2021.4 Migration Guide

This release introduces new features, performance improvements, and bug fixes. There are no database migrations included in this release.

Improved Resource Management in Redis Connection Pool

We identified that the Redis connection pool used for caching rendered images was suspect to socket leak when PSPDFKit Server was under high load. This release fixes that issue. We recommend upgrading all installations that use Redis as soon as possible.

Extended Monitoring

The PSPDFKit Server healthcheck endpoint now also includes a check of S3 and Redis connectivity. In addition, Server logs now include document ID and layer name metadata, which allows you to identify if certain issues occur only for specific documents.

Other Changes

This release includes many more improvements. For a full list of changes, check out the Server changelog.

Migrate PSPDFKit for Web

For more information, please take a look at the PSPDFKit for Web 2021.4 Migration Guide.