OpenSearch can enforce read-only states on clusters or indices to protect against issues like low disk space or cluster instability. Understanding and resolving these blocks is crucial for maintaining a healthy and operational cluster. Below is a guide to address common scenarios. How to Resolve cluster.blocks.read_only The cluster.blocks.read_only setting typically occurs when OpenSearch detects a critical issue, […]
In this guide, I will tell you how to prevent BufferOverflowError when you get logs from Kafka/in_tail, and your output can’t connect to OpenSearch/ElasticSearch. If you use input from Kafka/in_tail and sometimes you have issues with connection to OpenSearch/ElasticSearch, you can customize your Fluentd buffer in the output to stop getting logs from the input […]
Adaptive replica selection is a mechanism designed to improve query response times and alleviate strain on overloaded OpenSearch nodes. It ensures that nodes experiencing delays due to issues like hardware, network, or configuration problems do not slow down the overall query process. How It Works Consider a scenario where one node in the cluster is […]
When running an Elasticsearch or OpenSearch cluster, efficient disk space management is essential for ensuring stability and performance. These platforms provide configurable settings to manage how shards are allocated based on available disk space. Here, we discuss three key settings related to disk allocation thresholds: 1. cluster.routing.allocation.disk.threshold_enabledThis setting enables or disables disk-based shard allocation. When set […]
Sometimes, you can get the associated error Limit of total fields [1000] has been exceeded I will explain what it is and how to fix it.You can find that error in OpenSaerch/ElasticSearch logs /var/log/opensearch or /var/log/elasticsearchFor example, in the screenshot, you can see that error: In OpenSearch and Elasticsearch, the number of fields in an index […]
The indices.query.bool.max_clause_count setting in OpenSearch specifies the maximum number of clauses allowed in a bool query. A clause in this context is a condition in the query, such as a must, should, or must_not statement. If your query exceeds this limit, you’ll encounter an error, often indicating that the query is too large or complex. By default, the value of indices.query.bool.max_clause_count is set to 1024, […]
If you need to migrate visualizations or dashboards from one OpenSearch instance to another, you can do the following steps: Export Saved Objects Go to Management > Saved Objects > Export. Select the objects to export (e.g., dashboards or visualizations). Correct the .ndjson file It is important to note that if you have already created a new […]
Sometimes, you can encounter an error shown at the bottom right when you try to create a detector or click on security analytics or any other links within the analytics.For example, in the screenshot below: To fix that:Option 1: An example is in the screenshot below: Now you can see lists of Log types. If you […]
Managing storage requirements for an OpenSearch cluster deployed via a Helm chart in Kubernetes can present unique challenges, especially when scaling Persistent Volume Claims (PVCs) for StatefulSets. PVC resizing in Kubernetes is a straightforward concept, but its implementation may run into issues depending on the underlying storage class, StatefulSet behavior, and OpenSearch’s requirements. This article […]
If index-pattern was recreated and its id hasn’t been customized to the same as it was before, you’ll get an error in all related visualizations: Could not locate that index-pattern (id: index-pattern_id), click here to re-create it The link will lead you to the index-pattern creation menu. But there is no need to recreate the […]