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What is in BlockCache? - HBase - [mail # user]
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...Hi, All, I am wondering what is exactly stored in BlockCache: Is it the same raw blocks as in HFile? or does HBase merge several raw blocks and store the merged block in cache to serve futur...
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Author: yun peng,
2013-05-20, 12:07
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Re: How practical is it to add a timestamp oracle on Zookeeper - HBase - [mail # user]
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...Hi, Jean and Jieshan, Are you saying client can directly contact region servers? Maybe I overlooked, but I think the client may need lookup regions by first contacting Zk as in figure 8-11 f...
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Author: yun peng,
2013-04-16, 12:40
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How practical is it to add a timestamp oracle on Zookeeper - HBase - [mail # user]
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...Hi, All, I'd like to add a global timestamp oracle on Zookeep to assign globally unique timestamp for each Put/Get issued from HBase cluster. The reason I put it on Zookeeper is that each Pu...
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Author: yun peng,
2013-04-16, 12:14
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Re: On source code of File Section mechanism in minor compaction - HBase - [mail # user]
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...Hi Ted, thanks a lot for the reference. Ted and All, I have additional minor question though. Would a flush in HBase cause cascaded minor compaction? To be more specific, when a minor ...
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Author: yun peng,
2013-04-11, 19:24
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Re: On source code of File Section mechanism in minor compaction - HBase - [mail # user]
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...Sorry to not mention the version. I am looking at version 0.94.2 which seems file RatioBasedCompactionPolicy is not yet in. regards, Yun On Thu, Apr 11, 2013 at 11:00 AM, Ted Yu ...
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Author: yun peng,
2013-04-11, 15:04
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On source code of File Section mechanism in minor compaction - HBase - [mail # user]
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...Hi, All I am asking the source code showing the file selection mechanism for minor compaction in HBase. I am aware that HBase minor compaction selects file based on size and generation time....
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Author: yun peng,
2013-04-11, 14:52
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How HBase perform per-column scan? - HBase - [mail # user]
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...Hi, All, I want to find all existing values for a given column in a HBase, and would that result in a full-table scan in HBase? For example, given a column C, the table is of very large numb...
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Author: yun peng,
2013-03-09, 19:11
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Re: Does HBase combine multiple Puts against the same region server? - HBase - [mail # user]
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...Is that done in current HBase implementation (say, 0.94.2 or more recent one) or it requires applications to handle it? Thanks for your note, Yun On Thu, Dec 6, 2012 at 1:42 PM, Jimmy ...
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Author: yun peng,
2012-12-06, 19:08
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Does HBase combine multiple Puts against the same region server? - HBase - [mail # user]
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...Hi, I have question on how the multiple Puts() are executed when they are issued against the same region server. For example, in the case of asynchronous executing Put() using setAutoF...
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Author: yun peng,
2012-12-06, 18:34
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Re: Is Put() operation a synchronous call on server side? - HBase - [mail # user]
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...Hi, Dong and Harsh, thanks for your detailed explanations. Based on Dong's answers, I summarise the call path a little bit. HTable.flushCommits()->HConnection.processBatch()->HConnecti...
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Author: yun peng,
2012-12-06, 18:32
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