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[expand - 1 more] - Re: On coprocessor API evolution - HBase - [mail # dev]
...On Wed, May 21, 2014 at 5:16 AM, Michael Segel wrote:I wasn't arguing for or against coprocessors being out of process. I thinkboth sides of this "argument" are in fact in agreement: if you ...
   Author: Todd Lipcon, 2014-05-21, 17:50
[HBASE-2663] LRU cache makes needless datastructure copies during eviction - HBase - [issue]
...Was browsing the LRU eviction code and came upon some very inefficient code. When we do eviction, BlockBucket.free() calls queue.get() which first inserts everything from the PriorityQueue&l...
http://issues.apache.org/jira/browse/HBASE-2663    Author: Todd Lipcon, 2014-05-20, 01:19
Re: [VOTE] The 1st HBase 0.98.2 release candidate (RC0) is available - HBase - [mail # dev]
...Hey Andrew,Sorry for the late email here, but -- I believe releases need at leastthree +1 votes from PMC members[1]. Perhaps people were a bit busy lastweek due to HBaseCon and we should ext...
   Author: Todd Lipcon, 2014-05-12, 14:45
[HBASE-2597] Use "Builder" pattern instead of many-argument constructors - HBase - [issue]
...We've got a lot of objects that have a ton of different constructors with a huge number of parameters. Whenever we add a new parameter, existing callers break, and it's sometimes difficult t...
http://issues.apache.org/jira/browse/HBASE-2597    Author: Todd Lipcon, 2014-05-12, 01:39
[expand - 1 more] - Re: Behavior change in Access Controller between 0.94 and 0.98 - HBase - [mail # dev]
...On Thu, Apr 24, 2014 at 10:13 AM, Andrew Purtell wrote:In certain cases... (see below)AFAIK most commercial databases don't offer the "hidden visibility" accesscontrol differently than "acce...
   Author: Todd Lipcon, 2014-04-24, 17:22
[HBASE-4391] Add ability to start RS as root and call mlockall - HBase - [issue]
...A common issue we've seen in practice is that users oversubscribe their region servers with too many MR tasks, etc. As soon as the machine starts swapping, the RS grinds to a halt, loses ZK ...
http://issues.apache.org/jira/browse/HBASE-4391    Author: Todd Lipcon, 2014-04-24, 16:56
[expand - 1 more] - Re: blockcache 101 - HBase - [mail # dev]
...On Wed, Apr 9, 2014 at 10:24 AM, Nick Dimiduk  wrote:Was referring to these graphs:http://www.n10k.com/assets/perfeval_blockcache_v2.pdfAnd yep, I think straight lines between the point...
   Author: Todd Lipcon, 2014-04-15, 05:13
[expand - 1 more] - Re: HBase region server failure issues - HBase - [mail # dev]
...On Mon, Apr 14, 2014 at 6:32 PM, Vladimir Rodionovwrote:I'd actually disagree. 100 is probably significantly faster than 1, giventhat most machines have 12 spindles. So, yes, you'd be multip...
   Author: Todd Lipcon, 2014-04-15, 03:22
[HBASE-4012] Further optimize byte comparison methods - HBase - [issue]
...Guava uses some clever tricks with sun.misc.Unsafe to compare byte arrays about 100% faster than the naive byte-by-byte implementation: http://guava-libraries.googlecode.com/svn/trunk/guava/...
http://issues.apache.org/jira/browse/HBASE-4012    Author: Todd Lipcon, 2014-03-17, 21:14
[HBASE-3484] Replace memstore's ConcurrentSkipListMap with our own implementation - HBase - [issue]
...By copy-pasting ConcurrentSkipListMap into HBase we can make two improvements to it for our use case in MemStore: add an iterator.replace() method which should allow us to do upsert much mor...
http://issues.apache.org/jira/browse/HBASE-3484    Author: Todd Lipcon, 2014-03-10, 15:35
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB