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Re: HBase failure scenarios - HBase - [mail # user]
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...Hi Lucas, First, the write request for HBase consists of two parts: 1. Write into WAL; 2. Write into Memstore, when Memstore reaches the threshold, the data in Memstore will be flushed...
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Author: yonghu,
2013-06-11, 06:15
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Re: Poor HBase map-reduce scan performance - HBase - [mail # user]
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...Dear Sandy, Thanks for your explanation. However, what I don't get is your term "client", is this "client" means MapReduce jobs? If I understand you right, this means Map functio...
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Author: yonghu,
2013-06-05, 18:14
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Re: Poor HBase map-reduce scan performance - HBase - [mail # user]
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...Can anyone explain why client + rpc + server will decrease the performance of scanning? I mean the Regionserver and Tasktracker are the same node when you use MapReduce to scan the HBase tab...
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Author: yonghu,
2013-06-05, 14:55
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Re: Change data capture tool for hbase - HBase - [mail # user]
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...Hello, I have presented 5 CDC approaches based on HBase and published my results in adbis 2013. regards! Yong On Mon, Jun 3, 2013 at 11:16 AM, yavuz gokirmak w...
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Author: yonghu,
2013-06-03, 09:41
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Re: Doubt Regading HLogs - HBase - [mail # user]
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...In this situation, you can set the logroll.period to a short value, let's say 3000 and then you can see your log file with current size after 3 seconds. To Nicolas, I...
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Author: yonghu,
2013-05-17, 11:40
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How can I set heap size for HBase? - HBase - [mail # user]
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...Dear All, I wonder how I can set heap size for HBase and what is the suitable portion compared to whole memory size? And the other question is that how many memory size I need to give ...
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Author: yonghu,
2013-03-11, 11:15
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Re: Possible to delete a specific cell? - HBase - [mail # user]
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...Hello, I think you can use HBase org.apache.hadoop.hbase.client.Delete class. It already supported to delete a specific version in a cell, see public Delete deleteColumn(byte[] family,...
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Author: yonghu,
2013-03-07, 20:56
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Re: Hbase table with a nested entity - HBase - [mail # user]
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...Hello Dastgiri, I don't think HBase can support original nested schema which you want to define. But you can still store your data in HBase. I figured out several possible solutions: &...
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Author: yonghu,
2013-02-27, 11:06
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Re: coprocessor enabled put very slow, help please~~~ - HBase - [mail # user]
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...Ok. Now, I got your point. I didn't notice the "checkAndPut". regards! Yong On Mon, Feb 18, 2013 at 1:11 PM, Michael Segel wrote:...
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Author: yonghu,
2013-02-18, 12:22
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Re: coprocessor enabled put very slow, help please~~~ - HBase - [mail # user]
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...Hi, Michael I don't quite understand what do you mean by "round trip back to the client". In my understanding, as the RegionServer and TaskTracker can be the same node, MR don't have t...
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Author: yonghu,
2013-02-18, 10:57
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