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https://issues.apache.org/jira/browse/HBASE-15619?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15232660#comment-15232660
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Yu Li commented on HBASE-15619:
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Thanks for the hint [~vrodionov]. Have you done any comparison between 2.0 and
0.98 also? Are hot spots observed in HBASE-15540 only for branch-1/2.0, or
maybe existing issues all along?
> Performance regression observed: Random read(get) performance of branch-1
> worse than 0.98
> -----------------------------------------------------------------------------------------
>
> Key: HBASE-15619
> URL: https://issues.apache.org/jira/browse/HBASE-15619
> Project: HBase
> Issue Type: Bug
> Reporter: Yu Li
> Assignee: Yu Li
>
> As titled, I observed the perf regression in the final stress testing before
> upgrading our online cluster to 1.x. More details as follows:
> 1. HBase version in the comparison test:
> * 0.98: based on 0.98.12 with some backports, among which HBASE-11297 is
> the most important perf-related one (especially under high stress)
> * 1.x: checked 3 releases in total
> 1) 1.1.2 with important perf fixes/improvements including HBASE-15031
> and HBASE-14465 (we planed to upgrade to 1.x since Oct. last year, by when
> 1.1.2 was the latest stable release in branch-1)
> 2) 1.1.4 release
> 3) 1.2.1RC1
> 2. Test environment
> * YCSB: 0.7.0 with
> [YCSB-651|https://github.com/brianfrankcooper/YCSB/pull/651] applied
> * Client: 4 physical nodes, each with 8 YCSB instance, each instance with
> 100 threads
> * Server: 1 Master with 3 RS, each RS with 256 handlers and 64G heap
> * Hardware: 64-core CPU, 256GB Mem, 10Gb Net, 1 PCIe-SSD and 11 HDD, same
> hardware for client and server
> 3. Test cases
> * -p fieldcount=1 -p fieldlength=128 -p readproportion=1
> * case #1: read against empty table
> * case #2: lrucache 100% hit
> * case #3: BLOCKCACHE=>false
> 4. Test result
> * 1.1.4 and 1.2.1 have a similar perf (less than 2% deviation) as 1.1.2+, so
> will only paste comparison data of 0.98.12+ and 1.1.2+
> * per-RS Throughput(ops/s)
> ||HBaseVersion||case#1||case#2||case#3||
> |0.98.12+|383562|257493|47594|
> |1.1.2+|363050|232757|35872|
> * AverageLatency(us)
> ||HBaseVersion||case#1||case#2||case#3||
> |0.98.12+|2774|4134|22371|
> |1.1.2+|2930|4572|29690|
> It seems to me each part on the read path has perf regression: RPCServer for
> case#1, lrucache read for case#2, and hfile read for case#3...
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