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What is in BlockCache? - HBase - [mail # user]
...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...
   Author: yun peng, 2013-05-20, 12:07
[expand - 1 more] - Re: How practical is it to add a timestamp oracle on Zookeeper - HBase - [mail # user]
...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...
   Author: yun peng, 2013-04-16, 12:40
[expand - 2 more] - Re: On source code of File Section mechanism in minor compaction - HBase - [mail # user]
...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 ...
   Author: yun peng, 2013-04-11, 19:24
How HBase perform per-column scan? - HBase - [mail # user]
...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...
   Author: yun peng, 2013-03-09, 19:11
[expand - 1 more] - Re: Does HBase combine multiple Puts against the same region server? - HBase - [mail # user]
...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 ...
   Author: yun peng, 2012-12-06, 19:08
[expand - 1 more] - Re: Is Put() operation a synchronous call on server side? - HBase - [mail # user]
...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...
   Author: yun peng, 2012-12-06, 18:32
Issues on disabling compaction in HBase 0.94.2 - HBase - [mail # user]
...Hi, I want to disable automatic compaction in HBase. Currently I used following configurations in conf/hbase-site.xml The problem is compaction does not really be disable. As write are issue...
   Author: yun peng, 2012-11-22, 23:50
[expand - 4 more] - Re: How to check if a major_compact is done? - HBase - [mail # user]
...Hi, as I recently find out, by spinning on  getStorefiles = task.getStores() may not be a robust method to check if a compaction is done. For instance, if the interval for checking is s...
   Author: yun peng, 2012-11-17, 01:03
How to monitor total disk access in HBase? - HBase - [mail # user]
...Hi, I want to profile the # of disk access (both random and sequential) issued from HBase (into HDFS). For disk reads, I have tried use blockCacheMissCount, which seems working. But is it th...
   Author: yun peng, 2012-11-10, 15:03
[expand - 2 more] - Re: What could cause HBase's writes slower than reads? - HBase - [mail # user]
...Yes Mohit, that's the cause! HBase is read values not present in datatable, which leads to very fast read performance. When I change it to reading valid values in data table, it is back to n...
   Author: yun peng, 2012-11-04, 15:08
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