NEWS

This file describes changes in recent versions of Slurm. It primarily
documents those changes that are of interest to users and administrators.

* Changes in Slurm 17.02.5
==========================
 -- Prevent segfault if a job was blocked from running by a QOS that is then
    deleted.
 -- Improve selection of jobs to preempt when there are multiple partitions
    with jobs subject to preemption.
 -- Only set kmem limit when ConstrainKmemSpace=yes is set in cgroup.conf.
 -- Fix bug in task/affinity that could result in slurmd fatal error.
 -- Increase number of jobs that are tracked in the slurmd as finishing at one
    time.
 -- Note when a job finishes in the slurmd to avoid a race when launching a
    batch job takes longer than it takes to finish.
 -- Improve slurmd startup on large systems (> 10000 nodes)
 -- Add LaunchParameters option of cray_net_exclusive to control whether all
    jobs on the cluster have exclusive access to their assigned nodes.

* Changes in Slurm 17.02.4
==========================
 -- Do not attempt to schedule jobs after changing the power cap if there are
    already many active threads.
 -- Job expansion example in FAQ enhanced to demonstrate operation in
    heterogeneous environments.
 -- Prevent scontrol crash when operating on array and no-array jobs at once.
 -- knl_cray plugin: Log incomplete capmc output for a node.
 -- knl_cray plugin: Change capmc parsing of mcdram_pct from string to number.
 -- Remove log files from test20.12.
 -- When rebooting a node and using the PrologFlags=alloc make sure the
    prolog is ran after the reboot.
 -- node_features/knl_generic - If a node is rebooted for a pending job, but
    fails to enter the desired NUMA and/or MCDRAM mode then drain the node and
    requeue the job.
 -- node_features/knl_generic disable mode change unless RebootProgram
    configured.
 -- Add new burst_buffer function bb_g_job_revoke_alloc() to be executed
    if there was a failure after the initial resource allocation. Does not
    release previously allocated resources.
 -- Test if the node_bitmap on a job is NULL when testing if the job's nodes
    are ready.  This will be NULL is a job was revoked while beginning.
 -- Fix incorrect lock levels when testing when job will run or updating a job.
 -- Add missing locks to job_submit/pbs plugin when updating a jobs
    dependencies.
 -- Add support for lua5.3
 -- Add min_memory_per_node|cpu to the job_submit/lua plugin to deal with lua
    not being able to deal with pn_min_memory being a uint64_t.  Scripts are
    urged to change to these new variables avoid issue.  If not set the
    variables will be 'nil'.
 -- Calculate priority correctly when 'nice' is given.
 -- Fix minor typos in the documentation.
 -- node_features/knl_cray: Preserve non-KNL active features if slurmctld
    reconfigured while node boot in progress.
 -- node_features/knl_generic: Do not repeatedly log errors when trying to read
    KNL modes if not KNL system.
 -- Add missing QOS read lock to backfill scheduler.
 -- When doing a dlopen on liblua only attempt the version compiled against.
 -- Fix null-dereference in sreport cluster ulitization when configured with
    memory-leak-debug.
 -- Fix Partition info in 'scontrol show node'. Previously duplicate partition
    names, or Partitions the node did not belong to could be displayed.
 -- Fix it so the backup slurmdbd will take control correctly.
 -- Fix unsafe use of MAX() macro, which could result in problems cleaning up
    accounting plugins in slurmd, or repeat job cancellation attempts in
    scancel.
 -- Fix 'scontrol update reservation duration=unlimited' to set the duration
    to 365-days (as is done elsewhere), rather than 49710 days.
 -- Check if variable given to scontrol show job is a valid jobid.
 -- Fix WithSubAccounts option to not include WithDeleted unless requested.
 -- Prevent a job tested on multiple partitions from being marked
    WHOLE_NODE_USER.
 -- Prevent a race between completing jobs on a user-exclusive node from
    leaving the node owned.
 -- When scheduling take the nodes in completing jobs out of the mix to reduce
    fragmentation.  SchedulerParameters=reduce_completing_frag
 -- For jobs submited to multiple partitions, report the job's earliest start
    time for any partition.
 -- Backfill partitions that use QOS Grp limits to "float" better.
 -- node_features/knl_cray: don't clear configured GRES from non-KNL node.
 -- sacctmgr - prevent segfault in command when a request is denied due
    to a insufficient priviledges.
 -- Add warning about libcurl-devel not being installed during configure.
 -- Streamline job purge by handling file deletion on a separate thread.
 -- Always set RLIMIT_CORE to the maximum permitted for slurmd, to ensure
    core files are created even on non-developer builds.
 -- Fix --ntasks-per-core option/environment variable parsing to set
    the requested value, instead of always setting one.
 -- If trying to cancel a step that hasn't started yet for some reason return
    a good return code.
 -- Fix issue with sacctmgr show where user=''

* Changes in Slurm 17.02.3
==========================
 -- Increase --cpu_bind and --mem_bind field length limits.
 -- Fix segfault when using AdminComment field with job arrays.
 -- Clear Dependency field when all dependencies are satisfied.
 -- Add --array-unique to squeue which will display one unique pending job
    array element per line.
 -- Reset backfill timers correctly without skipping over them in certain
    circumstances.
 -- When running the "scontrol top" command, make sure that all of the user's
    jobs have a priority that is lower than the selected job. Previous logic
    would permit other jobs with equal priority (no jobs with higher priority).
 -- Fix perl api so we always get an allocation when calling Slurm::new().
 -- Fix issue with cleaning up cpuset and devices cgroups when multiple steps
    end at the same time.
 -- Document that PriorityFlags option of DEPTH_OBLIVIOUS precludes the use of
    FAIR_TREE.
 -- Fix issue if an invalid message came in a Slurm daemon/command may abort.
 -- Make it impossible to use CR_CPU* along with CR_ONE_TASK_PER_CORE. The
    options are mutually exclusive.
 -- ALPS - Fix scheduling when ALPS doesn't agree with Slurm on what nodes
    are free.
 -- When removing a partition make sure it isn't part of a reservation.
 -- Fix seg fault if loading attempting to load non-existent burstbuffer plugin.
 -- Fix to backfill scheduling with respect to QOS and association limits. Jobs
    submitted to multiple partitions are most likley to be effected.
 -- sched/backfill: Improve assoc_limit_stop configuration parameter support.
 -- CRAY - Add ansible play and README.
 -- sched/backfill: Fix bug related to advanced reservations and the need to
    reboot nodes to change KNL mode.
 -- Preempt plugins - fix check for 'preempt_youngest_first' option.
 -- Preempt plugins - fix incorrect casts in preempt_youngest_first mode.
 -- Preempt/job_prio - fix incorrect casts in sort function.
 -- Fix to make task/affinity work with ldoms where there are more than 64
    cpus on the node.
 -- When using node_features/knl_generic make it so the slurmd doesn't segfault
    when shutting down.
 -- Fix potential double-xfree() when using job arrays that can lead to
    slurmctld crashing.
 -- Fix priority/multifactor priorities on a slurmctld restart if not using
    accounting_storage/[mysql|slurmdbd].
 -- Fix NULL dereference reported by CLANG.
 -- Update proctrack documentation to strongly encourage use of
    proctrack/cgroup.
 -- Fix potential memory leak if job fails to begin after nodes have been
    selected for a job.
 -- Handle a job that made it out of the select plugin without a job_resrcs
    pointer.
 -- Fix potential race condition when persistent connections are being closed at
    shutdown.
 -- Fix incorrect locks levels when submitting a batch job or updating a job
    in general.
 -- CRAY - Move delay waiting for job cleanup to after we check once.
 -- MYSQL - Fix memory leak when loading archived jobs into the database.
 -- Fix potential race condition when starting the priority/multifactor plugin's
    decay thread.
 -- Sanity check to make sure we have started a job in acct_policy.c before we
    clear it as started.
 -- Allow reboot program to use arguments.
 -- Message Aggr - Remove race condition on slurmd shutdown with respects to
    destroying a mutex.
 -- Fix updating job priority on multiple partitions to be correct.
 -- Don't remove admin comment when updating a job.
 -- Return error when bad separator is given for scontrol update job licenses.

* Changes in Slurm 17.02.2
==========================
 -- Update hyperlink to LBNL Node Health Check program.
 -- burst_buffer/cray - Add support for line continuation.
 -- If a job is cancelled by the user while it's allocated nodes are being
    reconfigured (i.e. the capmc_resume program is rebooting nodes for the job)
    and the node reconfiguration fails (i.e. the reboot fails), then don't
    requeue the job but leave it in a cancelled state.
 -- capmc_resume (Cray resume node script) - Do not disable changing a node's
    active features if SyscfgPath is configured in the knl.conf file.
 -- Improve the srun documentation for the --resv-ports option.
 -- burst_buffer/cray - Fix parsing for discontinuous allocated nodes. A job
    allocation of "20,22" must be expressed as "20\n22".
 -- Fix rare segfault when shutting down slurmctld and still sending data to
    the database.
 -- Fix gres output of a job if it is updated while pending to be displayed
    correctly with Slurm tools.
 -- Fix pam_slurm_adopt.
 -- Fix missing unlock when job_list doesn't exist when starting priority/
    multifactor.
 -- Fix segfault if slurmctld is shutting down and the slurmdbd plugin was
    in the middle of setting db_indexes.
 -- Add ESLURM_JOB_SETTING_DB_INX to errno to note when a job can't be updated
    because the dbd is setting a db_index.
 -- Fix possible double insertion into database when a job is updated at the
    moment the dbd is assigning a db_index.
 -- Fix memory error when updating a job's licenses.
 -- Fix seff to work correctly with non-standard perl installs.
 -- Export missing slurmdbd_defs_[init|fini] needed for libslurmdb.so to work.
 -- Fix sacct from returning way more than requested when querying against a job
    array task id.
 -- Fix double read lock of tres when updating gres or licenses on a job.
 -- Make sure locks are always in place when calling
    assoc_mgr_make_tres_str_from_array.
 -- Prevent slurmctld SEGV when creating reservation with duplicated name.
 -- Consider QOS flags Partition[Min|Max]Nodes when doing backfill.
 -- Fix slurmdbd_defs.c to not have half symbols go to libslurm.so and the
    other half go to libslurmdb.so.
 -- Fix 'scontrol show jobs' to remove an errant newline when 'Switches' is
    printed.
 -- Better code for handling memory required by a task on a heterogeneous
    system.
 -- Fix regression in 17.02.0 with respects to GrpTresMins on a QOS or
    Association.