public static void ReindexStateProvince(DateTime beginDateTime)
{
var reindex = new ElasticsearchCrudReindex <StateProvince, StateProvinceV2>(
new IndexTypeDescription("stateprovinces", "stateprovince"),
new IndexTypeDescription("stateprovinces_v2", "stateprovince"),
"http://localhost:9200");
reindex.ScanAndScrollConfiguration = new ScanAndScrollConfiguration(new TimeUnitSecond(5), 1000);
reindex.TraceProvider = new ConsoleTraceProvider(TraceEventType.Information);
reindex.Reindex(
StateProvinceReindexConfiguration.BuildSearchModifiedDateTimeLessThan(beginDateTime),
StateProvinceReindexConfiguration.GetKeyMethod,
StateProvinceReindexConfiguration.CreateStateProvinceFromStateProvince);
}
public static void ReindexStateProvince(DateTime beginDateTime)
{
var reindex = new ElasticsearchCrudReindex<StateProvince, StateProvinceV2>(
new IndexTypeDescription("stateprovinces", "stateprovince"),
new IndexTypeDescription("stateprovinces_v2", "stateprovince"),
"http://localhost:9200");
reindex.ScanAndScrollConfiguration = new ScanAndScrollConfiguration(new TimeUnitSecond(5), 1000);
reindex.TraceProvider = new ConsoleTraceProvider(TraceEventType.Information);
reindex.Reindex(
StateProvinceReindexConfiguration.BuildSearchModifiedDateTimeLessThan(beginDateTime),
StateProvinceReindexConfiguration.GetKeyMethod,
StateProvinceReindexConfiguration.CreateStateProvinceFromStateProvince);
}
static void Main(string[] args)
{
var createIndexPersonV1 = new CreateIndexPersonV1();
#region Setup initial index, not required usually because the index should already exist...
// CREATE NEW INDEX person_v1 for Person Entity class
createIndexPersonV1.SaveToElasticsearchPerson();
Console.WriteLine("Created new index person_v1 in elasticsearch");
Console.ReadLine();
// CREATE NEW ALIAS person for INDEX persons_v1
createIndexPersonV1.CreatePersonAliasForPersonV1Mapping("persons");
Console.WriteLine("Created new alias person for index person_v1 in elasticsearch");
#endregion Setup initial index, not required usually because the index should already exist...
// The following 3 steps show you how to do a reindex in elasticsearch using scroll and an alias with no downtime
// ---------------------------------------------------------
// STEP 1: CREATE NEW INDEX persons_v2 from INDEX persons_v1
// ---------------------------------------------------------
// - This timestamp is usually DateTime.UtcNow.
// - It is required so all the indexes which were updated during the reindex can be found
DateTime beginDateTime = DateTime.UtcNow.AddYears(-7);
var reindex = new ElasticsearchCrudReindex <Person, PersonV2>(
new IndexTypeDescription("persons_v1", "person"),
new IndexTypeDescription("persons_v2", "person"),
"http://localhost:9200");
reindex.ScanAndScrollConfiguration = new ScanAndScrollConfiguration(new TimeUnitSecond(5), 1000);
reindex.TraceProvider = new ConsoleTraceProvider(TraceEventType.Information);
reindex.Reindex(
PersonReindexConfiguration.BuildSearchModifiedDateTimeLessThan(beginDateTime),
PersonReindexConfiguration.GetKeyMethod,
PersonReindexConfiguration.CreatePersonV2FromPerson);
Console.WriteLine("Created new index from version 1 index");
// ---------------------------------------------------------
// STEP 2: REPLACE ALIAS persons TO INDEX persons_v2
// ---------------------------------------------------------
reindex.SwitchAliasfromOldToNewIndex("persons");
Console.WriteLine("Replace index for alias");
// ---------------------------------------------------------
// STEP 3: NOW GET ALL THE DOCUMENTS WHICH WERE UPDATED WHILE REINDEXING
// ---------------------------------------------------------
// NOTE: if the document is updated again in the meantime, it will be overwitten with this method.
// If required, you must check the update timestamp of the item in the new index!
reindex.Reindex(
PersonReindexConfiguration.BuildSearchModifiedDateTimeGreaterThan(beginDateTime),
PersonReindexConfiguration.GetKeyMethod,
PersonReindexConfiguration.CreatePersonV2FromPerson);
Console.WriteLine("Replace index for person documents which were updating while reindexing");
// Wait for Elasticsearch...
Thread.Sleep(1500);
using (var context = new ElasticsearchContext("http://localhost:9200", new ElasticsearchMappingResolver()))
{
long countBefore = context.Count <Person>(PersonReindexConfiguration.BuildSearchModifiedDateTimeLessThan(beginDateTime));
long countAfter = context.Count <Person>(PersonReindexConfiguration.BuildSearchModifiedDateTimeGreaterThan(beginDateTime));
Console.WriteLine("Persons: before: {0} After:{1}", countBefore, countAfter);
}
Console.ReadLine();
}
