public string GetStatus()
{
// Use the cluster health API to verify that the Best Bets index is functioning.
// Maps to https://ncias-d1592-v.nci.nih.gov:9299/_cluster/health/bestbets?pretty (or other server)
//
// References:
// https://www.elastic.co/guide/en/elasticsearch/reference/master/cluster-health.html
// https://github.com/elastic/elasticsearch/blob/master/rest-api-spec/src/main/resources/rest-api-spec/api/cluster.health.json#L20
IClusterHealthResponse response = _elasticClient.ClusterHealth(hd =>
{
hd = hd
.Index("autosg");
return(hd);
});
if (!response.IsValid)
{
_logger.LogError("Error checking ElasticSearch health.");
_logger.LogError("Returned debug info: {0}.", response.DebugInformation);
throw new APIErrorException(500, "Errors Occurred.");
}
if (response.Status != "green" &&
response.Status != "yellow")
{
_logger.LogError("Elasticsearch not healthy. Index status is '{0}'.", response.Status);
throw new APIErrorException(500, "Service not healthy.");
}
return(HEALTHY_STATUS);
}
/// <summary>
/// Determines whether Elasticsearch cluster is ready.
/// </summary>
public async Task <Status> IsReadyAsync(CancellationToken cancellationToken)
{
var healthRequest = new ClusterHealthRequest
{
WaitForStatus = WaitForStatus.Green
};
IClusterHealthResponse healthResponse = await _client
.ClusterHealthAsync(healthRequest, cancellationToken);
return(new Status
{
IsReady = healthResponse.IsValid,
Message = healthResponse.DebugInformation
});
}
public ActionResult Status()
{
IClusterHealthResponse res = null;
int num = 0;
string status = "unknown";
try
{
res = HlidacStatu.Lib.ES.Manager.GetESClient().ClusterHealth();
num = res?.NumberOfNodes ?? 0;
status = res?.Status.ToString() ?? "unknown";
}
catch (Exception e)
{
HlidacStatu.Util.Consts.Logger.Error("Status page error", e);
ViewBag.Error = e;
}
return(Content(string.Format("{0}-{1}", num, status)));
}
private static string BuildClusterHealthView(IClusterHealthResponse health)
{
StringBuilder stb = new StringBuilder();
stb.Append(@"<div>");
stb.Append(@"<style> .headerCell {width: 25%;} </style>");
stb.Append(@"<table class='full_width_table'>");
stb.Append(@"<tr><td class='tableheader' colspan=2>Cluster Health</td></tr>");
stb.Append($"<tr><td class='tablecell headerCell'>Cluster Name:</td><td class='tablecell' style='width: 100px'>{health.ClusterName}</td></tr>");
stb.Append($"<tr><td class='tablecell headerCell'>Status:</td><td class='tablecell' style='width: 100px color: {health.Status};'>{health.Status}</td></tr>");
stb.Append($"<tr><td class='tablecell headerCell'>Number of Nodes:</td><td class='tablecell' style='width: 100px'>{health.NumberOfNodes}</td></tr>");
stb.Append($"<tr><td class='tablecell headerCell'>Number of Data Nodes:</td><td class='tablecell' style='width: 100px'>{health.NumberOfDataNodes}</td></tr>");
stb.Append($"<tr><td class='tablecell headerCell'>Active Primary Shards:</td><td class='tablecell' style='width: 100px'>{health.ActivePrimaryShards}</td></tr>");
stb.Append($"<tr><td class='tablecell headerCell'>Active Shards:</td><td class='tablecell' style='width: 100px'>{health.ActiveShards}</td></tr>");
stb.Append($"<tr><td class='tablecell headerCell'>Number of Pending Tasks:</td><td class='tablecell' style='width: 100px'>{health.NumberOfPendingTasks}</td></tr>");
stb.Append(@" </table>");
stb.Append(@"</div>");
return(stb.ToString());
}
public IActionResult Index()
{
SearchRequest <Person> sr = new SearchRequest <Person>
{
Query = new MatchQuery
{
Field = "firstname",
Query = "Hubert"
}
};
var searchResults = client.Search <Person>(sr);
var searchResults2 = client.Search <Person>(s => s
.Query(q => q.Match(m => m.Field("lastname")
.Query("Dumas")))
);
var allPeople = client.Search <Person>();
var multiResults = client.Search <Person>(s => s
.Query(q => q.MultiMatch(c => c
.Fields(f => f.Field("lastname").Field("firstname"))
.Query("Gaye")
))
);
var multiResults2 = client.Search <Person>(s => s
.Query(q => q.MultiMatch(c => c
.Fields(f => f.Field(p => p.Firstname).Field(p => p.Lastname))
.Query("Dumas")
))
);
IClusterHealthResponse res = client.ClusterHealth();
return(View(res));
}
/// <summary>
/// Checks if a single host is healthy
/// </summary>
/// <returns>The host healthy.</returns>
private async Task <bool> IsHostHealthy(string alias)
{
// Use the cluster health API to verify that the Best Bets index is functioning.
// Maps to https://ncias-d1592-v.nci.nih.gov:9299/_cluster/health/bestbets?pretty (or other server)
//
// References:
// https://www.elastic.co/guide/en/elasticsearch/reference/master/cluster-health.html
// https://github.com/elastic/elasticsearch/blob/master/rest-api-spec/src/main/resources/rest-api-spec/api/cluster.health.json#L20
try
{
IClusterHealthResponse response = await _elasticClient.ClusterHealthAsync(hd => hd.Index(alias));
if (!response.IsValid)
{
_logger.LogError($"Error checking ElasticSearch health for {alias}.");
_logger.LogError($"Returned debug info: {response.DebugInformation}.");
}
else
{
if (response.Status == "green" || response.Status == "yellow")
{
//This is the only condition that will return true
return(true);
}
else
{
_logger.LogError($"Alias ${alias} status is not good");
}
}
}
catch (Exception ex)
{
_logger.LogError($"Error checking ElasticSearch health for {alias}.");
_logger.LogError($"Exception: {ex.Message}.");
}
return(false);
}