eG Monitoring
 

Measures reported by FSDatasetTest

This test reports the time taken by the indexer to service search queries, and thus sheds light on bottlenecks in query processing in the indexer. In the process, the test also reports the number of active search nodes and active index partitions.

The measures made by this test are as follows:

Measurement Description Measurement Unit Interpretation
Actv_nodes Indicates the number of active search nodes i.e., the number of active query matching processes (fsearch processes). Number Search Nodes are the processes that perform queries against Index Nodes. There will always be at least one Search Node for every Index Node. The Search Node will only search the Index Node that it is assigned to. We will go into the details of topology of Index and Search nodes when we discuss scaling FAST.

Within a Search Node, there is a process called fSearch which is created for each index partition within the Index Node. The fSearch process searches the index partition for matching documents. Then a single process within the Search Node called FDispatch takes all the results from each index partition and merges them into a single result that is ranked and sorted appropriately based on the rules specified in the Index Profile.
Actv_partitions Indicates the number of active index partitions. Number  
Avg_searches_min Indicates the average search rate of the documents in the Indexer. Searches/min A low processing rate could be indicative of a potential slowdown.
Avg_time_search Indicates the average time taken to complete the last analysis. Secs A consistent rise in the value of this measure could indicate a processing bottleneck.
Avg_uncached_search Indicates the average time taken by a query to perform a search operation without looking into the query cache. Secs A consistent rise in the value of this measure could indicate a processing bottleneck.
Timeout_per Indicates the percentage of query timeouts that had occurred in the Indexer. Percent The timeouts may have occured due to the documents that were skipped or due to connection timeout.