[ACCUMULO-4041] Java reflection eats too much CPU

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.7.0
• Fix Version/s: 1.6.5, 1.7.1, 1.8.0
• Component/s: tserver

Environment

Ubuntu 15.10, jdk1.8.0_60

• Assignee: Eric C. Newton
• Reporter: Volth
• Created: 28/Oct/15 16:00
• Updated: 13/Nov/15 20:45
• Resolved: 13/Nov/15 20:45

Description

This is called so many times that it eats too much CPU, even more than the snappy compressor: http://i.imgur.com/vqX4pFi.png
Perhaps the annotation data should be copied into regular variables which can be accessed without reflection.

• org.apache.accumulo.core.client.impl.Tables.getZooCache()
• org.apache.accumulo.server.client.HdfsZooInstance.getZooKeepersSessionTimeOut()
• org.apache.accumulo.core.conf.AccumuloConfiguration.getTimeInMillis()
• org.apache.accumulo.core.conf.SiteConfiguration.get()
• org.apache.accumulo.core.conf.Property.isSensitive()
• org.apache.accumulo.core.conf.Property.hasAnnotation()
• java.lang.Class.getField()

Issue Links

• is related to: ACCUMULO-3033 SiteConfiguration gets invoked frequently and scans all configuration items
• relates to: ACCUMULO-4048 Regexp in org.apache.accumulo.core.conf.PropertyType.isValidFormat() eats too much CPU