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Search results for hbase application :
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Re: Coprocessors vs MapReduce? - HBase - [mail # user]
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... on the cluster each and every time. In contrast, HBase coprocessors can be thought of like Linux loadable kernel modules. You add them to your infrastructure. HBase becomes more like an application...
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... was loaded by the JVM will remain resident until the regionserver process is restarted. ... as a MapReduce job. MR jobs in Hadoop are really each individual submissions of application code to run...
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| ... deployment platform where the details of data colocation with the application code at scale is handled for you automatically, as is client side dispatch to the appropriate locations. An early design... |
| ... of coprocessors considered code shipping at request time, but that doesn't fit the extension model above well. But also consider that HBase is a short-request system. The latency of processing each... |
| ... the bytecode for execution and then removing it for GC. A coprocessor can be an Observer, linked in to server side function. Parameters are handed to your installed extension via upcall from HBase... |
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Author: Andrew Purtell,
2012-07-24, 19:05
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Re: data mining - HBase - [mail # user]
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... White) Patel Sent: Thursday, October 27, 2011 5:02 PM adoop I can notice and I was just rement is to run HBase with web application I am kind of curious to w how stumbleupon or facebook...
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... does it. ut doesn't look like right solution. sh orysmedical.com>wrote: e.apache.org/book.html) t way to learn HBase is to use it. PM, "Jean-Daniel Cryans" Mon, Oct 24, 2011 at 1:21 PM...
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| ... can make on my limited knowledge about hadoop and hbase. robably read up a bit more then. May I suggest: "Hadoop: The Definitive Guide": 9389732/ tive Guide": which one to opt? 2:49 PM... |
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Author: Andrew Purtell,
2011-10-28, 00:05
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Re: MiniMRCluster usage in dependent projects - Hadoop - [mail # general]
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... not be an interface for system testing exactly, it would be for the client to simulate failures that might happen from its perspective. This isn't just about HBase. What about Pig or Hive or Giraph...
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... HBase tests to MiniMRClientCluster (or even MRUnit)? If so, then I would agree I'm raising something without a clear use case and we could do that migration. Regarding HDFS miniclusters...
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| ..., the interface is already limited-private and there is no pressing need, but we do have test cases where we need to simulate DataNode failures. Also, I can conceive of an application unit test where I... |
| ... would want to set replication to 1 on some file, then corrupt blocks, then check that repair (at the application level) was successful. Would some limited public interface for that be plausible... |
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Author: Andrew Purtell,
2012-05-11, 00:38
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Re: [VOTE] Release hadoop-2.0.0-alpha - Hadoop - [mail # general]
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...'s worth thinking about the miniclusters differently? Please pardon i f I am rehashing an old discussion. Things like MRUnit for applications and BigTop for full cluster tests can he lp...
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..., but for as mentioned in the below annotation Pig, Hive, HBase, and other parts of the stack use miniclusters for local end to end testing in unit te sts. As the complexity of the stack increases and we...
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Author: Andrew Purtell,
2012-05-10, 01:05
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Re: [DISCUSS] Apache Hadoop 1.0? - Hadoop - [mail # general]
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... t such as HBase, Hive or Pig isn't the 'normal These projects can choose to use Private) apis and we are committed to ooth transition. downstream of, which have since been fixed are...
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...: owse/HBASE-4510 -> fixed the internal HDFS apis apache.org/jira/browse/MAPREDUCE-3138 (we fixed MR to allow apps with inconsistency in 'new' MR apis which changed in 0.21). t aware...
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| ... of anything else - what else do you see? downstream projects ensure their own end-users and applications apps, Pig scripts, Hive queries) etc. do NOT see any incompatibilities. In addition... |
| ..., MAPREDUCE-3169. I had to pull out a bunch of HBase uni t tests today to get 0.92 compiling on 0.23. - Andy ... |
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Author: Andrew Purtell,
2011-11-17, 21:07
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Re: Add client complexity or use a coprocessor? - HBase - [mail # user]
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... atomic increments)? the idea of an atomic bitfield operation as part of the core API is ntriguing. It has applicability to your estimator use case and I can think of a this idea, regards...
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... of a field? e: articular table and replace the provided data with co-processor ue, so the actual user ID never HBase). tes to the data ve //hbase.apache.org/apidocs/org/apache/hadoop/hbase...
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| .../client/HTable.html#incre mentColumnValue%28byte[],%20byte[],%20byte[],%20long,%20boolean%29 che.org/apidocs/org/apache/hadoop/hbase/client/Increment.html allows single round trip. This would give you accurate th... |
| ... to worry about atomic HBase ic I believe it will add to my overall architecture. or your time, and I look forward to hearing and #3, om/blog/2012/4/5/big... |
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Author: Andrew Purtell,
2012-04-13, 22:32
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Re: Cannot create table over REST - HBase - [mail # user]
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...Try curl -v -X PUT \ http://localhost:8080/test/schema \ -H "Accept: application/json" \ -H "Content-Type: applic ation/json" \ -d '{"name...
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...":"test","ColumnSchema":[{"name":"data"}]} ' You should see: gent: curl/7.21.3 (x86_64-pc-linux-gnu) libcurl/7.21.3 OpenSSL/0.9.8o zlib/ 1.2.3.4 libidn/1.18 September 13, 2011 1:15 PM -H "Accept: application/json" \ tion...
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| .../json" \ data"}]}' m.sun.jersey.spi.container.ContainerResponse tion -throwing to at org.apache.hadoop.hbase.util.Bytes.toBytes(Bytes.jav a:401) ... |
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Author: Andrew Purtell,
2011-09-13, 23:11
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Re: Add client complexity or use a coprocessor? - HBase - [mail # user]
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... feature like atomic increments)? I think the idea of an atomic bitfield operation as part of the core API is intriguing. It has applicability to your estimator use case and I can think...
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... of a field? this should be a new operation. It does sound some sort of atomic bitfield. - Andy itting back. - Piet Hein Original Message ----- To: user@hbase.apache.org 0:14 PM tunately, I...
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| .../HTable.html#incrementColumnValue%28byte[],%20byte[],%20byte[],%20long ,%20boolean%29 apache.org/apidocs/org/apache/hadoop/hbase/client/Increment.html This would give you accurate counts even s. on the ate multiple... |
| ... updates to the same cube within some of time. dy ack. - Piet Message ----- To: user@hbase.apache.org ay, April 9, 2012 9:48 AM se a coprocessor? I from each of our entralized platform... |
| ... and spread for processing and inserting into HBase is group can be scaled horizontally). The data is stored in ious ching ghts as to the most ta so I can count unique TV viewers ke netflix... |
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Author: Andrew Purtell,
2012-04-10, 23:53
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Re: Scan performance on a big table as combination of multiple logic tables - HBase - [mail # dev]
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... (rather ing to make all sorts of application level code to do what HBase y does). PM, Pan, Thomas wrote: s tailored to handle one table very well, we are thinking to multiple tables into one big...
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... , and to keep overheads down. I advise our ops people to set notificat ions for when the number of regions per HBase RegionServer gets above 500. The more regions per server, the more must...
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| ... be relocated per server failure, the longer some regions will be in transition. When we get close to the li mit, it's time to add another RegionServer. (Even if HBase could handle 10, 000 regions per... |
| ... you'd otherwise have , I understand that and would concur with Vladimir's However, if you're really looking at 10 tables versus one ems like HBase is built exactly to make that work well... |
| ... table but on different column family sets. As mn y checking the column family lue filters first before really going K-V pairs? It would be great if the Hbase code hat way. Confidentiality... |
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Author: Andrew Purtell,
2012-02-16, 01:43
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Re: Pull instant schema updating out? - HBase - [mail # dev]
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...'t have an opinion about addition or removal of column families, but online CF addition could be useful when evolving application design yet maintaining high availabili ty. Best regards...
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....94 where we have two ays to alter tables without disabling them and I don't pretty sure most of the devs don't even know which over the other when both are enabled without right now hbase...
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Author: Andrew Purtell,
2012-04-03, 00:45
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