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[HBASE-3457] Auto-tune some GC settings - HBase - [issue]
...The settings we ship with aren't really optimal for an actual deployment. We can take a look at some things like /proc/cpuinfo and figure out whether to enable parallel GC, turn off CMSIncre...
http://issues.apache.org/jira/browse/HBASE-3457    Author: Todd Lipcon, 2013-05-04, 00:37
[HBASE-4324] Single unassigned directory is very slow when there are many unassigned nodes - HBase - [issue]
...Because we use a single znode for /unassigned, and we re-list it every time its contents change, assignment speed per region is O(number of unassigned regions) rather than O(1). Every time s...
http://issues.apache.org/jira/browse/HBASE-4324    Author: Todd Lipcon, 2013-05-03, 20:42
[HBASE-4392] Add metrics for read/write throughput (#cells, #bytes) - HBase - [issue]
...Most of our metrics are currently based on RPC count. This is an inaccurate metric since some RPCs can be much more heavy weight than others. We should maintain our current metrics but also ...
http://issues.apache.org/jira/browse/HBASE-4392    Author: Todd Lipcon, 2013-04-24, 00:51
[HBASE-4246] Cluster with too many regions cannot withstand some master failover scenarios - HBase - [issue]
...We ran into the following sequence of events: master startup failed after only ROOT had been assigned (for another reason) restarted the master without restarting other servers. Since there ...
http://issues.apache.org/jira/browse/HBASE-4246    Author: Todd Lipcon, 2013-04-24, 00:48
[HBASE-4214] Per-region request counters should be clearer about scope - HBase - [issue]
...In testing trunk, I noticed that per-region request counters shown on table.jsp are lifetime-scoped, rather than per-second or some other time range. However, I'm pretty sure they reset when...
http://issues.apache.org/jira/browse/HBASE-4214    Author: Todd Lipcon, 2013-04-24, 00:45
[HBASE-2887] Improvements and refactor for HBaseFsck tool - HBase - [issue]
...Refactored the way the HBaseFsck tool works – it now loads all the info it can find into RAM first, and then looks over the in-memory structures for inconsistencies. It's still a work ...
http://issues.apache.org/jira/browse/HBASE-2887    Author: Todd Lipcon, 2013-04-15, 23:42
Re: Declaring HBase Public API in 0.94 - HBase - [mail # dev]
...The advantage of the annotations is that Tom White already did the work for jdiff to ignore non-public classes over in Hadoop land. We could leverage that work, whether we re-use the o.a.h.c...
   Author: Todd Lipcon, 2013-04-08, 22:55
Re: VOTE: hbase-0.95RC1, the second "Development" Series Release is available [WAS -> VOTE: hbase-0.95.0RC0, the first "Developer Release" release candidate is available for download and vote] - HBase - [mail # dev]
...Shipping the native libs is difficult anyway, because the artifacts will depend on the particular architecture/OS that you compile on. (eg if you compile on Ubuntu 12.04, it'll be useless on...
   Author: Todd Lipcon, 2013-04-03, 17:11
[HBASE-5974] Scanner retry behavior with RPC timeout on next() seems incorrect - HBase - [issue]
...I'm seeing the following behavior: set RPC timeout to a short value call next() for some batch of rows, big enough so the client times out before the result is returned the HConnectionManage...
http://issues.apache.org/jira/browse/HBASE-5974    Author: Todd Lipcon, 2013-02-26, 08:43
[HBASE-2396] Coprocessors: Server side dynamic scripting language execution - HBase - [issue]
...There are a lot of use cases where users want to perform some simple operations on the region server. For example, a row may represent a Set and users want append/search/remove style operati...
http://issues.apache.org/jira/browse/HBASE-2396    Author: Todd Lipcon, 2013-01-17, 19:09
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