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[HBASE-5898] Consider double-checked locking for block cache lock - HBase - [issue]
...Running a workload with a high query rate against a dataset that fits in cache, I saw a lot of CPU being used in IdLock.getLockEntry, being called by HFileReaderV2.readBlock. Even though it ...
http://issues.apache.org/jira/browse/HBASE-5898    Author: Todd Lipcon, 2012-12-13, 22:20
Unstuck QA bot - HBase - [mail # dev]
...The QA bot was previously pointing at a JIRA filter which matched all Patch Available issues. That number has grown to >300 across the many projects that the QA bot works on. Unfortunatel...
   Author: Todd Lipcon, 2012-12-13, 02:34
Re: [DISCUSSION] Policy proposal for JIRAs opened for unit test failures without patches attached - HBase - [mail # dev]
...I actually disagree -- jenkins doesn't maintain old logs forever. So, if you open a JIRA for a failing test, please do attach the log of the failing test, and hopefully the particular revisi...
   Author: Todd Lipcon, 2012-11-08, 00:32
[HBASE-3835] Switch web pages to Jamon template engine instead of JSP - HBase - [issue]
...Jamon (http://jamon.org) is a template engine that I think is preferable to JSP. You can read an interview with some comparisons vs JSP here: http://www.artima.com/lejava/articles/jamon.html...
http://issues.apache.org/jira/browse/HBASE-3835    Author: Todd Lipcon, 2012-11-02, 17:57
[HBASE-2629] Piggyback basic "alarm" framework on RS heartbeats - HBase - [issue]
...There are a number of system conditions that can cause HBase to perform badly or have stability issues. For example, significant swapping activity or overloaded ZK will result in all kinds o...
http://issues.apache.org/jira/browse/HBASE-2629    Author: Todd Lipcon, 2012-10-31, 00:30
[HBASE-2444] LeaseStillHeldException is overloaded for other meanings in RS management - HBase - [issue]
...If a region server that has already been declared dead reports to the master, the master throws LeaseStillHeldException. This is not a very descriptive exception for this case - we should ei...
http://issues.apache.org/jira/browse/HBASE-2444    Author: Todd Lipcon, 2012-10-31, 00:29
[HBASE-2363] Add configuration for tunable dataloss sensitivity - HBase - [issue]
...There are many cases in HBase when the process detects that some data is "not quite right". We often have two choices: (a) throw up our hands and exit, or (b) log a warning and push through ...
http://issues.apache.org/jira/browse/HBASE-2363    Author: Todd Lipcon, 2012-10-31, 00:27
[HBASE-2342] Consider adding a watchdog node next to region server - HBase - [issue]
...This idea has been bandied about a fair amount. The concept is to add a second java process that runs next to each region server to act as a watchdog. Several possible purposes: monitor the ...
http://issues.apache.org/jira/browse/HBASE-2342    Author: Todd Lipcon, 2012-10-30, 22:20
[HBASE-4254] Get tests passing on Hadoop 23 - HBase - [issue]
...Currently some 30 or so tests are failing on the "HBase-trunk-on-hadoop-23" build. It looks like most are reflection-based issues....
http://issues.apache.org/jira/browse/HBASE-4254    Author: Todd Lipcon, 2012-10-30, 22:01
[HBASE-3411] manually compact memstores? - HBase - [issue]
...I have a theory and some experiments that indicate our heap fragmentation issues has to do with the KV buffers from memstores ending up entirely interleaved in the old gen. I had a bit of wi...
http://issues.apache.org/jira/browse/HBASE-3411    Author: Todd Lipcon, 2012-10-30, 21:23
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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