Poor Performance With NIO Based Caches Using Filesystem Based Storage For Backups in a Virtualized Environment with Network Based Storage (Doc ID 1589614.1)

Last updated on NOVEMBER 03, 2016

Applies to:

Oracle Coherence - Version 3.7.1.9 and later
Information in this document applies to any platform.

Symptoms

Coherence is deployed in a cluster running on virtual machines whose virtual disks were based on network attached shared storage. 

The Coherence Service Guardian reports soft and hard timeouts for the configured distributed cache.  Here is the soft timeout thread stack for the stuck cache service thread which shows it using Java NIO to make space for a backup map:

 

Changes

The original configuration did not have any backup storage configured, that is the backup-count was 0.  The issue started to occur once the filesystem based backup storage was added.

Cause

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