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转发: seem "SafepointTimeout" doesn't work well if sync takes too long ? - HBase - [mail # dev]
...FYI. It would be pretty helpful if other folks hit the similar issue.  Best, Liang ________________________________ 发件人: Peter Levart [[EMAIL PROTECTED]] 发送时间: 2013年4月28日 17:50 收件人: 谢良 ...
   Author: 谢良, 2013-04-28, 11:29
答复: HBase random read performance - HBase - [mail # user]
...First, it's probably helpless to set block size to 4KB, please refer to the beginning of HFile.java:   Smaller blocks are good  * for random access, but require more memory to hold...
   Author: 谢良, 2013-04-15, 11:41
答复: hbase jvm problem - HBase - [mail # user]
...Would you have a chance to test w/o UseAdaptiveSizePolicy option? There's a related hotspot issue discussed several days ago: http://marc.info/?l=openjdk-serviceability-dev&m=136367606426463...
   Author: 谢良, 2013-04-08, 02:29
答复: Does HBase RegionServer benefit from OS Page Cache - HBase - [mail # user]
...Maybe we should adopt some ideas from RDBMS ? In MySQL area: Innodb storage engine has a buffer pool(just like current block cache), caches both compressed and uncompressed pages in latest i...
   Author: 谢良, 2013-03-26, 03:01
Is it feasible to delete qualified tombstones during minor compaction? - HBase - [mail # dev]
...Currently, all tombstones only get cleaned up with major compactions. I guess the original design probably considered that we need to ensure whether there are other versions of the deleted k...
   Author: 谢良, 2013-03-14, 09:41
答复: HBase CheckSum vs Hadoop CheckSum - HBase - [mail # user]
...comments in line  Regards, Liang ________________________________________ 发件人: Jean-Marc Spaggiari [[EMAIL PROTECTED]] 发送时间: 2013年2月26日 20:03 收件人: user 主题: HBase CheckSum vs Hadoop Chec...
   Author: 谢良, 2013-02-26, 12:24
答复: 答复: 答复: GC frequency - HBase - [mail # user]
...comments in line ________________________________________ 发件人: Varun Sharma [[EMAIL PROTECTED]] 发送时间: 2013年2月21日 17:21 收件人: [EMAIL PROTECTED] 主题: Re: 答复: 答复: GC frequency  This is a ver...
   Author: 谢良, 2013-02-21, 09:39
答复: 答复: GC frequency - HBase - [mail # user]
...Here is a good formula to estimate: http://blog.ragozin.info/2011/06/understanding-gc-pauses-in-jvm-hotspots.html   Hope it helpful:) ________________________________________ 发件人: Varun...
   Author: 谢良, 2013-02-21, 08:50
答复: GC frequency - HBase - [mail # user]
...Of course, you'll hit the nightmarish "CMS fragement" easier if NewSize too low:) Generally speaking, most of YGC should be less than 5ms for a normal size heap. maybe your load is too high ...
   Author: 谢良, 2013-02-21, 08:10
答复: Some notes from the HBase developer Pow-Wow - HBase - [mail # dev]
...Yes, i am able to hear the recording as well :)  Regards, Liang ________________________________________ 发件人: Dave Wang [[EMAIL PROTECTED]] 发送时间: 2013年2月21日 0:28 收件人: [EMAIL PROTECTED] ...
   Author: 谢良, 2013-02-21, 01:56
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