Case Studies

Problem: The client’s Elastic server is experiencing sporadic crashes, evident from StackOverflowError logs linked to “GraphTokenStreamFiniteStrings.” While a potential fix exists in Lucene 9.7, the product’s certification with Elastic 7.17 using Lucene 8.11.1 complicates the implementation of the fix. The client seeks assistance to evaluate the possibility of backporting Lucene 9.7 changes to Lucene 8.11.1. […]

Problem: The problem identified in Apache Airflow version 2.5.0 was the lack of password confirmation during password changes, posing a significant security risk to users. This vulnerability could potentially lead to unauthorized access and session hijacking within the Airflow application. Solution: Based on the client’s request and the provided information, the recommended solution steps to […]

Problem: The client reported instances of Cassandra databases experiencing unavailability and performance degradation, leading to application connection errors. Specifically, nodes were found to be unresponsive, and memory and CPU utilization spiked unexpectedly. Additionally, there were concerns about data inconsistencies between data centers and excessive tombstones affecting performance. Process: Initial Investigation: Upon initial investigation, it was […]

Problem: After deleting 52 million rows from a table, the client performed a VACUUM FULL and REINDEX on the table. Following these maintenance operations, the performance of large joins involving this table has significantly deteriorated, with query execution times increasing from minutes to hours. The task is to identify the cause of this performance regression […]

Problem: The client is unable to register to a FreeIPA server, encountering the error message “Cannot obtain CA certificate.” The error log indicates issues with LDAP access and Kerberos database. Process: The expert took the following steps to address the client’s registration issue with the FreeIPA server: Reproduction of the Setup: The expert attempted to […]

Problem: The client had 10 monthly bill cycles, and during such bill cycle days, the billing process was connected to the DB cluster in 20 streams. After the process had started the replication the above-mentioned billing process failed with the “could not send data to the client: Connection reset by peer” error. The client reduced […]

Problem: The client was facing a situation where fluent-bit containers jeopardized the k8s host by overusing the temporary space which is on the host. Solution: After the investigation, the expert team suggested the next solution to the client: Resource Limitations: Checked for resource limitations on the fluent-bit containers. Insufficient CPU or memory limits could have […]

Problem: The client experienced timeout errors when running adhoc queries in an Apache Cassandra cluster. Specifically, a query with multiple conditions was timing out due to the coordinator node not receiving responses from replica nodes. Process: Here are the steps taken by the expert in the process of resolving the problem: Assessment of Query Efficiency: […]

Problem: A client encountered connection errors while attempting to connect to a Cassandra database cluster using cqlsh. The error messages indicated issues related to protocol version compatibility and SSL certificate verification failures (“This version of the driver does not support protocol version 21”). Process: Initial Diagnosis: The support team analyzed the error messages provided by […]