内部实现NEST Reindex
的使用滚动到文件从一个索引移动到另一个。
这应该是一个好的起点。
以下你可以找到感兴趣的github。你
var page = 0;
var searchResult = this.CurrentClient.Search<T>(
s => s
.Index(fromIndex)
.AllTypes()
.From(0)
.Size(size)
.Query(this._reindexDescriptor._QuerySelector ?? (q=>q.MatchAll()))
.SearchType(SearchType.Scan)
.Scroll(scroll)
);
if (searchResult.Total <= 0)
throw new ReindexException(searchResult.ConnectionStatus, "index " + fromIndex + " has no documents!");
IBulkResponse indexResult = null;
do
{
var result = searchResult;
searchResult = this.CurrentClient.Scroll<T>(s => s
.Scroll(scroll)
.ScrollId(result.ScrollId)
);
if (searchResult.Documents.HasAny())
indexResult = this.IndexSearchResults(searchResult, observer, toIndex, page);
page++;
} while (searchResult.IsValid && indexResult != null && indexResult.IsValid && searchResult.Documents.HasAny());
也可以看看integration test为Scroll
[Test]
public void SearchTypeScan()
{
var scanResults = this.Client.Search<ElasticsearchProject>(s => s
.From(0)
.Size(1)
.MatchAll()
.Fields(f => f.Name)
.SearchType(SearchType.Scan)
.Scroll("2s")
);
Assert.True(scanResults.IsValid);
Assert.False(scanResults.FieldSelections.Any());
Assert.IsNotNullOrEmpty(scanResults.ScrollId);
var results = this.Client.Scroll<ElasticsearchProject>(s=>s
.Scroll("4s")
.ScrollId(scanResults.ScrollId)
);
var hitCount = results.Hits.Count();
while (results.FieldSelections.Any())
{
Assert.True(results.IsValid);
Assert.True(results.FieldSelections.Any());
Assert.IsNotNullOrEmpty(results.ScrollId);
var localResults = results;
results = this.Client.Scroll<ElasticsearchProject>(s=>s
.Scroll("4s")
.ScrollId(localResults.ScrollId));
hitCount += results.Hits.Count();
}
Assert.AreEqual(scanResults.Total, hitCount);
}
来源
2015-07-10 07:21:19
Rob
谢谢。 不支持聚合查询查询类型“扫描”。那么使用没有搜索类型'扫描'的滚动仍然很好? –
是的,但滚动效率会降低https://www.elastic.co/guide/en/elasticsearch/guide/current/scan-scroll.html#scan-scroll。取决于你的用例。 – Rob