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    Primo VE NA04- RCA - October 30, 2018


    This document serves as a Root Cause Analysis for the Primo VE NA04 service interruption experienced by Ex Libris customers on October 30th, 2018

    The goal of this document is to share our findings regarding the event, specify the root cause analysis, outline actions to be taken to solve the downtime event, as well as preventive measures Ex Libris is taking to avoid similar cases in future.

    Event Timeline

    Intermediate service interruptions were experienced by Ex Libris customers served by the Primo VE NA04 instance at our NA Data Center during the following time period:

    October 30th, 2018 from 10:30 AM until 01:00 PM Chicago time

    During the event, the service was intermittent for the environment.

    Root Cause Analysis

    Ex Libris Engineers investigated this event to determine the root cause analysis with the following results:

    Extremely long queries in the system caused a huge memory consumption.

    After deep analysis Ex Libris engineers found that the length of the query was expended beyond normal length by one of the “query expansion routines”.


    Technical Action Items and Preventive Measures

    Ex Libris has taken the following action and preventive measures to avoid such an occurrence in future:

    • Ex Libris engineers restarted the search server nodes to clear the memory which caused the intermittent service
    • A fix that resolves the defect in the query expansion routines to ensure they do not expand beyond a controlled size, was deployed as part of November release

    Customer Communication

    ExLibris is committed to providing customers with prompt and ongoing updates during Cloud events. Ongoing and prompt updates on service interruptions appear in the system status portal at this address:

    These updates are automatically sent as emails to registered customers.

    Publication History

    Date Publication History
    November 6, 2018 Initial Publication