6:40 am
    Apr 21, 2010 at 6:18 am
  • Hi guys, I have about 8G Hbase table and I want to run MR job against it. It works extremely slow in my case. One thing I noticed is that job runs only 2 map tasks. Is it any way to setup bigger ...
    Andriy KolyadenkoAndriy Kolyadenko
    Apr 11, 2010 at 2:59 am
    Apr 11, 2010 at 10:13 pm
  • Hi , In the method "public org.apache.hadoop.mapred.InputSplit[] *getSplits* (org.apache.hadoop.mapred.JobConf job, int numSplits) " how is the "numSplits" decided ? I've seen differnt values of ...
    John smithJohn smith
    Apr 11, 2010 at 7:55 am
    Apr 11, 2010 at 9:28 am
  • Hi, I'd like to implement unique row ID constraint (like the primary key constraint in RDBMS) in my application framework. Here is a code fragment from my current implementation (HBase 0.20.4rc) ...
    Tatsuya KawanoTatsuya Kawano
    Apr 28, 2010 at 2:41 pm
    May 8, 2010 at 11:22 pm
  • Hi, Any pointers on how to optimize hbase for random access? My understanding is that HFile is decent at random access. Why doesn't it use memory mapped I/O? (my reading on it indicated it uses ...
    Geoff HendreyGeoff Hendrey
    Apr 26, 2010 at 6:34 pm
    Apr 27, 2010 at 3:29 am
  • Hbase shell is taking 63 seconds to scan a table with {LIMIT= 1}! I see this error occur frequently in the region server logs. Any ideas on what this might be 2010-04-20 04:19:41,401 INFO ...
    Geoff HendreyGeoff Hendrey
    Apr 20, 2010 at 5:29 pm
    Apr 20, 2010 at 11:39 pm
  • Hi, All I am benchmarking hbase. My HDFS clusters includes 4 servers (Dell 860, with 2 GB RAM). One NameNode, one JobTracker, 2 DataNodes. My HBase Cluster also comprise 4 servers too. One Master, 2 ...
    Chen BangzhongChen Bangzhong
    Apr 2, 2010 at 2:53 pm
    Apr 3, 2010 at 1:45 pm
  • Good day, I am using the Stargate REST interface to HBase for inserting data. When using JSON to transmit the query content, I have found that specific ordering of key/value pairs within the JSON ...
    Tyler CoffinTyler Coffin
    Apr 20, 2010 at 7:37 pm
    Jun 4, 2012 at 3:28 pm
  • Hi all, I'm trying to set up hbase on a cluster where each machine has multiple interfaces. Hdfs worked right away since I could just set the name node to listen on, but hbase region servers ...
    Dmitri garbuzovDmitri garbuzov
    Apr 28, 2010 at 11:14 pm
    Apr 29, 2010 at 2:57 pm
  • Hi, I am quite new to hbase but i love the simplified api and the way it scales. I currently have a 3 node cluster of virtual machines and removing and adding them is really easy. I am in some data ...
    Pierre-Alexandre St-JeanPierre-Alexandre St-Jean
    Apr 15, 2010 at 6:34 pm
    Apr 15, 2010 at 10:30 pm
  • Imagine you have a cloud of 100 hadoop nodes. In theory you could create multiple instances of HBase on the cloud. Obviously I don't think you could have multiple region servers running on the same ...
    Michael SegelMichael Segel
    Apr 29, 2010 at 8:31 pm
    Apr 30, 2010 at 2:52 pm
  • hi, sorry I start another thread here. This mail is actually answer to a previous thread "multiple scanners on same table will cause problem? Scan results change among different tries.". the mail ...
    Steven zhuangSteven zhuang
    Apr 23, 2010 at 3:11 am
    Apr 27, 2010 at 2:14 pm
  • Hi all, I have been importing a bunch of data into my hbase cluster, and I see the following error: Hbase error : hdfs.DFSClient: Exception in createBlockOutputStream Bad connect ...
    Sujee ManiyamSujee Maniyam
    Apr 13, 2010 at 6:38 pm
    Apr 13, 2010 at 9:39 pm
  • Hi all, I wrote my own getSplits() function for HBase-MR . "A" is a table involved in MR . I am getting the following stack trace. It seems that it couldn't access the region. But my region server is ...
    John smithJohn smith
    Apr 11, 2010 at 10:56 am
    Apr 11, 2010 at 10:25 pm
  • Occationally my HTable clients get a response that no server is serving a particular region... Normally, the region is back a few seconds later (perhaps a split?). Anyway, the client (Using ...
    Al LiasAl Lias
    Apr 8, 2010 at 6:38 am
    Apr 8, 2010 at 9:30 pm
  • Hi, I was trying to tune my HBase environment, following the stuff on the wiki and I have a question regarding the GC parallel threads setting. Is there a good 'rule of thumb' or formula like 1 ...
    Michael SegelMichael Segel
    Apr 7, 2010 at 8:36 pm
    Apr 8, 2010 at 7:21 pm
  • Hi all, I come across Overview (HBase 0.20.3 API) there they mentioned like <configuration ... <property <name hbase.rootdir</name <value hdfs://localhost:9000/hbase</value <description The directory ...
    Jayavelu jaisenthilkumarJayavelu jaisenthilkumar
    Apr 2, 2010 at 2:06 pm
    Apr 2, 2010 at 3:07 pm
  • Hi, I have a hadoop/hbase cluster running on 9 machines (only 8 GB RAM, 1 TB drives), and have recently noticed that Gets from Hbase have slowed down significantly. I'd say at this point I'm not ...
    Ruben QuinteroRuben Quintero
    Apr 30, 2010 at 3:36 pm
    May 1, 2010 at 12:33 pm
  • Hi everyone, I have a quick question -- I'd like to do a simple atomic check-and-Delete for a row. For Put operations, HTable.checkAndPut appears to allow a simple atomic compare-and-update, which is ...
    Michael DaltonMichael Dalton
    Apr 30, 2010 at 9:51 pm
    Apr 30, 2010 at 10:57 pm
  • We were running version 3.2.2 for about a month and it was working well for us. Then late this past Saturday night, our cluster went pathological. One of the 3 ZK servers spewed many WARNs (see ...
    Aaron CrowAaron Crow
    Apr 29, 2010 at 1:29 am
    Apr 30, 2010 at 5:38 pm
  • I have been fan of hbase for awhile, but until now I haven't had any extra hardware to setup and run an instance. Now I'm trying to decide what would be the most ideal setup. I have a 64 node ...
    Aaron McCurryAaron McCurry
    Apr 25, 2010 at 6:09 pm
    Apr 25, 2010 at 10:32 pm
  • Hi folks, I am thinking of building a testing environment for a HBase cluster on EC2, and I plan to build such an environment for the following reasons: 1) To have a reference throughput/read_latency ...
    Apr 21, 2010 at 5:59 am
    Apr 22, 2010 at 5:56 am
  • Hello all, Is it OK to mix transactional IndexTable and regular HTables in the same cluster? I am testing with both types and, while things seem to work ok in the hbase shell, I just got this ...
    George StathisGeorge Stathis
    Apr 16, 2010 at 2:33 pm
    Apr 20, 2010 at 1:06 am
  • Hi I am trying to use Hbase client in Tomcat, and I have in my WebContent/WEB-INF/lib folder these files: Zookeeper-3.2.2.jar hadoop-0.20.2-core.jar hbase-0.20.3.jar hbase-default.xml hbase-site.xml ...
    Victor HongVictor Hong
    Apr 18, 2010 at 2:45 am
    Apr 19, 2010 at 1:42 pm
  • Hi all, I work in a project where we need to deal with different types of biology data. For the first case, which I'm now investigating if HBase is something we might use the scenario is like this. ...
    Håkon SagehaugHåkon Sagehaug
    Apr 9, 2010 at 7:26 am
    Apr 16, 2010 at 10:22 am
  • I run into the following two issues related to HBase all the time, and therefore am wondering if there are any permanent fixes for these: 1) When I start Hadoop & HBase for the first time, and run a ...
    Something SomethingSomething Something
    Apr 12, 2010 at 9:21 pm
    Apr 13, 2010 at 4:10 am
  • **Hi all, I have a problem with a massive HBase loading job. It is from raw files to hbase, through some mapreduce processing + manipulating (so loading direcly to files will not be easy). After some ...
    Oded RosenOded Rosen
    Apr 1, 2010 at 8:19 pm
    Apr 12, 2010 at 6:32 pm
  • Hi, I got when the menstore reaches a configurable size(64MB), it's flushed to HDFS, and create a new StoreFile, therefore, when these StoreFiles more than 3 files, they will be compacted to a single ...
    Apr 7, 2010 at 2:22 am
    Apr 7, 2010 at 7:12 pm
  • hi, i'm totally new to hbase and mapreduce and could really need some pointer into the right direction for the following situation. i managed to run a basic mapreduce example - analog to ...
    Jürgen JakobitschJürgen Jakobitsch
    Apr 4, 2010 at 6:19 pm
    Apr 6, 2010 at 6:00 pm
  • Hi, Does anyone know more about the org.apache.hadoop.hbase.regionserver.LogFlusher? I don't know why does it just invoke SequenceFile.Writer.sync()? It just writes a maker into the file. Can anyone ...
    Apr 2, 2010 at 2:37 pm
    Apr 6, 2010 at 8:01 am
  • Hi, I am trying to create a unit test using the HBaseClusterTestCase and the RowCounter example. I am able to spin up a hbase table, load data inside, access the data (lookup and scan), but whenever ...
    Renaud DelbruRenaud Delbru
    Apr 19, 2010 at 5:56 pm
    Apr 22, 2010 at 2:04 am
  • I've spent some time looking through the regionscanner logic, in particular the filter related parts and would want to check if a) my current understanding is correct and b) if this may be subject to ...
    Juhani ConnollyJuhani Connolly
    Apr 19, 2010 at 3:47 am
    Apr 19, 2010 at 5:41 am
  • Hello, Today, when I entered "truncate 'users'" on hbase shell, it encountered an exception, and it didn't created the table (just disabled+dropped it). The master log does contain: 2010-04-16 ...
    Oded RosenOded Rosen
    Apr 16, 2010 at 8:20 pm
    Apr 17, 2010 at 9:02 am
  • For a slightly unrelated reason, I needed to write a quick app to test some code running on our hadoop/hbase cluster. However, I seem to be having issues with getting consistent reads. Here's the ...
    Charles GlommenCharles Glommen
    Apr 16, 2010 at 5:28 pm
    Apr 17, 2010 at 1:38 am
  • This is an HBase schema design question. Suppose I store blog enty details in an hbase table: blogid, blog_content, blog_author, blog_subject. My query is such that it always retrieves all this data ...
    N KapshooN Kapshoo
    Apr 15, 2010 at 4:05 pm
    Apr 15, 2010 at 5:52 pm
  • We're experiencing a recurring problem and wondering if others have seen this: We're mapping a table with about 2 million rows in 100 regions on 40 nodes. In each map, we're doing a random read on ...
    Joost OuwerkerkJoost Ouwerkerk
    Apr 10, 2010 at 11:39 pm
    Apr 13, 2010 at 6:36 pm
  • Some region server bad, I doubt. When I write record to HBase table, throw RetriesExhaustedException: Exception in thread "main" org.apache.hadoop.hbase.client.RetriesExhaustedException: Trying to ...
    Apr 7, 2010 at 8:34 am
    Apr 8, 2010 at 4:51 pm
  • greetings, while I was importing data into my HBase Cluster, I found one regionserver is down, and by check the log, I found following exceptoin: *EOFException*(during HBase flush memstore to HDFS ...
    Steven zhuangSteven zhuang
    Apr 6, 2010 at 3:38 am
    Apr 6, 2010 at 4:27 pm
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101 users for April 2010

Stack: 43 posts Jean-Daniel Cryans: 36 posts Ryan Rawson: 32 posts Michael Segel: 22 posts Amandeep Khurana: 20 posts Geoff Hendrey: 20 posts Jonathan Gray: 20 posts Andrew Purtell: 19 posts Steven zhuang: 16 posts George Stathis: 12 posts Todd Lipcon: 12 posts Chris Tarnas: 10 posts Ted Yu: 10 posts John smith: 9 posts Sujee Maniyam: 9 posts Tim Robertson: 9 posts Imran M Yousuf: 8 posts Jayavelu jaisenthilkumar: 8 posts Patrick Hunt: 8 posts Victor Hong: 7 posts
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