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[HBASE-7295] Contention in HBaseClient.getConnection - HBase - [issue]
...HBaseClient.getConnection() synchronizes on the connections object. We found severe contention on a thrift gateway which was fanning out roughly 3000+ calls per second to hbase region server...
http://issues.apache.org/jira/browse/HBASE-7295    Author: Varun Sharma, 2014-02-22, 01:22
Re: Slow Get Performance (or how many disk I/O does it take for one non-cached read?) - HBase - [mail # user]
...Actually there are 2 read aheads in linux (from what I learned last time, Idid benchmarking on random reads). One is the filesystem readahead whichlinux does and then there is also a disk le...
   Author: Varun Sharma, 2014-02-02, 19:03
[expand - 4 more] - Balancer switch runs causing problems - HBase - [mail # user]
...We are seeing one other issue with high read latency (p99 etc.) on one ofour read heavy hbase clusters which is correlated with the balancer runs -every 5 minutes.If there is no balancing to...
   Author: Varun Sharma, 2014-01-28, 03:26
[expand - 6 more] - Sporadic memstore slowness for Read Heavy workloads - HBase - [mail # user]
...Hi,We are seeing some unfortunately low performance in the memstore - we haveresearched some of the previous JIRA(s) and seen some inefficiencies in theConcurrentSkipListMap. The symptom is ...
   Author: Varun Sharma, 2014-01-26, 21:14
[HBASE-7813] Bug in BulkDeleteEndpoint kills entire rows on COLUMN/VERSION Deletes - HBase - [issue]
...Try a BulkDeleteEndpoint using DeleteType.COLUMN or DeleteType.VERSION and give it a set of Columns which are not in the row.A Delete is constructed using just the row alone. No family/colum...
http://issues.apache.org/jira/browse/HBASE-7813    Author: Varun Sharma, 2013-09-20, 06:52
[HBASE-8434] Allow enabling hbase 8354 to support real lease recovery - HBase - [issue]
...Please see discussion in HBase 8389.For environments where lease recovery time can be bounded on the HDFS side through tight timeouts, provide a toggle for users who want the WAL splitting t...
http://issues.apache.org/jira/browse/HBASE-8434    Author: Varun Sharma, 2013-08-03, 00:20
[HBASE-8599] HLogs in ZK are not cleaned up when replication lag is minimal - HBase - [issue]
...On a cluster with very low replication lag (as measured by ageOfLastShippedOp on source), we found HLogs accumulating and not being cleaned up as new WAL(s) are rolled.Each time, we call log...
http://issues.apache.org/jira/browse/HBASE-8599    Author: Varun Sharma, 2013-07-24, 20:08
[HBASE-8815] A replicated cross cluster client - HBase - [issue]
...I would like to float this idea for brain storming.HBase is a strongly consistent system modelled after bigtable which means a machine going down results in loss of availability of around 2 ...
http://issues.apache.org/jira/browse/HBASE-8815    Author: Varun Sharma, 2013-06-28, 04:47
[HBASE-8813] Fix time b/w recoverLease invocations from HBASE 8449 - HBase - [issue]
...The time b/w recover lease attempts is conservative but is still not correct. It does not factor in Datanode heartbeat time intervals....
http://issues.apache.org/jira/browse/HBASE-8813    Author: Varun Sharma, 2013-06-28, 02:08
[HBASE-8554] Scan should seek to startRow within a region - HBase - [issue]
...Currently Scan.startRow() is only used for determining which Region to look up the row into but we do not seek within the region to the start row. Since its not uncommon to run with large si...
http://issues.apache.org/jira/browse/HBASE-8554    Author: Varun Sharma, 2013-05-16, 05:28
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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