Troubleshooting
Problem
Large reference sets that are not tuned and maintained, can lead to warnings related to hash collisions and may have a negative performance impact on event processing.
Symptom
Performance degradation notifications are seen under System Notifications. Look for similar warnings logged to the /var/log/qradar.log file on the console or the Event Processor:
May 11 09:27:56 ::ffff:xx.xx.xx.xx [tomcat.tomcat] [Token: TAXII Feeds@xx.xx.xx.xx (11268732) /console/restapi/api/reference_data/sets/bulk_load/XFE%2520Default%2520Feeds] com.q1labs.frameworks.cache.ChainAppendCache: [WARN] [NOT:0000004000][xx.xx.xx.xx/- -] [-/- -]RefData_57_domain_2147483647 is experiencing heavy COLLISIONS exceeding configured threshold (this may have negative performance impact) threshold = 5.0 average collisions = 10.0Document Location
Worldwide
[{"Line of Business":{"code":"LOB77","label":"Automation Platform"},"Business Unit":{"code":"BU048","label":"IBM Software"},"Product":{"code":"SSBQAC","label":"IBM Security QRadar SIEM"},"ARM Category":[{"code":"a8m0z000000cwtiAAA","label":"Performance"}],"ARM Case Number":"","Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"All Version(s)"}]
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Document Information
Modified date:
01 October 2020
UID
ibm16335163