/**
* collectd - src/plugin.c
- * Copyright (C) 2005-2011 Florian octo Forster
+ * Copyright (C) 2005-2013 Florian octo Forster
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
**/
#include "collectd.h"
-#include "utils_complain.h"
-
-#include <ltdl.h>
-
-#if HAVE_PTHREAD_H
-# include <pthread.h>
-#endif
-
#include "common.h"
#include "plugin.h"
#include "configfile.h"
+#include "filter_chain.h"
#include "utils_avltree.h"
+#include "utils_cache.h"
+#include "utils_complain.h"
#include "utils_llist.h"
#include "utils_heap.h"
-#include "utils_cache.h"
-#include "filter_chain.h"
+#include "utils_time.h"
+
+#if HAVE_PTHREAD_H
+# include <pthread.h>
+#endif
+
+#include <ltdl.h>
/*
* Private structures
char rf_group[DATA_MAX_NAME_LEN];
char rf_name[DATA_MAX_NAME_LEN];
int rf_type;
- struct timespec rf_interval;
- struct timespec rf_effective_interval;
- struct timespec rf_next_read;
+ cdtime_t rf_interval;
+ cdtime_t rf_effective_interval;
+ cdtime_t rf_next_read;
};
typedef struct read_func_s read_func_t;
+struct write_queue_s;
+typedef struct write_queue_s write_queue_t;
+struct write_queue_s
+{
+ value_list_t *vl;
+ plugin_ctx_t ctx;
+ write_queue_t *next;
+};
+
/*
* Private variables
*/
static pthread_t *read_threads = NULL;
static int read_threads_num = 0;
+static write_queue_t *write_queue_head;
+static write_queue_t *write_queue_tail;
+static _Bool write_loop = 1;
+static pthread_mutex_t write_lock = PTHREAD_MUTEX_INITIALIZER;
+static pthread_cond_t write_cond = PTHREAD_COND_INITIALIZER;
+static pthread_t *write_threads = NULL;
+static size_t write_threads_num = 0;
+
static pthread_key_t plugin_ctx_key;
static _Bool plugin_ctx_key_initialized = 0;
/*
* Static functions
*/
+static int plugin_dispatch_values_internal (value_list_t *vl);
+
static const char *plugin_get_dir (void)
{
if (plugindir == NULL)
return (0);
}
-static _Bool timeout_reached(struct timespec timeout)
-{
- struct timeval now;
- gettimeofday(&now, NULL);
- return (now.tv_sec >= timeout.tv_sec && now.tv_usec >= (timeout.tv_nsec / 1000));
-}
-
static void *plugin_read_thread (void __attribute__((unused)) *args)
{
while (read_loop != 0)
}
pthread_mutex_unlock (&read_lock);
- if ((rf->rf_interval.tv_sec == 0) && (rf->rf_interval.tv_nsec == 0))
+ if (rf->rf_interval == 0)
{
/* this should not happen, because the interval is set
* for each plugin when loading it
* XXX: issue a warning? */
- now = cdtime ();
-
- CDTIME_T_TO_TIMESPEC (plugin_get_interval (), &rf->rf_interval);
-
+ rf->rf_interval = plugin_get_interval ();
rf->rf_effective_interval = rf->rf_interval;
- CDTIME_T_TO_TIMESPEC (now, &rf->rf_next_read);
+ rf->rf_next_read = cdtime ();
}
/* sleep until this entry is due,
* pthread_cond_timedwait returns. */
rc = 0;
while ((read_loop != 0)
- && !timeout_reached(rf->rf_next_read)
+ && (cdtime () < rf->rf_next_read)
&& rc == 0)
{
+ struct timespec ts = { 0 };
+
+ CDTIME_T_TO_TIMESPEC (rf->rf_next_read, &ts);
+
rc = pthread_cond_timedwait (&read_cond, &read_lock,
- &rf->rf_next_read);
+ &ts);
}
/* Must hold `read_lock' when accessing `rf->rf_type'. */
* intervals in which it will be called. */
if (status != 0)
{
- rf->rf_effective_interval.tv_sec *= 2;
- rf->rf_effective_interval.tv_nsec *= 2;
- NORMALIZE_TIMESPEC (rf->rf_effective_interval);
-
- if (rf->rf_effective_interval.tv_sec >= 86400)
- {
- rf->rf_effective_interval.tv_sec = 86400;
- rf->rf_effective_interval.tv_nsec = 0;
- }
+ rf->rf_effective_interval *= 2;
+ if (rf->rf_effective_interval > TIME_T_TO_CDTIME_T (86400))
+ rf->rf_effective_interval = TIME_T_TO_CDTIME_T (86400);
NOTICE ("read-function of plugin `%s' failed. "
- "Will suspend it for %i seconds.",
+ "Will suspend it for %.3f seconds.",
rf->rf_name,
- (int) rf->rf_effective_interval.tv_sec);
+ CDTIME_T_TO_DOUBLE (rf->rf_effective_interval));
}
else
{
now = cdtime ();
DEBUG ("plugin_read_thread: Effective interval of the "
- "%s plugin is %i.%09i.",
+ "%s plugin is %.3f seconds.",
rf->rf_name,
- (int) rf->rf_effective_interval.tv_sec,
- (int) rf->rf_effective_interval.tv_nsec);
+ CDTIME_T_TO_DOUBLE (rf->rf_effective_interval));
/* Calculate the next (absolute) time at which this function
* should be called. */
- rf->rf_next_read.tv_sec = rf->rf_next_read.tv_sec
- + rf->rf_effective_interval.tv_sec;
- rf->rf_next_read.tv_nsec = rf->rf_next_read.tv_nsec
- + rf->rf_effective_interval.tv_nsec;
- NORMALIZE_TIMESPEC (rf->rf_next_read);
+ rf->rf_next_read += rf->rf_effective_interval;
/* Check, if `rf_next_read' is in the past. */
- if (TIMESPEC_TO_CDTIME_T (&rf->rf_next_read) < now)
+ if (rf->rf_next_read < now)
{
/* `rf_next_read' is in the past. Insert `now'
* so this value doesn't trail off into the
* past too much. */
- CDTIME_T_TO_TIMESPEC (now, &rf->rf_next_read);
+ rf->rf_next_read = now;
}
- DEBUG ("plugin_read_thread: Next read of the %s plugin at %i.%09i.",
+ DEBUG ("plugin_read_thread: Next read of the %s plugin at %.3f.",
rf->rf_name,
- (int) rf->rf_next_read.tv_sec,
- (int) rf->rf_next_read.tv_nsec);
+ CDTIME_T_TO_DOUBLE (rf->rf_next_read));
/* Re-insert this read function into the heap again. */
c_heap_insert (read_heap, rf);
read_threads_num = 0;
} /* void stop_read_threads */
+static void plugin_value_list_free (value_list_t *vl) /* {{{ */
+{
+ if (vl == NULL)
+ return;
+
+ meta_data_destroy (vl->meta);
+ sfree (vl->values);
+ sfree (vl);
+} /* }}} void plugin_value_list_free */
+
+static value_list_t *plugin_value_list_clone (value_list_t const *vl_orig) /* {{{ */
+{
+ value_list_t *vl;
+
+ if (vl_orig == NULL)
+ return (NULL);
+
+ vl = malloc (sizeof (*vl));
+ if (vl == NULL)
+ return (NULL);
+ memcpy (vl, vl_orig, sizeof (*vl));
+
+ vl->values = calloc (vl_orig->values_len, sizeof (*vl->values));
+ if (vl->values == NULL)
+ {
+ plugin_value_list_free (vl);
+ return (NULL);
+ }
+ memcpy (vl->values, vl_orig->values,
+ vl_orig->values_len * sizeof (*vl->values));
+
+ vl->meta = meta_data_clone (vl->meta);
+ if ((vl_orig->meta != NULL) && (vl->meta == NULL))
+ {
+ plugin_value_list_free (vl);
+ return (NULL);
+ }
+
+ if (vl->time == 0)
+ vl->time = cdtime ();
+
+ /* Fill in the interval from the thread context, if it is zero. */
+ if (vl->interval == 0)
+ {
+ plugin_ctx_t ctx = plugin_get_ctx ();
+
+ if (ctx.interval != 0)
+ vl->interval = ctx.interval;
+ else
+ {
+ char name[6 * DATA_MAX_NAME_LEN];
+ FORMAT_VL (name, sizeof (name), vl);
+ ERROR ("plugin_value_list_clone: Unable to determine "
+ "interval from context for "
+ "value list \"%s\". "
+ "This indicates a broken plugin. "
+ "Please report this problem to the "
+ "collectd mailing list or at "
+ "<http://collectd.org/bugs/>.", name);
+ vl->interval = cf_get_default_interval ();
+ }
+ }
+
+ return (vl);
+} /* }}} value_list_t *plugin_value_list_clone */
+
+static int plugin_write_enqueue (value_list_t const *vl) /* {{{ */
+{
+ write_queue_t *q;
+
+ q = malloc (sizeof (*q));
+ if (q == NULL)
+ return (ENOMEM);
+ q->next = NULL;
+
+ q->vl = plugin_value_list_clone (vl);
+ if (q->vl == NULL)
+ {
+ sfree (q);
+ return (ENOMEM);
+ }
+
+ /* Store context of caller (read plugin); otherwise, it would not be
+ * available to the write plugins when actually dispatching the
+ * value-list later on. */
+ q->ctx = plugin_get_ctx ();
+
+ pthread_mutex_lock (&write_lock);
+
+ if (write_queue_tail == NULL)
+ {
+ write_queue_head = q;
+ write_queue_tail = q;
+ }
+ else
+ {
+ write_queue_tail->next = q;
+ write_queue_tail = q;
+ }
+
+ pthread_cond_signal (&write_cond);
+ pthread_mutex_unlock (&write_lock);
+
+ return (0);
+} /* }}} int plugin_write_enqueue */
+
+static value_list_t *plugin_write_dequeue (void) /* {{{ */
+{
+ write_queue_t *q;
+ value_list_t *vl;
+
+ pthread_mutex_lock (&write_lock);
+
+ while (write_loop && (write_queue_head == NULL))
+ pthread_cond_wait (&write_cond, &write_lock);
+
+ if (write_queue_head == NULL)
+ {
+ pthread_mutex_unlock (&write_lock);
+ return (NULL);
+ }
+
+ q = write_queue_head;
+ write_queue_head = q->next;
+ if (write_queue_head == NULL)
+ write_queue_tail = NULL;
+
+ pthread_mutex_unlock (&write_lock);
+
+ (void) plugin_set_ctx (q->ctx);
+
+ vl = q->vl;
+ sfree (q);
+ return (vl);
+} /* }}} value_list_t *plugin_write_dequeue */
+
+static void *plugin_write_thread (void __attribute__((unused)) *args) /* {{{ */
+{
+ while (write_loop)
+ {
+ value_list_t *vl = plugin_write_dequeue ();
+ if (vl == NULL)
+ continue;
+
+ plugin_dispatch_values_internal (vl);
+
+ plugin_value_list_free (vl);
+ }
+
+ pthread_exit (NULL);
+ return ((void *) 0);
+} /* }}} void *plugin_write_thread */
+
+static void start_write_threads (size_t num) /* {{{ */
+{
+ size_t i;
+
+ if (write_threads != NULL)
+ return;
+
+ write_threads = (pthread_t *) calloc (num, sizeof (pthread_t));
+ if (write_threads == NULL)
+ {
+ ERROR ("plugin: start_write_threads: calloc failed.");
+ return;
+ }
+
+ write_threads_num = 0;
+ for (i = 0; i < num; i++)
+ {
+ int status;
+
+ status = pthread_create (write_threads + write_threads_num,
+ /* attr = */ NULL,
+ plugin_write_thread,
+ /* arg = */ NULL);
+ if (status != 0)
+ {
+ char errbuf[1024];
+ ERROR ("plugin: start_write_threads: pthread_create failed "
+ "with status %i (%s).", status,
+ sstrerror (status, errbuf, sizeof (errbuf)));
+ return;
+ }
+
+ write_threads_num++;
+ } /* for (i) */
+} /* }}} void start_write_threads */
+
+static void stop_write_threads (void) /* {{{ */
+{
+ write_queue_t *q;
+ int i;
+
+ if (write_threads == NULL)
+ return;
+
+ INFO ("collectd: Stopping %zu write threads.", write_threads_num);
+
+ pthread_mutex_lock (&write_lock);
+ write_loop = 0;
+ DEBUG ("plugin: stop_write_threads: Signalling `write_cond'");
+ pthread_cond_broadcast (&write_cond);
+ pthread_mutex_unlock (&write_lock);
+
+ for (i = 0; i < write_threads_num; i++)
+ {
+ if (pthread_join (write_threads[i], NULL) != 0)
+ {
+ ERROR ("plugin: stop_write_threads: pthread_join failed.");
+ }
+ write_threads[i] = (pthread_t) 0;
+ }
+ sfree (write_threads);
+ write_threads_num = 0;
+
+ pthread_mutex_lock (&write_lock);
+ i = 0;
+ for (q = write_queue_head; q != NULL; )
+ {
+ write_queue_t *q1 = q;
+ plugin_value_list_free (q->vl);
+ q = q->next;
+ sfree (q1);
+ i++;
+ }
+ write_queue_head = NULL;
+ write_queue_tail = NULL;
+ pthread_mutex_unlock (&write_lock);
+
+ if (i > 0)
+ {
+ WARNING ("plugin: %i value list%s left after shutting down "
+ "the write threads.",
+ i, (i == 1) ? " was" : "s were");
+ }
+} /* }}} void stop_write_threads */
+
/*
* Public functions
*/
struct dirent *de;
int status;
- DEBUG ("type = %s", type);
-
dir = plugin_get_dir ();
ret = 1;
status = ssnprintf (typename, sizeof (typename), "%s.so", type);
if ((status < 0) || ((size_t) status >= sizeof (typename)))
{
- WARNING ("snprintf: truncated: `%s.so'", type);
+ WARNING ("plugin_load: Filename too long: \"%s.so\"", type);
return (-1);
}
typename_len = strlen (typename);
if ((dh = opendir (dir)) == NULL)
{
char errbuf[1024];
- ERROR ("opendir (%s): %s", dir,
+ ERROR ("plugin_load: opendir (%s) failed: %s", dir,
sstrerror (errno, errbuf, sizeof (errbuf)));
return (-1);
}
"%s/%s", dir, de->d_name);
if ((status < 0) || ((size_t) status >= sizeof (filename)))
{
- WARNING ("snprintf: truncated: `%s/%s'", dir, de->d_name);
+ WARNING ("plugin_load: Filename too long: \"%s/%s\"",
+ dir, de->d_name);
continue;
}
if (lstat (filename, &statbuf) == -1)
{
char errbuf[1024];
- WARNING ("stat %s: %s", filename,
+ WARNING ("plugin_load: stat (\"%s\") failed: %s",
+ filename,
sstrerror (errno, errbuf, sizeof (errbuf)));
continue;
}
else if (!S_ISREG (statbuf.st_mode))
{
/* don't follow symlinks */
- WARNING ("stat %s: not a regular file", filename);
+ WARNING ("plugin_load: %s is not a regular file.",
+ filename);
continue;
}
- if (plugin_load_file (filename, flags) == 0)
+ status = plugin_load_file (filename, flags);
+ if (status == 0)
{
/* success */
ret = 0;
}
else
{
- fprintf (stderr, "Unable to load plugin %s.\n", type);
+ ERROR ("plugin_load: Load plugin \"%s\" failed with "
+ "status %i.", type, status);
}
}
closedir (dh);
- if (filename[0] == '\0')
- fprintf (stderr, "Could not find plugin %s.\n", type);
+ if (filename[0] == 0)
+ ERROR ("plugin_load: Could not find plugin \"%s\" in %s",
+ type, dir);
return (ret);
}
rf0 = arg0;
rf1 = arg1;
- if (rf0->rf_next_read.tv_sec < rf1->rf_next_read.tv_sec)
+ if (rf0->rf_next_read < rf1->rf_next_read)
return (-1);
- else if (rf0->rf_next_read.tv_sec > rf1->rf_next_read.tv_sec)
- return (1);
- else if (rf0->rf_next_read.tv_nsec < rf1->rf_next_read.tv_nsec)
- return (-1);
- else if (rf0->rf_next_read.tv_nsec > rf1->rf_next_read.tv_nsec)
+ else if (rf0->rf_next_read > rf1->rf_next_read)
return (1);
else
return (0);
int status;
llentry_t *le;
- cdtime_t now = cdtime ();
- CDTIME_T_TO_TIMESPEC (now, &rf->rf_next_read);
+ rf->rf_next_read = cdtime ();
+ rf->rf_effective_interval = rf->rf_interval;
pthread_mutex_lock (&read_lock);
return (0);
} /* int plugin_insert_read */
-static int read_cb_wrapper (user_data_t *ud)
-{
- int (*callback) (void);
-
- if (ud == NULL)
- return -1;
-
- callback = ud->data;
- return callback();
-} /* int read_cb_wrapper */
-
int plugin_register_read (const char *name,
int (*callback) (void))
{
read_func_t *rf;
- plugin_ctx_t ctx = plugin_get_ctx ();
int status;
- if (ctx.interval != 0) {
- /* If ctx.interval is not zero (== use the plugin or global
- * interval), we need to use the "complex" read callback,
- * because only that allows to specify a different interval.
- * Wrap the callback using read_cb_wrapper(). */
- struct timespec interval;
- user_data_t user_data;
-
- user_data.data = callback;
- user_data.free_func = NULL;
-
- CDTIME_T_TO_TIMESPEC (ctx.interval, &interval);
- return plugin_register_complex_read (/* group = */ NULL,
- name, read_cb_wrapper, &interval, &user_data);
- }
-
- DEBUG ("plugin_register_read: default_interval = %.3f",
- CDTIME_T_TO_DOUBLE(plugin_get_interval ()));
-
rf = malloc (sizeof (*rf));
if (rf == NULL)
{
rf->rf_callback = (void *) callback;
rf->rf_udata.data = NULL;
rf->rf_udata.free_func = NULL;
- rf->rf_ctx = ctx;
+ rf->rf_ctx = plugin_get_ctx ();
rf->rf_group[0] = '\0';
sstrncpy (rf->rf_name, name, sizeof (rf->rf_name));
rf->rf_type = RF_SIMPLE;
- rf->rf_interval.tv_sec = 0;
- rf->rf_interval.tv_nsec = 0;
- rf->rf_effective_interval = rf->rf_interval;
+ rf->rf_interval = plugin_get_interval ();
status = plugin_insert_read (rf);
if (status != 0)
user_data_t *user_data)
{
read_func_t *rf;
- plugin_ctx_t ctx = plugin_get_ctx ();
int status;
rf = malloc (sizeof (*rf));
sstrncpy (rf->rf_name, name, sizeof (rf->rf_name));
rf->rf_type = RF_COMPLEX;
if (interval != NULL)
- {
- rf->rf_interval = *interval;
- }
- else if (ctx.interval != 0)
- {
- CDTIME_T_TO_TIMESPEC (ctx.interval, &rf->rf_interval);
- }
- rf->rf_effective_interval = rf->rf_interval;
-
- DEBUG ("plugin_register_read: interval = %i.%09i",
- (int) rf->rf_interval.tv_sec,
- (int) rf->rf_interval.tv_nsec);
+ rf->rf_interval = TIMESPEC_TO_CDTIME_T (interval);
+ else
+ rf->rf_interval = plugin_get_interval ();
/* Set user data */
if (user_data == NULL)
rf->rf_udata = *user_data;
}
- rf->rf_ctx = ctx;
+ rf->rf_ctx = plugin_get_ctx ();
status = plugin_insert_read (rf);
if (status != 0)
(void *) callback, /* user_data = */ NULL));
} /* int plugin_register_shutdown */
+ static void plugin_free_data_sets (void)
+ {
+ void *key;
+ void *value;
+
+ if (data_sets == NULL)
+ return;
+
+ while (c_avl_pick (data_sets, &key, &value) == 0)
+ {
+ data_set_t *ds = value;
+ /* key is a pointer to ds->type */
+
+ sfree (ds->ds);
+ sfree (ds);
+ }
+
+ c_avl_destroy (data_sets);
+ data_sets = NULL;
+ } /* void plugin_free_data_sets */
+
int plugin_register_data_set (const data_set_t *ds)
{
data_set_t *ds_copy;
chain_name = global_option_get ("PostCacheChain");
post_cache_chain = fc_chain_get_by_name (chain_name);
+ {
+ char const *tmp = global_option_get ("WriteThreads");
+ int num = atoi (tmp);
+
+ if (num < 1)
+ num = 5;
+
+ start_write_threads ((size_t) num);
+ }
if ((list_init == NULL) && (read_heap == NULL))
return;
plugin_set_ctx (old_ctx);
}
+ stop_write_threads ();
+
/* Write plugins which use the `user_data' pointer usually need the
* same data available to the flush callback. If this is the case, set
* the free_function to NULL when registering the flush callback and to
destroy_all_callbacks (&list_notification);
destroy_all_callbacks (&list_shutdown);
destroy_all_callbacks (&list_log);
+
+ plugin_free_data_sets ();
} /* void plugin_shutdown_all */
int plugin_dispatch_missing (const value_list_t *vl) /* {{{ */
return (0);
} /* int }}} plugin_dispatch_missing */
-int plugin_dispatch_values (value_list_t *vl)
+static int plugin_dispatch_values_internal (value_list_t *vl)
{
int status;
static c_complain_t no_write_complaint = C_COMPLAIN_INIT_STATIC;
return (-1);
}
- if (vl->time == 0)
- vl->time = cdtime ();
-
- if (vl->interval <= 0)
- {
- plugin_ctx_t ctx = plugin_get_ctx ();
-
- if (ctx.interval != 0)
- vl->interval = ctx.interval;
- else
- {
- char name[6 * DATA_MAX_NAME_LEN];
- FORMAT_VL (name, sizeof (name), vl);
- ERROR ("plugin_dispatch_values: Unable to determine "
- "interval from context for "
- "value list \"%s\". "
- "This indicates a broken plugin. "
- "Please report this problem to the "
- "collectd mailing list or at "
- "<http://collectd.org/bugs/>.", name);
- vl->interval = cf_get_default_interval ();
- }
- }
+ /* Assured by plugin_value_list_clone(). The time is determined at
+ * _enqueue_ time. */
+ assert (vl->time != 0);
+ assert (vl->interval != 0);
DEBUG ("plugin_dispatch_values: time = %.3f; interval = %.3f; "
"host = %s; "
}
return (0);
-} /* int plugin_dispatch_values */
+} /* int plugin_dispatch_values_internal */
-int plugin_dispatch_values_secure (const value_list_t *vl)
+int plugin_dispatch_values (value_list_t const *vl)
{
- value_list_t vl_copy;
- int status;
-
- if (vl == NULL)
- return EINVAL;
-
- memcpy (&vl_copy, vl, sizeof (vl_copy));
-
- /* Write callbacks must not change the values and meta pointers, so we can
- * savely skip copying those and make this more efficient. */
- if ((pre_cache_chain == NULL) && (post_cache_chain == NULL))
- return (plugin_dispatch_values (&vl_copy));
-
- /* Set pointers to NULL, just to be on the save side. */
- vl_copy.values = NULL;
- vl_copy.meta = NULL;
-
- vl_copy.values = malloc (sizeof (*vl_copy.values) * vl->values_len);
- if (vl_copy.values == NULL)
- {
- ERROR ("plugin_dispatch_values_secure: malloc failed.");
- return (ENOMEM);
- }
- memcpy (vl_copy.values, vl->values, sizeof (*vl_copy.values) * vl->values_len);
-
- if (vl->meta != NULL)
- {
- vl_copy.meta = meta_data_clone (vl->meta);
- if (vl_copy.meta == NULL)
- {
- ERROR ("plugin_dispatch_values_secure: meta_data_clone failed.");
- free (vl_copy.values);
- return (ENOMEM);
- }
- } /* if (vl->meta) */
-
- status = plugin_dispatch_values (&vl_copy);
+ int status;
- meta_data_destroy (vl_copy.meta);
- free (vl_copy.values);
+ status = plugin_write_enqueue (vl);
+ if (status != 0)
+ {
+ char errbuf[1024];
+ ERROR ("plugin_dispatch_values: plugin_write_enqueue failed "
+ "with status %i (%s).", status,
+ sstrerror (status, errbuf, sizeof (errbuf)));
+ return (status);
+ }
- return (status);
-} /* int plugin_dispatch_values_secure */
+ return (0);
+}
int plugin_dispatch_notification (const notification_t *notif)
{
{
data_set_t *ds;
+ if (data_sets == NULL)
+ {
+ ERROR ("plugin_get_ds: No data sets are defined yet.");
+ return (NULL);
+ }
+
if (c_avl_get (data_sets, name, (void *) &ds) != 0)
{
DEBUG ("No such dataset registered: %s", name);
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