Grokbase Groups HBase user April 2014

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93 discussions - 509 posts

  • Hi I have java code: import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.hbase.HBaseConfiguration; import org.apache.hadoop.hbase.HColumnDescriptor; import ...
    Apr 10, 2014 at 8:12 am
    Apr 12, 2014 at 10:34 pm
  • Hi to everybody, I have a probably stupid question: is it a problem to run many mapreduce jobs on the same HBase table at the same time? And multiple jobs on different tables on the same cluster? ...
    Flavio PompermaierFlavio Pompermaier
    Apr 4, 2014 at 10:09 am
    May 28, 2014 at 1:11 pm
  • Hey all. I have some questions regarding row key and column design. We want to calculate some metrics based on our page views broken down by hour, day, month and year. We also want this broken down ...
    Software DevSoftware Dev
    Apr 29, 2014 at 10:34 pm
    May 2, 2014 at 12:18 am
  • Hi, i am running webapp written on jaxrs framework which performs CRUD opereations on hbase. app was working fine till last week, now when i perform reading opeartion from hbase i don't see any data, ...
    Yeshwanth kumarYeshwanth kumar
    Apr 22, 2014 at 12:19 pm
    Apr 27, 2014 at 7:11 pm
  • I have a small hbase cluster with 1 namenode, 1 secondary namenode, 4 datanode. and the hbase master is on the same machine with namenode, 4 hbase slave on datanode machine. I found average requests ...
    Li LiLi Li
    Apr 22, 2014 at 2:40 am
    Apr 24, 2014 at 6:59 am
  • Hi, iam trying run HBase on hadoop 2.2 but master can't start. I found a message in master log (snipped): 2014-04-23 20:58:24,246 FATAL org.apache.hadoop.hbase.master.HMaster: HBase is having a ...
    Lukáš DrbalLukáš Drbal
    Apr 23, 2014 at 7:15 pm
    May 22, 2014 at 4:11 am
  • I am using HDP 2.0.6, which has 18 nodes(region servers). One of my HBase tables has 50 regions but I found that the 50 regions all stay in just two nodes, not spread evenly in the 18 nodes. I did ...
    Tao XiaoTao Xiao
    Apr 15, 2014 at 11:40 am
    Apr 17, 2014 at 4:55 pm
  • Hi Guys I'm using hbase org.apache.hadoop.hbase.mapreduce.Export / org.apache.hadoop.hbase.mapreduce.Import to backup and restore HBase data, at least it's good to me, i would like to know if there ...
    R WR W
    Apr 2, 2014 at 5:57 am
    Apr 23, 2014 at 8:54 pm
  • Hi, When I export large table with 460+ regions, I saw the exportSnapshot job fail sometime (not all the time). The error of the map task is below: But I verified the file highlighted below, it does ...
    Tianying ChangTianying Chang
    Apr 30, 2014 at 4:21 pm
    May 1, 2014 at 4:19 am
  • Hi, we use a script to take on a regular basis snapshot's and delete old one's. We recognizes that the web interface of the hbase master was not working any more becaues of too many open files. The ...
    Hansi KloseHansi Klose
    Apr 17, 2014 at 1:52 pm
    May 10, 2014 at 11:04 pm
  • hi,maillist: i try check content of storefile use HFile tool,but i get error ,anyone know how to fix it? i use hbase-0.94.6. # hbase -v -f ...
    Ch huangCh huang
    Apr 9, 2014 at 3:55 am
    Apr 11, 2014 at 9:44 pm
  • Hi, All! I need help! I run the java client to write 3million data into HBase, but when wrote almost 1 million, the process was blocked without any exception. Does anyone know the possible reason? So ...
    Apr 30, 2014 at 1:28 am
    May 4, 2014 at 10:48 am
  • Dear All, My current hbase environment is heavy write cluster with constant 2000+ insert rows / second spread to 10 region servers. Each day I also need to do data deletion, and that will add a lot ...
    Henry HungHenry Hung
    Apr 25, 2014 at 6:07 am
    May 2, 2014 at 2:26 am
  • After our first release of *HSearch* (announced in this forum) back in December 2010, we have been working at it incorporating customer feedback from their production deployments. Recently, we ...
    Apr 16, 2014 at 10:33 am
    Apr 18, 2014 at 2:14 pm
  • hi, is hbase 0.94.x versions compatible with hadoop 2.2 i checked the apache hbase website there it mentioned as NT(not tested) thanks, yeshwanth.
    Yeshwanth kumarYeshwanth kumar
    Apr 30, 2014 at 3:20 pm
    May 1, 2014 at 4:31 pm
  • Hi, I am planning to write endpoint coprocessor to calculate TOP N results for my usecase. I got confused with old apis and new apis. I followed below links and try to implement. But looks like api's ...
    Bogala, Chandra ReddyBogala, Chandra Reddy
    Apr 10, 2014 at 11:29 am
    Apr 15, 2014 at 5:11 pm
  • I want to create a large dateset for HBase with different versions and number of rows. It's about 10M rows and 100 versions to do some benchmarks. What's the fastest way to create it?? I'm generating ...
    Guillermo OrtizGuillermo Ortiz
    Apr 14, 2014 at 11:51 am
    Apr 14, 2014 at 10:03 pm
  • Hi All, In a master-slave replication, is it possible to replicate only the addition of rows?. If I delete in the master it shouldn't be deleted in the slave. -- Cheers, Manthosh Kumar. T
    Manthosh Kumar TManthosh Kumar T
    Apr 4, 2014 at 8:01 am
    Apr 9, 2014 at 3:36 pm
  • hi all, with the same read/write data, will threads count affect performance? e.g. I have 10,000 write request/second. I don't care the order very much. how many writer threads should I use to obtain ...
    Li LiLi Li
    Apr 28, 2014 at 10:27 am
    Apr 29, 2014 at 1:55 am
  • Hi all, I understand that there is a significant improvement gain when turning on short circuit reads, and additionally by setting HBase to do checksums rather than HDFS. However, I'm a little ...
    Krishna RaoKrishna Rao
    Apr 24, 2014 at 12:56 pm
    Apr 29, 2014 at 7:16 pm
  • Hi, How do I get all rows from .META. pertaining to a specific table? I don't want to scan all of .META. and then do a grep on the output since .META. is quite large but I don't know how to use HBase ...
    David KochDavid Koch
    Apr 25, 2014 at 9:50 am
    Apr 25, 2014 at 4:26 pm
  • I have a big table and rows will be added to this table each day. I wanna run a MapReduce job over this table and select rows of several days as the job's input data. How can I achieve this? If I ...
    Tao XiaoTao Xiao
    Apr 21, 2014 at 3:04 pm
    Apr 24, 2014 at 3:18 am
  • Mon Apr 14 23:54:40 CST 2014, [email protected], Could not reseek StoreFileScanner[HFileScanner for reader ...
    Li LiLi Li
    Apr 15, 2014 at 12:32 am
    Apr 15, 2014 at 3:14 pm
  • Hi, I have one region server which needs to be rebooted for server maintenance. The server hosts both the hadoop and hbase slave(hadoop2-hbase 0.96). What is the recommended steps to reboot it ...
    Rural HunterRural Hunter
    Apr 9, 2014 at 1:58 pm
    Apr 11, 2014 at 7:55 am
  • Hi All, I have around 20-30 geographically distant clients that need to write data to a centralized HBase server. I have dedicated VPN for the communication and hence bandwidth won't be a issue. is ...
    Manthosh Kumar TManthosh Kumar T
    Apr 3, 2014 at 1:00 pm
    Apr 3, 2014 at 2:10 pm
  • I have a requirement of processing huge weblogs on daily basis. 1. data will come incremental to datastore on daily basis and I need cumulative and daily distinct user count from logs and after that ...
    Shushant AroraShushant Arora
    Apr 30, 2014 at 8:35 am
    Apr 30, 2014 at 1:03 pm
  • I have a full table scan which cost about 10 minutes. it seems a bottleneck for our application. if use map-reduce to rewrite it. will it be faster?
    Li LiLi Li
    Apr 14, 2014 at 6:09 am
    Apr 15, 2014 at 12:30 am
  • Hi, I face a "strange" issue today. I stopped my cluster to merge some regions. When I tried to restart it, one server got stuck. If I try to stop the cluster, this server ignore the request and stay ...
    Jean-Marc SpaggiariJean-Marc Spaggiari
    Apr 29, 2014 at 2:38 pm
    Apr 30, 2014 at 1:21 am
  • Hello, Does anybody know how to develop a custom LoadBalancer for HBase? What is the development process? And how to use my custom LoadBalancer? Do I need to re-compile the whole HBase source code? ...
    LEI XiaofengLEI Xiaofeng
    Apr 7, 2014 at 11:56 am
    Apr 7, 2014 at 12:37 pm
  • I'm using HBase with MapReduce to load a lot of data, so I have decide to do it with bulk load. I parse my keys with SHA1, but when I try to load them, I got this exception. ...
    Guillermo OrtizGuillermo Ortiz
    Apr 30, 2014 at 3:57 pm
    May 6, 2014 at 12:18 pm
  • Hi We have a requirement in which we have to get the scan result sorted on a particular column. eg. *Get Details of Authors sorted by their Publication Count. Limit :1000 * *Row Key is a MD5 hash of ...
    Vikram Singh ChandelVikram Singh Chandel
    Apr 29, 2014 at 9:13 am
    May 2, 2014 at 8:33 pm
  • Hi all, Here what i want to do is i want to firstly need to create and a column family and then need to create a column for data to be added later. Here i can not use PUT command as it requires a ...
    Chamika KasunChamika Kasun
    Apr 29, 2014 at 6:08 pm
    Apr 29, 2014 at 7:23 pm
  • Any recommendations on how to limit the bandwidth consumption of an ExportSnapshot job? I'd like to control bandwidth consumption so important network workloads, like shuffling and balancing, are ...
    Scott KuehnScott Kuehn
    Apr 24, 2014 at 4:17 pm
    Apr 27, 2014 at 12:21 am
  • I found one of 4 region server is heavy load than other. and I want to split region manully. from the web ui name: vc2.url_db,,1398174763371.35a8599a5eb457b9e0210f86d8b6d19f. region ...
    Li LiLi Li
    Apr 24, 2014 at 3:21 am
    Apr 24, 2014 at 3:51 am
  • Hi, We have a use case where some data are mostly random read, so it polluted cache and caused big GC. It is better to turn off the block cache for those data. So we are going to call ...
    Tianying ChangTianying Chang
    Apr 16, 2014 at 11:41 pm
    Apr 18, 2014 at 6:55 am
  • Hi, I wrote a little script which should control the running replication. The script is triggered by cron and executes the following command with the actual time stamp in "endtime" and a time stamp = ...
    Hansi KloseHansi Klose
    Apr 14, 2014 at 10:06 am
    Apr 17, 2014 at 1:25 pm
  • Hello all, When I take a snapshot on cluster 1, copy it to cluster 2 using ExportSnapshot utility, what permissions should I set on the snapshot to be able to clone it into a new table? I matched the ...
    Artem ErvitsArtem Ervits
    Apr 9, 2014 at 9:09 pm
    Apr 10, 2014 at 12:43 am
  • Hi all, I read an article yesterday about Hbase. It says if a region server has a performance hit by heavy IO, that will impact the whole cluster. So I want to know how a single node's performance ...
    Libo YuLibo Yu
    Apr 2, 2014 at 2:59 pm
    Apr 3, 2014 at 7:49 pm
  • I'm using Hortonworks HDP and my HBase cluster has 14 nodes and one of them crashed today (there is no job running). I looked up the crashed region server's log and found that its logging paused for ...
    Tao XiaoTao Xiao
    Apr 3, 2014 at 2:45 am
    Apr 3, 2014 at 5:58 pm
  • Hey All - I'm having some strange results using FuzzyRowFilter. I'm programming in jython for that extra bit of adventure. My hbase key looks something like [random 10bytes][servicetype ...
    Liam SlusserLiam Slusser
    Apr 25, 2014 at 1:24 am
    Apr 25, 2014 at 9:02 am
  • Mighty Hbase users and developers, I have few questions and I'd really appreciate it if someone can clarify them. 1) I want to know if Hbase inherently supports *atomic append*functionality like ...
    GSK ChaitanyaGSK Chaitanya
    Apr 14, 2014 at 5:11 pm
    Apr 16, 2014 at 6:23 am
  • I have a table in Hbase that sizes around 96Gb, I generate 4 regions of 30Gb. Some time, table starts to split because the max size for region is 1Gb (I just realize of that, I'm going to change it ...
    Guillermo OrtizGuillermo Ortiz
    Apr 15, 2014 at 9:46 am
    Apr 15, 2014 at 10:35 am
  • for hbase 0.98.1 how do I find a list of jar files that I would need to add to HBASE_CLASSPATH in order to start a regionserver?
    John HancockJohn Hancock
    Apr 12, 2014 at 2:02 pm
    Apr 14, 2014 at 5:13 pm
  • Hey folks, Stack published a writeup I did on the HBase blog on the effects of rowkey size, column-name size, CF compression, data block encoding and KV storage approach on HFile size. For example, ...
    Doug MeilDoug Meil
    Apr 11, 2014 at 9:23 pm
    Apr 12, 2014 at 12:11 pm
  • I'm currently running into an issue on my local setup where my application is unable to connect to the hbase table but I'm successfully able to query the table using hbase shell. I'm using HTable ...
    Apr 9, 2014 at 7:29 pm
    Apr 11, 2014 at 6:42 am
  • Hi I downloaded and installed hortonworks sandbox 2.0 for virtualbox. HBase version is:, re6d7a56f72914d01e55c0478d74e5cfd3778f231 [[email protected] twitbase-master]$ cat ...
    Apr 9, 2014 at 4:58 pm
    Apr 10, 2014 at 9:30 pm
  • is hbase 0.97 support 64 bit? or should complied from 32 bit to 64 bit? Thanks! beatls
    Hua beatlsHua beatls
    Apr 8, 2014 at 12:55 pm
    Apr 8, 2014 at 3:54 pm
  • I am currently trying to create another hbase cluster by exporting snapshots from our main storage. While it worked well for the smaller tables, it failed on timeouts on larger tables while trying to ...
    Apr 8, 2014 at 6:53 am
    Apr 8, 2014 at 1:32 pm
  • I need data versioning but want to keep older data in a separate location (to keep the current data file denser). What would be the best way to do that?
    Mike PetersonMike Peterson
    Apr 3, 2014 at 3:35 pm
    Apr 5, 2014 at 6:43 pm
  • Hi all, To test 0.8.1, I recently upgraded our kafka from 0.8-beta1 to 0.81. For the same config, I''ve noticed high cpu usage (20% to more than 70%) on several clusters. Our production is using ...
    Libo YuLibo Yu
    Apr 5, 2014 at 2:54 am
    Apr 5, 2014 at 2:12 pm
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103 users for April 2014

Ted Yu: 99 posts Jean-Marc Spaggiari: 39 posts Li Li: 26 posts Michael Stack: 13 posts Gortiz: 12 posts Lars hofhansl: 12 posts Yeshwanth kumar: 12 posts Software Dev: 11 posts Tao Xiao: 11 posts Tianying Chang: 11 posts Guillermo Ortiz: 10 posts Manthosh Kumar T: 9 posts Hansi Klose: 8 posts Matteo Bertozzi: 8 posts Azuryy Yu: 6 posts R W: 6 posts Anoop John: 5 posts Asaf Mesika: 5 posts Demai Ni: 5 posts Jingych: 5 posts
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