Hawkular Metrics 0.19.0 发布

Hawkular Metrics 0.19.0 发布了，该版本在性能和REST API方面做了全面的增强，主要包括：

1. REST API - Query Improvements

• It is now possible to use relative timestamps when querying for data via + or - added to timestamp parameters. When used, the timestamp is relative to the local system timestamp (HWKMETRICS-358, HWKMETRICS-457)

• Querying for data from earliest available data point has been expanded to raw data queries for gauges and counters (HWKMETRICS-435)

• DELETE tenants/{id} has been added to allow the deletion of an entire tenant (HWKMETRICS-446)

• AvailabilityType is serialized as simple string in bucket data points (HWKMETRICS-436)

• The write performance has been increased by 10% across the board after reorganizing the meta-data internal indexes. (HWKMETRICS-422)

• GZIP replaced LZ4 as the compression algorithm for the data table. This produces anywhere between 60% to 70% disk usage savings over LZ4. (HWKMETRICS-454)

• The newly introduced internal job scheduler received several improvements and fixes; the main focus was to enhance the scalability and fault tolerance.

• The job scheduler will be used only for internal tasks.

• For more details: HWKMETRICS-221, HWKMETRICS-451, HWKMETRICS-453, HWKMETRICS-94

Hawkular Metrics Clients

• Python: https://github.com/hawkular/hawkular-client-python

• Go: https://github.com/hawkular/hawkular-client-go

• Ruby: https://github.com/hawkular/hawkular-client-ruby

• Java: https://github.com/hawkular/hawkular-client-java

Release Links

• Github Release: https://github.com/hawkular/hawkular-metrics/releases/tag/0.19.0

• JBoss Nexus Maven artifacts: http://origin-repository.jboss.org/nexus/content/repositories/public/org/hawkular/metrics/

• Jira release tracker: https://issues.jboss.org/browse/HWKMETRICS/fixforversion/12331192