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Re: large heaps - HBase - [mail # dev]
...Hey Nicolas,  I've corresponded with that guy a few times in the past -- back when i was attempting to hack some patches into G1 for better performance on HBase. The end result of that ...
   Author: Todd Lipcon, 2013-06-13, 05:30
Re: Nifty code summaries. - HBase - [mail # dev]
...interesting, my sloccount program shows about half of that: SLOC    Directory       SLOC-by-Language (Sorted) 199611  hbase-server    java=193938,ruby...
   Author: Todd Lipcon, 2013-06-05, 17:29
[HBASE-2231] Compaction events should be written to HLog - HBase - [issue]
...The sequence for a compaction should look like this: Compact region to "new" files Write a "Compacted Region" entry to the HLog Delete "old" filesThis deals with a case where the RS has paus...
http://issues.apache.org/jira/browse/HBASE-2231    Author: Todd Lipcon, 2013-05-24, 10:29
[HBASE-2332] Remove client-exposed row locks from region server - HBase - [issue]
...Discussion in HBASE-2294 has surfaced that the client-exposed row lock feature in the HBase API may not be scalable/necessary. Additionally there are some benefits we can reap by removing th...
http://issues.apache.org/jira/browse/HBASE-2332    Author: Todd Lipcon, 2013-05-14, 03:22
[HBASE-5912] org.apache.hadoop.hbase.ipc.ProtocolSignature.getFingerprint takes significant CPU - HBase - [issue]
...I ran oprofile on a YCSB client and found that a large percentage of the CPU time was going to this function:51991     0.4913  25361.jo           &nbs...
http://issues.apache.org/jira/browse/HBASE-5912    Author: Todd Lipcon, 2013-05-05, 00:40
[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
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