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[HBASE-5002] Control replication peer per column family. - HBase - [issue]
...With HBASE-2196 in place. Would be nice if we could control per CF to which peer(s) it is replicated.Could have a new option REPLICATION_PEERS, which holds a , separated list of replication ...
http://issues.apache.org/jira/browse/HBASE-5002    Author: Lars Hofhansl, 2013-12-08, 04:43
[HBASE-5164] Better HTable resource consumption in CoprocessorHost - HBase - [issue]
...HBASE-4805 allows for more control over HTable's resource consumption.This is currently not used by CoprocessorHost (even though it would even be more critical to control this inside the Reg...
http://issues.apache.org/jira/browse/HBASE-5164    Author: Lars Hofhansl, 2013-12-08, 04:41
[HBASE-7347] Allow multiple readers per storefile - HBase - [issue]
...Currently each store file is read only through the single reader regardless of how many concurrent read requests access that file.This issue is to explore alternate designs....
http://issues.apache.org/jira/browse/HBASE-7347    Author: Lars Hofhansl, 2013-12-08, 02:01
[HBASE-6476] Replace all occurrances of System.currentTimeMillis() with EnvironmentEdge equivalent - HBase - [issue]
...There are still some areas where System.currentTimeMillis() is used in HBase. In order to make all parts of the code base testable and (potentially) to be able to configure HBase's notion of...
http://issues.apache.org/jira/browse/HBASE-6476    Author: Lars Hofhansl, 2013-12-08, 01:37
[HBASE-9553] Pad HFile blocks to a fixed size before placing them into the blockcache - HBase - [issue]
...In order to make it easy on the garbage collector and to avoid full compaction phases we should make sure that all (or at least a large percentage) of the HFile blocks as cached in the block...
http://issues.apache.org/jira/browse/HBASE-9553    Author: Lars Hofhansl, 2013-12-08, 01:36
[HBASE-9840] Large scans and BlockCache evictions problems - HBase - [issue]
...I just ran into a scenario that baffled me first, but after some reflection makes sense. I ran a very large scan that filled up most of the block cache with my scan's data. I ran that scan a...
http://issues.apache.org/jira/browse/HBASE-9840    Author: Lars Hofhansl, 2013-12-03, 21:31
[HBASE-9915] Performance: isSeeked() in EncodedScannerV2 always returns false - HBase - [issue]
...While debugging why reseek is so slow I found that it is quite broken for encoded scanners.The problem is this:AbstractScannerV2.reseekTo(...) calls isSeeked() to check whether scanner was s...
http://issues.apache.org/jira/browse/HBASE-9915    Author: Lars Hofhansl, 2013-11-30, 03:11
[HBASE-7141] Cleanup Increment and Append issues - HBase - [issue]
...Append and Increment should take a TS for their update phase Append should access a timerange for the read phase Increment should no longer implement Writable (in trunk) Increment and Append...
http://issues.apache.org/jira/browse/HBASE-7141    Author: Lars Hofhansl, 2013-11-27, 23:35
[HBASE-10015] Replace intrinsic locking with explicit locks in StoreScanner - HBase - [issue]
...Did some more profiling (this time with a sampling profiler) and StoreScanner.peek() showed up a lot in the samples. At first that was surprising, but peek is synchronized, so it seems a lot...
http://issues.apache.org/jira/browse/HBASE-10015    Author: Lars Hofhansl, 2013-11-27, 21:42
[HBASE-9956] Remove keyLength cache from KeyValue - HBase - [issue]
...See discussion in HBASE-9935. Currently KeyValue caches the keyLength in order to avoid decoding the key length in getKeyLength() repeatedly.Benchmarking outside of a profiler revealed no im...
http://issues.apache.org/jira/browse/HBASE-9956    Author: Lars Hofhansl, 2013-11-26, 05:53
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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