[ https://issues.apache.org/jira/browse/CASSANDRA-14085?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Andrew Whang updated CASSANDRA-14085: ------------------------------------- Fix Version/s: 4.0 3.0.16 Status: Patch Available (was: Open) https://github.com/whangsf/cassandra/commit/2ae3589ce9eefd8699bbd4e29bf1c61a486d394e > Excessive update of ReadLatency metric in digest calculation > ------------------------------------------------------------ > > Key: CASSANDRA-14085 > URL: https://issues.apache.org/jira/browse/CASSANDRA-14085 > Project: Cassandra > Issue Type: Bug > Components: Metrics > Reporter: Andrew Whang > Priority: Minor > Fix For: 3.0.16, 4.0 > > > We noticed an increase in read latency after upgrading to 3.x, specifically > for requests with CL>ONE. It turns out the read latency metric is being > doubly updated for digest calculations. This code > (https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/db/partitions/UnfilteredPartitionIterators.java#L243) > makes an improper copy of an iterator that's wrapped by MetricRecording, > whose onClose() records the latency of the execution. -- This message was sent by Atlassian JIRA (v6.4.14#64029) --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org For additional commands, e-mail: commits-h...@cassandra.apache.org