Monitoring query latency

Client actions such as storing, retrieving, or deleting objects create queries to the grid's distributed database of object metadata. You should monitor trends in query latency to ensure that grid resources are adequate for the current load.

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About this task

Temporary increases in query latency are normal and can be caused by a sudden increase in ingest requests. Failed queries are also normal and can result from transient network issues or nodes that are temporarily unavailable. However, if the average time to perform a query increases, overall grid performance declines.

If you notice that query latency is increasing over time, you should consider adding additional Storage Nodes in an expansion procedure to satisfy future workloads .

The High latency for metadata queries alert is triggered if the average time for queries is too long.

Procedure

  1. Select Nodes > Storage Node > Objects.
  2. Scroll down to the Queries table and view the value for Average Latency.
    Queries Table
  3. Click the chart icon Chart Icon to chart the value over time.
    Average Query Latency Chart

    The example chart shows spikes in query latency during normal grid operation.