eliminate duplicate KVS restart in job-list and job-manager

doc/man5/flux-config-job-manager.rst

@@ -13,11 +13,6 @@ table, which may contain the following keys:
 KEYS
 ====
 
-journal-size-limit
-   (optional) Integer value that determines the maximum number of job events to
-   be retained in the in-memory journal used to answer queries.  The default
-   is 1000.
-
 inactive-age-limit
    (optional) String (in RFC 23 Flux Standard Duration format) that specifies
    the maximum age of inactive jobs retained in the KVS.  The age is computed

src/modules/job-list/job-list.c

@@ -43,6 +43,13 @@
                       const flux_msg_t *msg, void *arg)
 {
     struct list_ctx *ctx = arg;
+
+    if (!ctx->jsctx->initialized) {
+        if (flux_msglist_append (ctx->deferred_requests, msg) < 0)
+            goto error;
+        return;
+    }
+
     int pending = zlistx_size (ctx->jsctx->pending);
     int running = zlistx_size (ctx->jsctx->running);
     int inactive = zlistx_size (ctx->jsctx->inactive);
@@ -57,15 +64,12 @@
                            "idsync",
                            "lookups", idsync_lookups,
                            "waits", idsync_waits,
-                           "stats_watchers", stats_watchers) < 0) {
-        flux_log_error (h, "%s: flux_respond_pack", __FUNCTION__);
-        goto error;
-    }
-
+                           "stats_watchers", stats_watchers) < 0)
+        flux_log_error (h, "error responding to stats-get request");
     return;
 error:
     if (flux_respond_error (h, msg, errno, NULL) < 0)
-        flux_log_error (h, "%s: flux_respond_error", __FUNCTION__);
+        flux_log_error (h, "error responding to stats-get request");
 }
 
 static void purge_cb (flux_t *h,
@@ -98,6 +102,17 @@
     flux_log (h, LOG_DEBUG, "purged %d inactive jobs", count);
 }
 
+void requeue_deferred_requests (struct list_ctx *ctx)
+{
+    const flux_msg_t *msg;
+
+    while ((msg = flux_msglist_pop (ctx->deferred_requests))) {
+        if (flux_requeue (ctx->h, msg, FLUX_RQ_TAIL) < 0)
+            flux_log_error (ctx->h, "error requeuing deferred request");
+        flux_msg_decref (msg);
+    }
+}
+
 static void disconnect_cb (flux_t *h,
                            flux_msg_handler_t *mh,
                            const flux_msg_t *msg,
@@ -186,6 +201,7 @@
     if (ctx) {
         int saved_errno = errno;
         flux_msg_handler_delvec (ctx->handlers);
+        flux_msglist_destroy (ctx->deferred_requests);
         if (ctx->jsctx)
             job_state_destroy (ctx->jsctx);
         if (ctx->isctx)
@@ -207,7 +223,9 @@
         goto error;
     if (!(ctx->isctx = idsync_ctx_create (ctx->h)))
         goto error;
-    if (!(ctx->jsctx = job_state_create (ctx->isctx)))
+    if (!(ctx->jsctx = job_state_create (ctx)))
+        goto error;
+    if (!(ctx->deferred_requests = flux_msglist_create ()))
         goto error;
     return ctx;
 error:
@@ -224,10 +242,6 @@
         flux_log_error (h, "initialization error");
         goto done;
     }
-    if (job_state_init_from_kvs (ctx->jsctx) < 0) {
-        flux_log_error (h, "initialization from kvs error");
-        goto done;
-    }
     if (flux_reactor_run (flux_get_reactor (h), 0) < 0)
         goto done;
     rc = 0;

src/modules/job-list/job-list.h

@@ -23,10 +23,13 @@ struct list_ctx {
     flux_msg_handler_t **handlers;
     struct job_state_ctx *jsctx;
     struct idsync_ctx *isctx;
+    struct flux_msglist *deferred_requests;
 };
 
 const char **job_attrs (void);
 
+void requeue_deferred_requests (struct list_ctx *ctx);
+
 #endif /* _FLUX_JOB_LIST_H */
 
 /*

src/modules/job-list/job_data.c

@@ -42,7 +42,6 @@
         json_decref (job->exception_context);
         json_decref (job->jobspec_updates);
         json_decref (job->R_updates);
-        zlist_destroy (&job->updates);
         free (job);
         errno = save_errno;
     }
@@ -69,16 +68,8 @@
     job->expiration = -1.0;
     job->wait_status = -1;
     job->result = FLUX_JOB_RESULT_FAILED;
-
-    if (!(job->updates = zlist_new ())) {
-        errno = ENOMEM;
-        job_destroy (job);
-        return NULL;
-    }
-
     job->states_mask = FLUX_JOB_STATE_NEW;
     job->states_events_mask = FLUX_JOB_STATE_NEW;
-    job->eventlog_seq = -1;
     return job;
 }
 
@@ -368,15 +359,24 @@
     return allow_nonfatal ? 0 : -1;
 }
 
-int job_parse_jobspec (struct job *job, const char *s, json_t *updates)
+int job_parse_jobspec_cached (struct job *job, json_t *updates)
 {
-    if (load_jobspec (job, s, true) < 0)
+    if (!job->jobspec) {
+        errno = EINVAL;
         return -1;
+    }
     if (parse_jobspec (job, true) < 0)
         return -1;
     return job_jobspec_update (job, updates);
 }
 
+int job_parse_jobspec (struct job *job, const char *s, json_t *updates)
+{
+    if (load_jobspec (job, s, true) < 0)
+        return -1;
+    return job_parse_jobspec_cached (job, updates);
+}
+
 int job_parse_jobspec_fatal (struct job *job, const char *s, json_t *updates)
 {
     if (load_jobspec (job, s, false) < 0)
@@ -466,15 +466,24 @@
     return rc;
 }
 
-int job_parse_R (struct job *job, const char *s, json_t *updates)
+int job_parse_R_cached (struct job *job, json_t *updates)
 {
-    if (load_R (job, s, true) < 0)
+    if (!job->R) {
+        errno = EINVAL;
         return -1;
+    }
     if (parse_R (job, true) < 0)
         return -1;
     return job_R_update (job, updates);
 }
 
+int job_parse_R (struct job *job, const char *s, json_t *updates)
+{
+    if (load_R (job, s, true) < 0)
+        return -1;
+    return job_parse_R_cached (job, updates);
+}
+
 int job_parse_R_fatal (struct job *job, const char *s, json_t *updates)
 {
     if (load_R (job, s, false) < 0)

src/modules/job-list/job_data.h

@@ -70,27 +70,17 @@ struct job {
     json_t *R;
     json_t *exception_context;
 
-    /* All internal changes (most notably job state transitions) are
-     * placed on the updates list.  We do not immediately update to
-     * the new state and place onto a new list until we have retrieved
-     * any necessary data associated to that state.  For example, when
-     * the 'depend' state has been seen, we don't immediately place it
-     * on the `pending` list.  We wait until we've retrieved data such
-     * as userid, urgency, etc.
-     *
-     * Track which states we have seen and have completed transition
+    /* Track which states we have seen and have completed transition
      * to.  States we've processed via the states_mask and states seen
      * via events stream in states_events_mask.
      */
-    zlist_t *updates;
     unsigned int states_mask;
     unsigned int states_events_mask;
     void *list_handle;
-    /* if updates in eventlog before jobspec / R read from KVS */
+    /* store updates that were received before jobspec/R objects */
     json_t *jobspec_updates;
     json_t *R_updates;
 
-    int eventlog_seq;           /* last event seq read */
     int submit_version;         /* version number in submit context */
 };
 
@@ -110,6 +100,7 @@ struct job *job_create (flux_t *h, flux_jobid_t id);
  * the jobspec.
  */
 int job_parse_jobspec (struct job *job, const char *s, json_t *updates);
+int job_parse_jobspec_cached (struct job *job, json_t *updates);
 
 /* identical to above, but all nonfatal errors will return error.
  * Primarily used for testing.
@@ -129,6 +120,7 @@ int job_jobspec_update (struct job *job, json_t *updates);
  * - ntasks (if necessary)
  */
 int job_parse_R (struct job *job, const char *s, json_t *updates);
+int job_parse_R_cached (struct job *job, json_t *updates);
 
 /* identical to above, but all nonfatal errors will return error.
  * Primarily used for testing.