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martinsumner 2017-02-02 15:13:49 +00:00
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@ -50,7 +50,9 @@ Also the 5:1 ratio of GET:UPDATE is not quite that as:
When testing on a single node cluster (with a smaller ring size, and a smaller keyspace) the relative benefit of leveled appears to be much smaller. One big difference between the single node testing completed and multi-node testing is that between testing the disk was switched from using a single drive to using a mirrored pair. It is suspected that the amplified improvement between single-node test and multi-node tests is related in-part to the cost of software-based mirroring exaggerating write contention to disk. When testing on a single node cluster (with a smaller ring size, and a smaller keyspace) the relative benefit of leveled appears to be much smaller. One big difference between the single node testing completed and multi-node testing is that between testing the disk was switched from using a single drive to using a mirrored pair. It is suspected that the amplified improvement between single-node test and multi-node tests is related in-part to the cost of software-based mirroring exaggerating write contention to disk.
Leveldb achieved more work in a sense during the test, as the test was run outside of the compaction window for leveled - so the on-disk size of the leveled store was higher as no replaced values had been compacted. Test 6 below will examine the impact of the comapaction window on throughput. Leveldb achieved more work in a sense during the test, as the test was run outside of the compaction window for leveled - so the on-disk size of the leveled store was higher as no replaced values had been compacted. Test 6 below will examine the impact of the compaction window on throughput.
On the flip side, it could be argued that the 73% difference under-estimates the difference in that the greater volume achieved meant that by the back-end of the test more GETs were requiring fetches in leveled when compared with leveldb. Because of this, by the last ten minutes of the test, the throughput advantage had been reduced to <b>55.4%</b>.
## Riak Cluster Test - 2 ## Riak Cluster Test - 2