Use one thread for ACLK synchonization (#14281)

* Remove aclk sync threads

* Disable functions if compiled with --disable-cloud

* Allocate and reuse buffer when scanning hosts
Tune transactions when writing metadata
Error checking when executing db_execute (it is already within a loop with retries)

* Schedule host context load in parallel
Child connection will be delayed if context load is not complete
Event loop cleanup

* Delay retention check if context is not loaded
Remove context load check from regular metadata host scan

* Improve checks to check finished threads

* Cleanup warnings when compiling with --disable-cloud

* Clean chart labels that were created before our current maximum retention

* Fix sql statement

* Remove structures members that of no use
Remove buffer allocations when not needed

* Fix compilation error

* Don't check for service running when not from a worker

* Code cleanup if agent is compiled with --disable-cloud
Setup ACLK tables in the database if needed
Submit node status update messages to the cloud

* Fix compilation warning when --disable-cloud is specified

* Address codacy issues

* Remove empty file -- has already been moved under contexts

* Use enum instead of numbers

* Use UUID_STR_LEN

* Add newline at the end of file

* Release node_id to prevent memory leak under certain cases

* Add queries in defines

* Ignore rc from transaction start -- if there is an active transaction, we will use it (same with commit) should further improve in a future PR

* Remove commented out code

* If host is null (it should not be) do not allocate config (coverity reports Resource leak)

* Do garbage collection when contexts is initialized

* Handle the case when config is not yet available for a host

1 files changed, 6 insertions, 0 deletions

diff --git a/streaming/receiver.c b/streaming/receiver.c
index ce2b4869c7..de205de92e 100644
--- a/streaming/receiver.c
+++ b/streaming/receiver.c
@@ -692,6 +692,12 @@ static int rrdpush_receive(struct receiver_state *rpt)
             return 1;
         }
 
+        if (unlikely(rrdhost_flag_check(host, RRDHOST_FLAG_PENDING_CONTEXT_LOAD))) {
+            rrdpush_receive_log_status(rpt, "host is initializing", "INITIALIZATION IN PROGRESS RETRY LATER");
+            close(rpt->fd);
+            return 1;
+        }
+
         // system_info has been consumed by the host structure
         rpt->system_info = NULL;