Configuring a connection pool is something that developers often get wrong. There are several, possibly counter-intuitive for some, principles that need to be understood when configuring the pool.
https://github.com/brettwooldridge/HikariCP/wiki/About-Pool-Sizing
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As we have some business requirements about data aggregation and online processing, so we did a quick PoC on Apache Druid. Next I will show how to build druid quickly and start your ingestion task.
1.Select release version which is compatible to your existing system and download the package.
2.Choose what kind of druid service you want to start with
Then you start druid service in every node by execute start-cluster script.
3.Visit druid through browser, http://IP:8888
Next I load the data from local file and can ingest the data file as a datasource, and finally query data by SQL.
Task configuration
Anonymous is discussing.
{
"type": "index_parallel",
"id": "index_parallel_wikiticker-2015-09-12-sampled_2020-02-18T11:17:29.236Z",
"resource": {
"availabilityGroup": "index_parallel_wikiticker-2015-09-12-sampled_2020-02-18T11:17:29.236Z",
"requiredCapacity": 1
},
"spec": {
"dataSchema": {
"dataSource": "wikiticker-2015-09-12-sampled",
"parser": {
"type": "string",
"parseSpec": {
"format": "json",
"timestampSpec": {
"column": "time",
"format": "iso"
},
"dimensionsSpec": {
"dimensions": [
"channel",
"cityName",
"comment",
"countryIsoCode",
"countryName",
"isAnonymous",
"isMinor",
"isNew",
"isRobot",
"isUnpatrolled",
"namespace",
"page",
"regionIsoCode",
"regionName",
"user"
]
}
}
},
"metricsSpec": [
{
"type": "count",
"name": "count"
},
{
"type": "longSum",
"name": "sum_added",
"fieldName": "added",
"expression": null
},
{
"type": "longSum",
"name": "sum_deleted",
"fieldName": "deleted",
"expression": null
},
{
"type": "longSum",
"name": "sum_delta",
"fieldName": "delta",
"expression": null
},
{
"type": "longSum",
"name": "sum_metroCode",
"fieldName": "metroCode",
"expression": null
}
],
"granularitySpec": {
"type": "uniform",
"segmentGranularity": "DAY",
"queryGranularity": "HOUR",
"rollup": true,
"intervals": null
},
"transformSpec": {
"filter": null,
"transforms": []
}
},
"ioConfig": {
"type": "index_parallel",
"firehose": {
"type": "local",
"baseDir": "/opt/druid-0.16.0/quickstart/tutorial",
"filter": "wikiticker-2015-09-12-sampled.json.gz",
"parser": null
},
"appendToExisting": false
},
"tuningConfig": {
"type": "index_parallel",
"maxRowsPerSegment": null,
"maxRowsInMemory": 1000000,
"maxBytesInMemory": 0,
"maxTotalRows": null,
"numShards": null,
"partitionsSpec": null,
"indexSpec": {
"bitmap": {
"type": "concise"
},
"dimensionCompression": "lz4",
"metricCompression": "lz4",
"longEncoding": "longs"
},
"indexSpecForIntermediatePersists": {
"bitmap": {
"type": "concise"
},
"dimensionCompression": "lz4",
"metricCompression": "lz4",
"longEncoding": "longs"
},
"maxPendingPersists": 0,
"forceGuaranteedRollup": false,
"reportParseExceptions": false,
"pushTimeout": 0,
"segmentWriteOutMediumFactory": null,
"maxNumConcurrentSubTasks": 1,
"maxRetry": 3,
"taskStatusCheckPeriodMs": 1000,
"chatHandlerTimeout": "PT10S",
"chatHandlerNumRetries": 5,
"maxNumSegmentsToMerge": 100,
"totalNumMergeTasks": 10,
"logParseExceptions": false,
"maxParseExceptions": 2147483647,
"maxSavedParseExceptions": 0,
"partitionDimensions": [],
"buildV9Directly": true
}
},
"context": {
"forceTimeChunkLock": true
},
"groupId": "index_parallel_wikiticker-2015-09-12-sampled_2020-02-18T11:17:29.236Z",
"dataSource": "wikiticker-2015-09-12-sampled"
}
Task running status
Task finished, you can see the item in datasource/segment/query
Why is business continuity planning important?
Every organisation is at risk from potential disasters that include:
A Business Continuity Plan includes:
Creating a business continuity plan
A BCP typically includes five sections:
Establish control
Senior managers or a BCP Committee would normally:
This BCP committee is normally comprised of the following members:
Business impact analysis
Plans for business continuity
Readiness procedures
Quality assurance techniques
What to do when a disruption occurs
Disruptions are handled in three steps:
Recovery and restoration
Conclusion
Items
Reference: https://www.publicsafety.gc.ca/cnt/rsrcs/pblctns/bsnss-cntnt-plnnng/index-en.aspx
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