We are happy to announce the release of Pegasus 5.1.1. It is a minor release on top of Pegasus 5.1.0 which is a major release of Pegasus. It also includes all features and bug fixes from the 5.0 branch. We invite our users to give it a try.

We recommend that users upgrade to 5.1.1 and not 5.1.0 because 5.1.1 has a fix for #2113 .

The release can be downloaded from: https://pegasus.isi.edu/downloads

If you are an existing user, please carefully follow these instructions to upgrade at https://pegasus.isi.edu/docs/5.1.1/user-guide/migration.html#migrating-from-pegasus-5-0-x-to-pegasus-5-1

Highlights of the Release

1. Refined Data Transfer Mechanisms for Containerized Jobs

   PegasusLite now offers two distinct approaches for handling data transfers in
   containerized jobs. The shift to host-based transfers as the default aims to simplify workflows and minimize the overhead
   associated with customizing container images.

   • Host-Based Transfers (Default in 5.1.0): Input and output data are staged on the host operating system before launching the
     container. This method utilizes pre-installed data transfer tools on the host, reducing the need for additional configurations
     within the container.

   • Container-Based Transfers: Data transfers occur within the container prior to executing user code. This approach requires the
     container image to include necessary data transfer utilities like curl, ftp, or globus-online. Users preferring this method can set
     the property pegasus.transfer.container.onhost to false in their configuration files.

   More details can be found in the documentation.

2. Integration with HTCondor’s Container Universe

   Pegasus 5.1.0 introduces support for HTCondor’s container universe, which is useful in pure HTCondor environments such as
   PATh/OSPool whereby the container management is handled by HTCondor. This integration simplifies job submission and
   execution, for environments where HTCondor’s container universe is available.

   This enhancement builds upon Pegasus’s initial container support introduced in version 4.8.0, reflecting ongoing efforts to
   improve compatibility and user experience.

   More details can be found in the documentation.

3. pegasus-status command line tool was rewritten in python, removing Pegasus perl dependency. The new pegasus-status command has better support for showing status of hierarchical workflows.

4. Improved determination on what site a job runs on. Starting Pegasus 5.1.0 release, PegasusLite wrapped jobs send a location record that enables us to figure out what resource a job runs on. The location record can be found toward the end of the job .out file as a pegasus multipart record.

   More details can be found in the documentation.

5. Please note that RPM packaging for 5.1.x series is not compatible with the 5.0.x series. If you try to update an existing 5.0.x install you will see an error similar to the trace below

   dnf update pegasus
   
   Running transaction check
   Transaction check succeeded.
   Running transaction test
   The downloaded packages were saved in cache until the next successful transaction.
   You can remove cached packages by executing 'dnf clean packages'.
   Error: Transaction test error:
    file /usr/lib64/pegasus/python from install of pegasus-5.1.0-1.el8.x86_64 conflicts with file from package pegasus-5.0.9.1.el8.x86_64
   

   The recommended way is to first remove the 5.0.x install and then do the install.

New Features and Improvements

update deployment scenarios documentation to include Open OnDemand configuration #2112

Incorporate release notes into the documentation #2111

document use of containers on HPC clusters #2110

update planner worker package staging logic to default to rhel8 for linux and macos_14 for macos #2108

planner should try and visualize the workflow #2099

CVE-2025-21502 in RHEL 8 project dependency java-11-openjdk #2097

Failures when testing pegasus v5.1.0 release #2095

Improved determination of what resource the job ran on #2094

add support in pegasus-init for submission to remote SLURM cluster via SSH #2093

[PM-1999] pick automatically system executables on the local site on the basis of what PATH is set when running the planner #2091

[PM-1975] enable bypass staging of container when running in container universe #2081

[PM-1971] Update jars that have security vulnerabilities. #2077

[PM-1970] Storage constraint test failing #2076

[PM-1969] Schema doc should be for YAML and not XML #2075

[PM-1956] p-version timestamp issue #2069

[PM-1950] enable users to use container universe when running containerized jobs in pure condor environments #2063

[PM-1942] Support transfers for a job on the HOST OS instead of from within the container #2055

[PM-1901] converting pegasus-analyzer tool to API (like status) and add test suite #2014

[PM-1889] Escape command line args passed to Job #2002

[PM-1886] Recommendations for new Pegasus-Status CLI tool #1999

[PM-1882] replace the perl command line client with python client #1995

[PM-1881] remove dependency on pegasus-status command line tool , in the Workflow status function #1994

[PM-1775] add changes to the Python API to support adding of checkpoint files by pattern #1889

[PM-1589] Example workflows repository for 5.0 #1703

[PM-1974] update InPlace cleanup algorithm to delete container image from the user submit directory #2080

[PM-1967] Kickstart should kill a job gracefully before maxwalltime #2073

[PM-1955] Deprecate R API #2068

[PM-1934] source builds with multiple python3 installs #2047

[PM-1915] Convert pegasus-statistics tool to API and add test suite #2028

[PM-1914] update python workflow api to support arm64 #2027

[PM-1912] planner should keep in mind units when converting diskspace profiles #2025

[PM-1860] aws batch support needs to pick up credentials.conf correctly #1973

[PM-1819] 5.0.3 Python API Improvements #1932

[PM-1801] sqlalchemy warnings against 5.0 database #1915

[PM-1793] refactor pegasus-transfer so that it can be invoked directly from pegasus-checkpoint #1907

[PM-1782] incorporate pegasus arm builds into our build infrastructure #1896

[PM-1781] pegasus-keg sleep option #1895

[PM-1756] paths with spaces need to be escaped #1870

[PM-1690] the –json option added in pegasus-plan/run needs to be integrated into the python api client code #1804

Bugs Fixed

snakeyaml version version 1.32, used by Jackson 2.14 has an in-built circuit breaker that breaks parsing for large yaml documents #2113

pegasus aws batch test failing because of urllib3 incompatibility #2107

Planner should catch deep lfn common name problem when using CEDAR #2106

support for condorio deep LFN broke after move to host OS based transfers #2105

when parsing container mount points in the TC, normalize the path to ensure any duplicate / in directory paths are removed #2103

pegasus-graphviz fails on a wf generated with java dax api that has no jobs #2101

[PM-1954] Importing six.moves raises ModuleNotFoundError on Python 3.12 #2067

[PM-1968] pegasus.gridstart allows values that are not documented #2074

[PM-1952] Local universe job fail with pegasus.transfer.bypass.input.staging = true #2065

[PM-1924] API submit still drops debug info to stdout #2037

[PM-1902] Pika problem on RHEL 9 - Bump the version to 1.2.1 also #2015

[PM-1923] download form does not send metrics to metric server #2036

PM-1874 More test fixes and updates #43 (zaiyan-alam)

test updates and python3 fixes #42 (zaiyan-alam)

Test updates #41 (zaiyan-alam)

PM-1874 gsiftp test updates #40 (zaiyan-alam)