CLI Usage
Write Hammer:
Usage:
$ ./bin/hammer write feature.geojson
Options:
-t, --time Amount of time to hammer (e.g. 5s, 10m, 1h)
-c, --concurrency Number of concurrent requests to send (default 10)
Write-and-list Hammer:
Usage:
$ ./bin/hammer write-and-list feature.geojson
Options:
-t, --time Amount of time to hammer (e.g. 5s, 10m, 1h)
-c, --concurrency Number of concurrent requests to send (default 10)
Necessary Environment Variables:
CardboardRegion - region of table
CardboardTable - table name
CardboardBucket - S3 bucket
CardboardPrefix - S3 prefix
API
runHammer(hammerFunction, opts, callback);
hammerFunc- an async function that takes no parameters (or is already bound) and returns (err, data). Each of the properties on the data object get min'd, max'd, sum'd and avg'dopts- Has two properties, number and concurrency, which are used to control how many runs the hammerFunc gets calledcallback- gets a return of the error, and returns an object with the total time, request count, and calulates avg's, min's, max's and sum's of the hammer returned metrics
runHammer(writeHammer.bind(this, {type:'Feature',geojson:{...}}, 'dataset'), {}, functioon(err, output) {
if (err) throw err;
console.log('Results:');
console.log(`Size: ${buffer.length}`);
console.log(`Writes: ${output.number}`);
console.log(`Time: ${output.time}`);
console.log(`Req/s: ${output.number / (output.time / 1000) }`);
console.log(`Min Latency: ${output.min_latency}`);
console.log(`Avg Latency: ${output.avg_latency}`);
console.log(`Max Latency: ${output.max_latency}`);
console.log(`Throttles: ${output.sum_throttles}`);
});
writeHammer(geojson, datasetId, callback);
geojson- a single geojson feature who's ID will get repeatedly rewritten and put to the cardboard table defined in the environment.datasetId- the id of the datasetcallback- gets a return of the error, or returns an object with latency of the single request and a count of the number of throttles it encountered
writeHammer({type:'Feature', geojson:{...}}, 'dataset', function(err, metrics) {
if (err) throw err;
console.log(`Latency: ${metrics.latency}`);
console.log(`Throttles: ${metrics.throttles}`);
});
writeAndListHammer(geojson, datasetId, callback);
geojson- a single geojson feature who's ID will get written once and then polled until showing up in the listing index.datasetId- the id of the datasetcallback- gets a return of the error, or returns an object with latency of the average list request, a count of the number of tries to get a successful list, and a count of the number of read throttles it encountered
writeAndListHammer({type:'Feature', geojson:{...}}, 'dataset', function(err, metrics) {
if (err) throw err;
console.log(`Latency: ${metrics.latency}`);
console.log(`Throttles: ${metrics.throttles}`);
});
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