我遇到了使用 .NET NEST 客户端和 ElasticSearch 进行批量索引的性能随着时间的推移、索引数量和文档数量恒定而降低的情况。
我们正在奔跑ElasticSearch Version: 0.19.11, JVM: 23.5-b02在具有 Ubuntu Server 12.04.1 LTS 64 位和 Sun Java 7 的 m1.large Amazon 实例上。除了 Ubuntu 安装附带的内容之外，该实例上没有运行任何其他内容。
Amazon M1 大型实例: from http://aws.amazon.com/ec2/instance-types/ http://aws.amazon.com/ec2/instance-types/
7.5 GiB memory
4 EC2 Compute Units (2 virtual cores with 2 EC2 Compute Units each)
850 GB instance storage
64-bit platform
I/O Performance: High
EBS-Optimized Available: 500 Mbps
API name: m1.large
ES_MAX_MEM 设置为 4g，ES_MIN_MEM 设置为 2g
每天晚上，我们在 .NET 应用程序中使用 NEST 索引/重新索引约 15000 个文档。在任何给定时间，只有一个索引包含
第一次安装服务器时，前几天索引和搜索速度很快，然后索引开始变得越来越慢。批量索引一次索引 100 个文档，一段时间后，批量操作最多需要 15 秒才能完成。之后我们开始看到很多以下异常并且索引逐渐停止。
System.Net.WebException: The request was aborted: The request was canceled.
at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
at System.Threading.Tasks.TaskFactory`1.FromAsyncCoreLogic(IAsyncResult iar, Func`2 endFunction, Action`1 endAction, Task`1 promise, Boolean requiresSynchronization) :
构建索引实现如下所示
private ElasticClient GetElasticClient()
{
var setting = new ConnectionSettings(ConfigurationManager.AppSettings["elasticSearchHost"], 9200);
setting.SetDefaultIndex("products");
var elastic = new ElasticClient(setting);
return elastic;
}
private void DisableRefreshInterval()
{
var elasticClient = GetElasticClient();
var s = elasticClient.GetIndexSettings("products");
var settings = s != null && s.Settings != null ? s.Settings : new IndexSettings();
settings["refresh_interval"] = "-1";
var result = elasticClient.UpdateSettings(settings);
if (!result.OK)
_logger.Warn("unable to set refresh_interval to -1, {0}", result.ConnectionStatus == null || result.ConnectionStatus.Error == null ? "" : result.ConnectionStatus.Error.ExceptionMessage);
}
private void EnableRefreshInterval()
{
var elasticClient = GetElasticClient();
var s = elasticClient.GetIndexSettings("products");
var settings = s != null && s.Settings != null ? s.Settings : new IndexSettings();
settings["refresh_interval"] = "1s";
var result = elasticClient.UpdateSettings(settings);
if (!result.OK)
_logger.Warn("unable to set refresh_interval to 1s, {0}", result.ConnectionStatus == null || result.ConnectionStatus.Error == null ? "" : result.ConnectionStatus.Error.ExceptionMessage);
}
public void Index(IEnumerable<Product> products)
{
var enumerable = products as Product[] ?? products.ToArray();
var elasticClient = GetElasticClient();
try
{
DisableRefreshInterval();
_logger.Info("Indexing {0} products", enumerable.Count());
var status = elasticClient.IndexMany(enumerable as IEnumerable<Product>, "products");
if (status.Items != null)
_logger.Info("Done, Indexing {0} products, duration: {1}", status.Items.Count(), status.Took);
if (status.ConnectionStatus.Error != null)
{
_logger.Error(status.ConnectionStatus.Error.OriginalException);
}
}
catch(Exception ex)
{
_logger.Error(ex);
}
finally
{
EnableRefreshInterval();
}
}
重新启动elasticsearch守护进程似乎没有任何区别，但删除索引并重新索引所有内容却会产生任何影响。但几天后我们就会遇到同样的索引速度慢的问题。
我刚刚删除了索引，并在每次批量索引操作后重新启用刷新间隔后添加了优化，希望这可以防止索引降级。
...
...
finally
{
EnableRefreshInterval();
elasticClient.Optimize("products");
}
我在这里做错了什么吗？
