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From Enis Söztutar <e...@apache.org>
Subject Re: Comparing the performance of 0.98.4 RC0 and 0.98.0 using YCSB - 23% perf regression in workload E
Date Fri, 18 Jul 2014 00:16:50 GMT
Sorry, just saw your vote on RC now.


On Thu, Jul 17, 2014 at 5:16 PM, Enis Söztutar <enis@apache.org> wrote:

> This looks indeed concerning. It seems that Workload E is 95% scan, and
> the other workloads have no scan, so it seems that we have some regression
> in scans.
>
> Should this sink the RC, what do you think?
>
> Enis
>
>
> On Thu, Jul 17, 2014 at 5:08 PM, Andrew Purtell <apurtell@apache.org>
> wrote:
>
>> Comparing the relative performance of 0.98.4 RC0 and 0.98.0 on Hadoop
>> 2.2.0
>> using YCSB.
>>
>> This will be the last report of these from me for a while, as I will be
>> losing my current access to EC2 resources tomorrow.
>>
>> 5 concurrent YCSB clients on 5 servers target 100,000 ops/second in
>> aggregate. Reported average values are averages of readings from all
>> clients over 3 runs. Min values are the minimum reported by any client on
>> any run. Max and percentile values are the maximum reported by any client
>> on any run. What is interesting is relative differences, because each EC2
>> testbed has a varying baseline. 0.98.0 and 0.98.4 tests were run on the
>> same instance set.
>>
>> These tests were run with no security coprocessors installed, using HFile
>> V2. The workload E results are a concern. *It appears we have a 23%
>> decline
>> in measured scan throughput and an 23% increase in average op time from 27
>> ms to 35 ms. *This does not correspond to any active security feature
>> (though that could worsen results potentially, untested) so is something
>> changed in core code. Other workloads are not affected so this is
>> something
>> specific to scanning. Perhaps delete tracking.
>>
>>
>> *Hardware and Versions*
>>
>>  Hadoop 2.2.0
>>
>> HBase 0.98.0-hadoop2 + HBASE-11277
>>
>> HBase 0.98.4-hadoop2 RC0
>>
>> YCSB 1.0.4
>>
>>
>> 11x EC2 c3.8xlarge: 1 master, 5 slaves, 5 test clients
>>
>>     32 cores
>>
>>      60 GB RAM
>>
>>     2 x 320 GB directly attached SSD
>>
>>     NameNode: 4 GB heap
>>
>>     DataNode: 1 GB heap
>>
>>     Master: 1 GB heap
>>
>>     RegionServer: 8 GB heap, 24 GB bucket cache offheap engine
>>
>>
>> *Methodology*
>>
>>
>> Setup:
>>
>>      0. Start cluster
>>      1. shell: create "seed", { NAME=>"u", COMPRESSION=>"snappy" }
>>      2. YCSB: Preload 100 million rows into table "seed"
>>      3. shell: flush "seed" ; compact "seed"
>>      4. Wait for compaction to complete
>>      5. shell: create_snapshot "seed", "seed_snap"
>>      6. shell: disable "seed"
>>
>>
>>  For each test:
>>
>>      7. shell: clone_snapshot "seed_snap", "test"
>>      8. YCSB: On each client (5 clients), run test -p
>> operationcount=2000000 -threads 20 -target 20000
>>      9. shell: disable "test"
>>     10. shell: drop "test"
>>
>> ​
>>
>>    *Workload A*
>> *0.98.0* *0.98.4*
>>
>>
>>
>>  [OVERALL] RunTime(ms) 100743 100693  [OVERALL] Throughput(ops/sec) 99263
>> 99312  [UPDATE] Operations 4997918 4999620  [UPDATE] AverageLatency(us)
>> 633
>> 647  [UPDATE] MinLatency(us) 269 268  [UPDATE] MaxLatency(us) 1450432
>> 713191
>> [UPDATE] 95thPercentileLatency(ms) 0 0  [UPDATE]
>> 99thPercentileLatency(ms) 5
>> 4  [READ] Operations 5002242 5000540  [READ] AverageLatency(us) 151 144
>> [READ] MinLatency(us) 0 0  [READ] MaxLatency(us) 1104157 952392  [READ]
>> 95thPercentileLatency(ms) 0 0  [READ] 99thPercentileLatency(ms) 0 0
>>
>>
>>
>>  *Workload B*
>>
>>
>>
>>
>>
>>
>>  [OVERALL] RunTime(ms) 100465 100458  [OVERALL] Throughput(ops/sec) 99537
>> 99544  [UPDATE] Operations 9499627 9499891  [UPDATE] AverageLatency(us)
>> 556
>> 589  [UPDATE] MinLatency(us) 268 264  [UPDATE] MaxLatency(us) 709604
>> 695863
>> [UPDATE] 95thPercentileLatency(ms) 0 0  [UPDATE]
>> 99thPercentileLatency(ms) 1
>> 2  [READ] Operations 500533 500269  [READ] AverageLatency(us) 147 144
>> [READ] MinLatency(us) 0 0  [READ] MaxLatency(us) 571294 495148  [READ]
>> 95thPercentileLatency(ms) 0 0  [READ] 99thPercentileLatency(ms) 0 0
>>
>>
>>
>>  *Workload C*
>>
>>
>>
>>
>>
>>
>>  [OVERALL] RunTime(ms) 100091 100022  [OVERALL] Throughput(ops/sec) 99909
>> 99978  [READ] Operations 9916831 10000000  [READ] AverageLatency(us) 524
>> 526
>> [READ] MinLatency(us) 273 269  [READ] MaxLatency(us) 737108 741634  [READ]
>> 95thPercentileLatency(ms) 0 0  [READ] 99thPercentileLatency(ms) 1 2
>>
>>
>>
>>  *Workload D*
>>
>>
>>
>>
>>
>>
>>  [OVERALL] RunTime(ms) 114244 103308  [OVERALL] Throughput(ops/sec) 89114
>> 96809  [INSERT] Operations 9499965 9500306  [INSERT] AverageLatency(us)
>> 1145
>> 668  [INSERT] MinLatency(us) 270 271  [INSERT] MaxLatency(us) 4598999
>> 3291540  [INSERT] 95thPercentileLatency(ms) 6 1  [INSERT]
>> 99thPercentileLatency(ms) 13 3  [READ] Operations 500035 499694  [READ]
>> AverageLatency(us) 14 15  [READ] MinLatency(us) 4 4  [READ] MaxLatency(us)
>> 494730 495198  [READ] 95thPercentileLatency(ms) 0 0  [READ]
>> 99thPercentileLatency(ms) 0 0
>>
>>
>>
>>  *Workload E*
>>
>>
>>
>>
>>
>>
>>  [OVERALL] RunTime(ms) 1600910 2078826  [OVERALL] Throughput(ops/sec) 6308
>> 4835  [INSERT] Operations 499131 500322  [INSERT] AverageLatency(us) 14 17
>> [INSERT] MinLatency(us) 5 5  [INSERT] MaxLatency(us) 506079 564468
>>  [INSERT]
>> 95thPercentileLatency(ms) 0 0  [INSERT] 99thPercentileLatency(ms) 0 0
>> [SCAN] Operations 9500869 9499678  [SCAN] AverageLatency(us)
>> ​​
>> ​​
>> 26636 34620  [SCAN] MinLatency(us) 746 755  [SCAN] MaxLatency(us) 8067864
>> 4615914  [SCAN] 95thPercentileLatency(ms) 117 136  [SCAN]
>> 99thPercentileLatency(ms) 169 187
>>
>>
>>
>>  *Workload F*
>>
>>
>>
>>
>>
>>
>>  [OVERALL] RunTime(ms) 100876 100820  [OVERALL] Throughput(ops/sec) 99133
>> 99187  [UPDATE] Operations 10000000 10000000  [UPDATE] AverageLatency(us)
>> 737 746  [UPDATE] MinLatency(us) 273 272  [UPDATE] MaxLatency(us) 759812
>> 747124  [UPDATE] 95thPercentileLatency(ms) 1 1  [UPDATE]
>> 99thPercentileLatency(ms) 5 6  [READ-MODIFY-WRITE] Operations 5000370
>> 5000082  [READ-MODIFY-WRITE] AverageLatency(us) 742 750
>>  [READ-MODIFY-WRITE]
>> MinLatency(us) 280 279  [READ-MODIFY-WRITE] MaxLatency(us) 756180 747197
>> [READ-MODIFY-WRITE] 95thPercentileLatency(ms) 1 1  [READ-MODIFY-WRITE]
>> 99thPercentileLatency(ms) 5 6  [READ] Operations 5000530 5000242  [READ]
>> AverageLatency(us) 22 17  [READ] MinLatency(us) 0 0  [READ] MaxLatency(us)
>> 1551953 1097394  [READ] 95thPercentileLatency(ms) 0 0  [READ]
>> 99thPercentileLatency(ms) 0 0
>> ​
>>
>> ​​
>> --
>> Best regards,
>>
>>    - Andy
>>
>> Problems worthy of attack prove their worth by hitting back. - Piet Hein
>> (via Tom White)
>>
>
>

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