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ARC 6.4.1
The Advanced Resource Connector (ARC) middleware is an Open Source software solution to enable distributed computing infrastructures with the emphasis on processing large volumes of data. ARC provides an abstraction layer over computational resources, complete with input and output data movement functionalities. The security model of ARC is identical to that of Grid solutions, relying on delegation of user credentials and the concept of Virtual Organisations. ARC also provides client tools, as well as API in C++, Python and Java.
Release notes
We are happy to announce the ARC 6.3.0 release, which includes some bugfixes and smaller enhancements to 6.2.0.
As no larger new features are added in this release, the main highlights are the fixing of some annoying bugs:
- A bug sometimes causing arex to stop job processing after logrotate is fixed (3857).
- Also fixed is the failure to clean the session directory when the session directory is nfs mounted with no_root_squash (3855).
- Some systems encountered an increasing amount of left-over hanging arched processes which eventually caused the ARC server to run out of memory. This should be fixed since now the DMC is run in a separate process. (3830).
- The way SLURM handles environment variables caused failure in ENV/PROXY updates. A workaround was provided for ARC 6.1 through arc.conf by setting slurm_requirements=--export=None in the [lrms] block. Now this workaround is no longer needed as the backend script is fixed.
We would like to mention a highlight from release 6.2.0 which unfortunately missed the highlights at the time: Starting from 6.2 it is possible to measure job resource usage on worker nodes using cgroups. This option provides precise accounting measurements and is enabled automatically when the arc-job-cgroup tool is installed on the worker node (part of the new nordugrid-arc-wn package). Please see the Measuring accounting metrics of the job documentation for more details.
Finally looking ahead to 6.4.0: ARC 6.3.0 will be the last release with the current accounting implementation. If you want to know what is awaiting you, please head over to the ARC Next Generation Accounting documentation.
For more details, please look at the full release notes.
Future Support of ARC 5-series
Now that ARC 6 is released, we will only provide security updates of ARC 5.
In particular:
- No new feature development is planned or going on for ARC5 and no bug-fixing development will happen on ARC5 code base in the future except for security issues.
- Security fixes for ARC5 will be provided till end of June 2020.
- Production Sites already running ARC 5 will be able to get deployment and configuration troubleshooting help via GGUS till end June 2021. This we call "operational site support".
- ARC5 is available in EPEL7 and will stay there. EPEL8 will only contain ARC 6.
davix 0.7.5
davix is a C++ toolkit for advanced I/O on remote resources with HTTP based protocols.
Release notes:
dCache 5.2.6
dCache provides a system for storing and retrieving huge amounts of data, distributed among a large number of heterogeneous server nodes, under a single virtual filesystem tree with a variety of standard access methods.
Detailed release notes on the official product site: https://www.dcache.org/downloads/1.9/release-notes-5.2.shtml