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[HBASE-12173] Backport: [PE] Allow random value size - HBase - [issue]
...Looked at it briefly. Didn't have time to fix up the patch.Actually, removing this from 0.94....
http://issues.apache.org/jira/browse/HBASE-12173    Author: Lars Hofhansl, 2015-01-05, 06:01
[HBASE-12765] SplitTransaction creates too many threads (potentially) - HBase - [issue]
...In splitStoreFiles(...) we create a new thread pool with as many threads as there are files to split.We should be able to do better. During times of very heavy write loads there might be a l...
http://issues.apache.org/jira/browse/HBASE-12765    Author: Lars Hofhansl, 2014-12-29, 23:57
[HBASE-12457] Regions in transition for a long time when CLOSE interleaves with a slow compaction - HBase - [issue]
...Under heave load we have observed regions remaining in transition for 20 minutes when the master requests a close while a slow compaction is running.The pattern is always something like this...
http://issues.apache.org/jira/browse/HBASE-12457    Author: Lars Hofhansl, 2014-12-09, 22:58
[HBASE-12545] Fix backwards compatibility issue introduced with HBASE-12363 - HBase - [issue]
http://issues.apache.org/jira/browse/HBASE-12545    Author: Lars Hofhansl, 2014-12-04, 18:16
[HBASE-12621] Explain in the book when KEEP_DELETED_CELLS is useful - HBase - [issue]
...KEEP_DELETED_CELLS seems to be very confusing.The books need further clarification when this setting is useful and what the implications are.(and maybe we should discuss if there's a simpler...
http://issues.apache.org/jira/browse/HBASE-12621    Author: Lars Hofhansl, 2014-12-03, 06:46
[HBASE-12146] RegionServerTracker should escape data in log messages - HBase - [issue]
...Trivial thing I observed when testing 0.94.24RC2.I see a log message of the form:2014-10-01 13:52:35,632 INFO org.apache.hadoop.hbase.zookeeper.RegionServerTracker: Rs node: /hbase/rs/newbun...
http://issues.apache.org/jira/browse/HBASE-12146    Author: Lars Hofhansl, 2014-11-29, 22:31
[HBASE-9731] updatesBlockedSeconds RegionServer metric should not be a histogram - HBase - [issue]
...I just noticed that updatesBlockedSeconds is declared as a histogram (in 0.94), which makes little sense (neither mean, nor any percentiles are useful, as it is an every increasing number).T...
http://issues.apache.org/jira/browse/HBASE-9731    Author: Lars Hofhansl, 2014-11-23, 01:37
[HBASE-6974] Metric for blocked updates - HBase - [issue]
...When the disc subsystem cannot keep up with a sustained high write load, a region will eventually block updates to throttle clients.(HRegion.checkResources).It would be nice to have a metric...
http://issues.apache.org/jira/browse/HBASE-6974    Author: Lars Hofhansl, 2014-11-23, 01:37
[HBASE-12363] Improve how KEEP_DELETED_CELLS works with MIN_VERSIONS - HBase - [issue]
...Brainstorming...This morning in the train (of all places) I realized a fundamental issue in how KEEP_DELETED_CELLS is implemented.The problem is around knowing when it is safe to remove a de...
http://issues.apache.org/jira/browse/HBASE-12363    Author: Lars Hofhansl, 2014-11-20, 23:13
[HBASE-7336] HFileBlock.readAtOffset does not work well with multiple threads - HBase - [issue]
...HBase grinds to a halt when many threads scan along the same set of blocks and neither read short circuit is nor block caching is enabled for the dfs client ... disabling the block cache mak...
http://issues.apache.org/jira/browse/HBASE-7336    Author: Lars Hofhansl, 2014-11-16, 19:44
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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