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From Stephan Erb <s...@apache.org>
Subject Re: Review Request 52669: Move the H2 database off heap.
Date Tue, 11 Oct 2016 18:17:17 GMT

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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/52669/
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(Updated Oct. 11, 2016, 8:17 p.m.)


Review request for Aurora, David McLaughlin, John Sirois, and Zameer Manji.


Changes
-------

Rebased.


Repository: aurora


Description
-------

This experiment is inspired by David's comment: "I don’t think the
storage engine matters. We just need to be able to offload it from
the Scheduler JVM. The problem with H2 isn’t SQL or anything else,
it’s the GC pressure."

Basic idea is to switch to another storage backend: "nioMemFS stores
data outside of the VM's heap - useful for large memory DBs without
incurring GC costs" (http://www.h2database.com/html/advanced.html)

Our micro-benchmarks look promising

Current Master (on-heap db with latest versions):

TaskStoreBenchmarks.DBFetchTasksBenchmark.run                         N/A          N/A   
     N/A       10000  thrpt    5  72851.249 ± 15794.210  ops/s
TaskStoreBenchmarks.DBFetchTasksBenchmark.run                         N/A          N/A   
     N/A       50000  thrpt    5  31626.929 ± 17326.988  ops/s
TaskStoreBenchmarks.DBFetchTasksBenchmark.run                         N/A          N/A   
     N/A      100000  thrpt    5      0.078 ±     0.013  ops/s
TaskStoreBenchmarks.MemFetchTasksBenchmark.run                        N/A          N/A   
     N/A       10000  thrpt    5    414.135 ±   315.838  ops/s
TaskStoreBenchmarks.MemFetchTasksBenchmark.run                        N/A          N/A   
     N/A       50000  thrpt    5     68.643 ±    24.303  ops/s
TaskStoreBenchmarks.MemFetchTasksBenchmark.run                        N/A          N/A   
     N/A      100000  thrpt    5     32.032 ±    13.870  ops/s
UpdateStoreBenchmarks.JobDetailsBenchmark.run                         N/A         1000   
     N/A         N/A  thrpt    5    143.981 ±    78.985  ops/s
UpdateStoreBenchmarks.JobDetailsBenchmark.run                         N/A         5000   
     N/A         N/A  thrpt    5     35.224 ±    25.593  ops/s
UpdateStoreBenchmarks.JobDetailsBenchmark.run                         N/A        10000   
     N/A         N/A  thrpt    5     18.869 ±     3.318  ops/s
UpdateStoreBenchmarks.JobInstructionsBenchmark.run                      1          N/A   
     N/A         N/A  thrpt    5     36.013 ±    19.743  ops/s
UpdateStoreBenchmarks.JobInstructionsBenchmark.run                     10          N/A   
     N/A         N/A  thrpt    5     33.813 ±    11.216  ops/s
UpdateStoreBenchmarks.JobInstructionsBenchmark.run                    100          N/A   
     N/A         N/A  thrpt    5     20.516 ±    10.526  ops/s
UpdateStoreBenchmarks.JobInstructionsBenchmark.run                   1000          N/A   
     N/A         N/A  thrpt    5     16.564 ±     2.993  ops/s
UpdateStoreBenchmarks.JobUpdateMetadataBenchmark.run                  N/A          N/A   
      10         N/A  thrpt    5     32.399 ±    21.310  ops/s
UpdateStoreBenchmarks.JobUpdateMetadataBenchmark.run                  N/A          N/A   
     100         N/A  thrpt    5     35.518 ±     7.468  ops/s
UpdateStoreBenchmarks.JobUpdateMetadataBenchmark.run                  N/A          N/A   
    1000         N/A  thrpt    5     19.757 ±    10.035  ops/s
UpdateStoreBenchmarks.JobUpdateMetadataBenchmark.run                  N/A          N/A   
   10000         N/A  thrpt    5     10.849 ±    10.660  ops/s

This patch (off-heap db):

Benchmark                                             (instanceOverrides)  (instances)  (metadata)
 (numTasks)   Mode  Cnt      Score       Error  Units
TaskStoreBenchmarks.DBFetchTasksBenchmark.run                         N/A          N/A   
     N/A       10000  thrpt    5  77746.436 ± 47191.240  ops/s
TaskStoreBenchmarks.DBFetchTasksBenchmark.run                         N/A          N/A   
     N/A       50000  thrpt    5  70099.087 ± 37223.642  ops/s
TaskStoreBenchmarks.DBFetchTasksBenchmark.run                         N/A          N/A   
     N/A      100000  thrpt    5  30461.428 ± 22964.261  ops/s
TaskStoreBenchmarks.MemFetchTasksBenchmark.run                        N/A          N/A   
     N/A       10000  thrpt    5    335.302 ±   229.328  ops/s
TaskStoreBenchmarks.MemFetchTasksBenchmark.run                        N/A          N/A   
     N/A       50000  thrpt    5     61.443 ±    24.280  ops/s
TaskStoreBenchmarks.MemFetchTasksBenchmark.run                        N/A          N/A   
     N/A      100000  thrpt    5     32.129 ±    13.067  ops/s
UpdateStoreBenchmarks.JobDetailsBenchmark.run                         N/A         1000   
     N/A         N/A  thrpt    5    411.866 ±   396.308  ops/s
UpdateStoreBenchmarks.JobDetailsBenchmark.run                         N/A         5000   
     N/A         N/A  thrpt    5     92.208 ±    65.238  ops/s
UpdateStoreBenchmarks.JobDetailsBenchmark.run                         N/A        10000   
     N/A         N/A  thrpt    5     49.870 ±    44.519  ops/s
UpdateStoreBenchmarks.JobInstructionsBenchmark.run                      1          N/A   
     N/A         N/A  thrpt    5     90.074 ±    31.360  ops/s
UpdateStoreBenchmarks.JobInstructionsBenchmark.run                     10          N/A   
     N/A         N/A  thrpt    5    114.224 ±    48.576  ops/s
UpdateStoreBenchmarks.JobInstructionsBenchmark.run                    100          N/A   
     N/A         N/A  thrpt    5    108.767 ±    25.154  ops/s
UpdateStoreBenchmarks.JobInstructionsBenchmark.run                   1000          N/A   
     N/A         N/A  thrpt    5     45.995 ±    14.795  ops/s
UpdateStoreBenchmarks.JobUpdateMetadataBenchmark.run                  N/A          N/A   
      10         N/A  thrpt    5     72.343 ±    77.696  ops/s
UpdateStoreBenchmarks.JobUpdateMetadataBenchmark.run                  N/A          N/A   
     100         N/A  thrpt    5     84.984 ±    27.971  ops/s
UpdateStoreBenchmarks.JobUpdateMetadataBenchmark.run                  N/A          N/A   
    1000         N/A  thrpt    5     89.819 ±    44.923  ops/s
UpdateStoreBenchmarks.JobUpdateMetadataBenchmark.run                  N/A          N/A   
   10000         N/A  thrpt    5     31.670 ±    15.236  ops/s


Please be aware: The values seen here will not really carry over to
real world usage. It would therefore be awesome if one of you could
test this on a larger cluster!


Diffs (updated)
-----

  src/main/java/org/apache/aurora/scheduler/storage/db/DbModule.java e7287cec28e7b8ca978c506bfe821f261bc0ac26


Diff: https://reviews.apache.org/r/52669/diff/


Testing
-------

`./gradlew build`
`./gradlew jmh -Pbenchmarks='UpdateStoreBenchmarks.*|TaskStoreBenchmarks.*'`


Thanks,

Stephan Erb


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