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| Query | 2 Analyzers | 3 Analyzers | ||
|---|---|---|---|---|
| Time(s) | Mean TPS | Time(s) | Mean TPS | |
INSERT INTO TABLE wikiAvgArticleLength SELECT AVG(length) as avg_article_length FROM wiki | 222.70 | 75234.03 | 167.27 | 100164.18 |
INSERT INTO TABLE wikiTotalArticleLength SELECT SUM(length) as total_article_chars FROM wiki | 221.74 | 75554.76 | 166.92 | 100373.80 |
INSERT INTO TABLE wikiTotalArticlePages SELECT COUNT(*) as total_pages FROM wiki | 221.80 | 75536.05 | 166.14 | 100842.18 |
INSERT INTO TABLE wikiContributorSummary SELECT contributor_username, COUNT(*) as page_count FROM wiki GROUP BY contributor_username | 236.11 | 70958.52 | 181.42 | 92350.26 |
DAS Performance Test Round 3: RDBMS (MySQL)
Infrastructure used
- c4.2xlarge Amazon EC2 instances as the DAS nodes
- One DAS node as the publisher
- A c3.2xlarge Amazon instance as the database node
Receiver node Data Persistence Performance
A reduction in the throughput is observed as shown below after 1200000 events in both DAS receiver nodes. This reduction is caused by limitations of MySQL. The receiver performance variation of the second node of the 2 node receiver cluster is as given below. As the initial buffer filling in receiver queues give very high receiver performance at the beginning of the event publishing, event rate after the first 1200000 events was considered for the following graph.
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| Info | ||
|---|---|---|
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After around 30 million events are published, a sudden drop can be observed in receiver performance that can be considered as the break point of MySQL event store. Another type of event store such as HBase event store should be used when the receiver performance has to be maintained unchanged. |
Testing with large events
The following results were obtained by testing the two-node HA (High Availability) DAS cluster with 10 million events published via the Analyzing Wikepedia Data sample. Each event in this sample contains several kilobytes that represent large events.
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The above graph shows the amount of data that is published per second (referred to as the data rate). The data rate published is significantly reduced at the initial stages due to the flow control mechanisms of the receiver. It stabilizes at around 25 MB per second.
With MySQL RDBMS event store
DAS data persistence was measured by publishing to 2 load balanced receiver nodes with MySQL database.
| Sample | Number of Events | Mean Event Rate |
|---|---|---|
Smart Home sample | 100000000 | 5741 events per second |
Wikipedia sample | 15901127 | 4438 events per second |
Processing Performance
The following topics describe the analyzer performance of WSO2 DAS.
With MySQL RDBMS event store
Spark analyzing performance (time to complete execution) was measured using a 2 node DAS analyzer cluster with MySQL database.
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| Data set | Event Count | Query Type | Time Taken (seconds) |
|---|---|---|---|
| Smart Home | 10000000 | INSERT OVERWRITE TABLE cityUsage SELECT metro_area, avg(power_reading) AS avg_usage, min(power_reading) AS min_usage, max(power_reading) AS max_usage FROM smartHomeData GROUP BY metro_area | 26 sec |
| Smart Home | 10000000 | INSERT OVERWRITE TABLE peakDeviceUsageRange SELECT house_id, (max(power_reading) - min(power_reading)) AS usage_range FROM smartHomeData WHERE is_peak = true AND metro_area = "Seattle" GROUP BY house_id | 22 sec |
| Smart Home | 10000000 | INSERT OVERWRITE TABLE stateAvgUsage SELECT state, avg(power_reading) AS state_avg_usage FROM smartHomeData | 21 sec |
| Smart Home | 10000000 | INSERT OVERWRITE TABLE stateUsageDifference SELECT a2.state, (a2.state_avg_usage-a1.overall_avg) AS avg_usage_difference FROM (select avg(state_avg_usage) as overall_avg from stateAvgUsage) as a1 join stateAvgUsage as a2 | 1 sec |
| Wikipedia | 10000000 | INSERT INTO TABLE wikiAvgArticleLength SELECT AVG(length) as avg_article_length FROM wiki | 48 min |
| Wikipedia | 10000000 | INSERT INTO TABLE wikiContributorSummary SELECT contributor_username, COUNT(*) as page_count FROM wiki GROUP BY contributor_username | 1 hour 45 min |
| Wikipedia | 10000000 | INSERT INTO TABLE wikiTotalArticleLength SELECT SUM(length) as total_article_chars FROM wiki | 44 min |
| Wikipedia | 10000000 | INSERT INTO TABLE wikiTotalArticlePages SELECT COUNT(*) as total_pages FROM wiki | 1 hour 17 min |
Single Node Local Clustered Setup Statistics
A fully distributed setup was tested locally with multiple JVMs, and with the following hardware infrastructure specifications.
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It was observed that the performance here is comparatively higher (taking into account that the setup consists of a single machine). This is mainly due to the DAS server and MySQL existing locally, and having no physical network I/O delays as a result. This allows the queries to be executed in an optimal manner.
Indexing Performance
In the following table, the shardIndexRecordBatchSize indicates the amount of index data (in bytes) to be processed at a time by a shard index worker.
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This test was conducted on a test setup as shown in the following figure,
Infrastructure used
- JMeter, DAS 3.1.0, MySQL: c4.xlarge (4 vCPUs, 7.5 GB, EBS-Only, 750 Mbps network)
- Linux kernel 4.44, java version "1.8.0_131", JVM flags : -Xmx4g -Xms2g, MySQL version 5.7
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