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[HBASE-4306] Race between CatalogJanitor and LoadBalancer - HBase - [issue]
...It is possible for the LoadBalancer to try to assign an offline/split region while it is waiting to be CatalogJanitor'ed. It goes like this:2011-08-25 00:32:07,137 INFO org.apache.hadoop.hba...
http://issues.apache.org/jira/browse/HBASE-4306    Author: Jean-Daniel Cryans, 2014-12-24, 19:50
[HBASE-5162] Basic client pushback mechanism - HBase - [issue]
...The current blocking we do when we are close to some limits (memstores over the multiplier factor, too many store files, global memstore memory) is bad, too coarse and confusing. After hitti...
http://issues.apache.org/jira/browse/HBASE-5162    Author: Jean-Daniel Cryans, 2014-12-19, 19:58
[expand - 3 more] - Re: Questions about HBase replication - HBase - [mail # dev]
...To add to what Jieshan said:On Fri, Nov 21, 2014 at 8:32 PM, Cliff  wrote:If you were to use HTable from the source:- All your meta lookups would be a lot slower than if you were local....
   Author: Jean-Daniel Cryans, 2014-12-16, 16:34
[HBASE-8275] Tool to test binary compatibility - HBase - [issue]
...Stack and I were discussing of ways to make binary compatibility easier to test than doing it completely by hand.One idea would be to have a tool that uses reflection to generate code that c...
http://issues.apache.org/jira/browse/HBASE-8275    Author: Jean-Daniel Cryans, 2014-12-12, 02:53
Re: Replication terminology "master-master" - HBase - [mail # dev]
...On Mon, Nov 24, 2014 at 8:29 PM, lars hofhansl  wrote:I agree with that.One thing about "master-master" is that some audiences will get it rightaway, for example folks coming from the M...
   Author: Jean-Daniel Cryans, 2014-11-25, 16:09
[HBASE-3206] Detect slow GC loops of death - HBase - [issue]
...Something that has been bothering me for a while was to understand when a region server was being slow because of frequent and small GC pauses. I usually go into that RS's GC output, watch i...
http://issues.apache.org/jira/browse/HBASE-3206    Author: Jean-Daniel Cryans, 2014-08-12, 20:12
[HBASE-5349] Automagically tweak global memstore and block cache sizes based on workload - HBase - [issue]
...Hypertable does a neat thing where it changes the size given to the CellCache (our MemStores) and Block Cache based on the workload. If you need an image, scroll down at the bottom of this l...
http://issues.apache.org/jira/browse/HBASE-5349    Author: Jean-Daniel Cryans, 2014-08-08, 19:05
[HBASE-10518] DirectMemoryUtils.getDirectMemoryUsage spams when none is configured - HBase - [issue]
...My logs are full of "Failed to retrieve nio.BufferPool direct MemoryUsed". Even if it's DEBUG, it adds no value. It'd just remove....
http://issues.apache.org/jira/browse/HBASE-10518    Author: Jean-Daniel Cryans, 2014-07-22, 09:44
[HBASE-2328] Make important configurations more obvious to new users - HBase - [issue]
...Over the last 2 weeks, I encountered many situations where people didn't set file descriptors and xcievers higher and that was causing a ton of problems that are hard to debug if you're not ...
http://issues.apache.org/jira/browse/HBASE-2328    Author: Jean-Daniel Cryans, 2014-07-02, 02:25
Re: jdk 1.7 & trunk - HBase - [mail # dev]
...On Wed, Jun 25, 2014 at 11:48 AM, Nicolas Liochon  wrote:That's an easy -1, it would mean that you'd need to upgrade Java in orderto get HBase bug fixes :) ...
   Author: Jean-Daniel Cryans, 2014-06-25, 18:54
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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