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Re: HBase - stable versions - HBase - [mail # dev]
...We, at Pinterest, are also going to stay on 0.94 for a while since it has worked well for us and we don't have the resources to test 0.96 in the EC2 environment. That may change in the futur...
   Author: Varun Sharma, 2013-09-04, 23:29
[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
[expand - 2 more] - Re: Excessive .META scans - HBase - [mail # user]
...Just patched 6870 and it immediately fixed the problem !   On Tue, Jul 30, 2013 at 12:57 PM, Stack  wrote:  ...
   Author: Varun Sharma, 2013-08-01, 23:02
Re: HBase read perfomnance and HBase client - HBase - [mail # dev]
...Last time around, we found that block checksums was #1 (but then if we are serving from block cache, it should not matter) and binarysearch into indices was also high in terms of CPU.  ...
   Author: Varun Sharma, 2013-08-01, 06:37
[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
Re: EC2 instance type recommendation ? - HBase - [mail # user]
...We have both c1.xlarge and hi1.4xlarge clusters at Pinterest. We have used the following guidelines:  1) hi1.4xlarge - small data sets, random read heavy and IOPs bound - very expensive...
   Author: Varun Sharma, 2013-07-16, 19:08
Re: GC recommendations for large Region Server heaps - HBase - [mail # user]
...Hi Suraj,  One thing I have observed is that if you very high block cache churn which happens in a ready heavy workload - a full GC eventually happens because more block cache blocks bl...
   Author: Varun Sharma, 2013-07-10, 03:20
Re: optimizing block cache requests + eviction - HBase - [mail # user]
...FYI, if u disable your block cache - you will ask for "Index" blocks for every single request. So such a high rate of request is plausible for Index blocks even when your requests are totall...
   Author: Varun Sharma, 2013-07-08, 23:50
[expand - 4 more] - Re: Puzzling behaviour with HBase checksums - HBase - [mail # dev]
...Created https://issues.apache.org/jira/browse/HDFS-4960.  Thanks !   On Sat, Jul 6, 2013 at 3:55 PM, Stack  wrote:  ...
   Author: Varun Sharma, 2013-07-07, 16:38
[expand - 5 more] - Re: Poor HBase random read performance - HBase - [mail # dev]
...Going back to leveldb vs hbase, I am not sure if we can come with a clean way to identify HFiles containing more recent data in the wake of compactions  I though wonder if this works wi...
   Author: Varun Sharma, 2013-07-01, 23:10
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