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Anoop Sam John
Stephen Yuan Jiang
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[HBASE-4392] Add metrics for read/write throughput (#cells, #bytes)
...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 ...
, 2013-04-24, 00:51
[HBASE-4246] Cluster with too many regions cannot withstand some master failover scenarios
...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 ...
, 2013-04-24, 00:48
[HBASE-4214] Per-region request counters should be clearer about scope
...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...
, 2013-04-24, 00:45
[HBASE-2887] Improvements and refactor for HBaseFsck tool
...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 ...
, 2013-04-15, 23:42
[HBASE-5974] Scanner retry behavior with RPC timeout on next() seems incorrect
...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...
, 2013-02-26, 08:43
[HBASE-2730] Expose RS work queue contents on web UI
...Would be nice to be able to see the contents of the various work queues - eg to know what regions are pending compaction/split/flush/etc. This is handy for debugging why a region might be bl...
, 2013-01-15, 22:23
[HBASE-5448] Support for dynamic coprocessor endpoints with PB-based RPC
, 2012-12-20, 20:08
[HBASE-5898] Consider double-checked locking for block cache lock
...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 ...
, 2012-12-13, 22:20
[HBASE-3835] Switch web pages to Jamon template engine instead of JSP
...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...
, 2012-11-02, 17:57
[HBASE-2629] Piggyback basic "alarm" framework on RS heartbeats
...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...
, 2012-10-31, 00:30
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