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[HBASE-7026] Make metrics collection in StoreScanner.java more efficient - HBase - [issue]
...Per the benchmarks I ran, the following block of code seems to be inefficient:StoreScanner.java:public synchronized boolean next(List<KeyValue> outResult, int limit,    ...
http://issues.apache.org/jira/browse/HBASE-7026    Author: Karthik Ranganathan, 2015-04-08, 22:01
[HBASE-7105] RS throws NPE on forcing compaction from HBase shell on a single bulk imported file. - HBase - [issue]
...In StoreFile, we have:private AtomicBoolean majorCompaction = null;In StoreFile.open(), we do:b = metadataMap.get(MAJOR_COMPACTION_KEY);if (b != null) {  // init majorCompaction va...
http://issues.apache.org/jira/browse/HBASE-7105    Author: Karthik Ranganathan, 2015-03-30, 22:46
[HBASE-6578] Make HDFS block size configurable for HBase WAL - HBase - [issue]
...Right now, because sync-on-block-close is enabled, HLog causes the disk to stall out on large writes (esp when we cross block boundary).We currently use 256MB blocks. The idea is that if we ...
http://issues.apache.org/jira/browse/HBASE-6578    Author: Karthik Ranganathan, 2015-01-10, 02:05
[HBASE-6486] Enhance load test to print throughput measurements - HBase - [issue]
...Idea is to know how many MB/sec of throughput we are able to get by writing into HBase using a simple tool....
http://issues.apache.org/jira/browse/HBASE-6486    Author: Karthik Ranganathan, 2015-01-10, 02:04
[HBASE-4755] HBase based block placement in DFS - HBase - [issue]
...The feature as is only useful for HBase clusters that care about data locality on regionservers, but this feature can also enable a lot of nice features down the road.The basic idea is as fo...
http://issues.apache.org/jira/browse/HBASE-4755    Author: Karthik Ranganathan, 2014-12-22, 09:56
[HBASE-3149] Make flush decisions per column family - HBase - [issue]
...Today, the flush decision is made using the aggregate size of all column families. When large and small column families co-exist, this causes many small flushes of the smaller CF. We need to...
http://issues.apache.org/jira/browse/HBASE-3149    Author: Karthik Ranganathan, 2014-12-02, 18:04
[HBASE-3329] HLog splitting after RS/cluster death should directly create HFiles - HBase - [issue]
...After a RS dies or the cluster goes down and we are recovering, we first split HLogs into the logs for the regions. Then the region servers that host the regions replay the logs and open the...
http://issues.apache.org/jira/browse/HBASE-3329    Author: Karthik Ranganathan, 2014-07-19, 01:37
[HBASE-3156] Special case distributed log splitting on fresh cluster startup - HBase - [issue]
...If the entire HBase goes down (not a graceful stop - example namenode dies) then on a subsequent restart, the HMaster can hand off the hlog splitting to the respective region servers. This w...
http://issues.apache.org/jira/browse/HBASE-3156    Author: Karthik Ranganathan, 2014-07-17, 00:15
[HBASE-3144] Freeze and thaw for regions and/or regionservers - HBase - [issue]
...When frozen, a region would not flush new files or delete old files.Context:Was talking to Dhruba about the possibility of a fast intra-cluster copy, and he says it is totally do-able. The i...
http://issues.apache.org/jira/browse/HBASE-3144    Author: Karthik Ranganathan, 2014-07-17, 00:14
[HBASE-2833] Write a unit test for HBASE-2781 - HBase - [issue]
...Need a test case to verify the fix for HBASE-2781 ZKW.createUnassignedRegion doesn't make sure existing znode is in the right state...
http://issues.apache.org/jira/browse/HBASE-2833    Author: Karthik Ranganathan, 2014-07-16, 23:11
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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