Change event logs to store one Redis ZSET per worker. (#705)

* Changing to zset

* Fixed bug.

* Fixed another bug.

* Modified task_profiles.

* Removed extra file.

* Modified task_profiles test.

* WIP

* WIP

* Undid changes

* Updated

* WIP

* Made changes according to comments.

* Removed unneeded print.

* Removed ujson usage.

* failing test

* tests passing

* Fixed linting errors and modified style.

* Fixed bug.

* Fixed linting

* Fixed according to comments.

* Redis crashing?

* Fixed linting

* Fixed linting

src/common/logging.cc

@@ -9,6 +9,8 @@
 
 #include "state/redis.h"
 #include "io.h"
+#include <iostream>
+#include <string>
 
 static const char *log_levels[5] = {"DEBUG", "INFO", "WARN", "ERROR", "FATAL"};
 static const char *log_fmt =
@@ -90,9 +92,12 @@ void RayLogger_log_event(DBHandle *db,
                          uint8_t *key,
                          int64_t key_length,
                          uint8_t *value,
-                         int64_t value_length) {
-  int status = redisAsyncCommand(db->context, NULL, NULL, "RPUSH %b %b", key,
-                                 key_length, value, value_length);
+                         int64_t value_length,
+                         double timestamp) {
+  std::string timestamp_string = std::to_string(timestamp);
+  int status = redisAsyncCommand(db->context, NULL, NULL, "ZADD %b %s %b", key,
+                                 key_length, timestamp_string.c_str(), value,
+                                 value_length);
   if ((status == REDIS_ERR) || db->context->err) {
     LOG_REDIS_DEBUG(db->context, "error while logging message to event log");
   }

src/common/logging.h

@@ -52,6 +52,7 @@ void RayLogger_log_event(DBHandle *db,
                          uint8_t *key,
                          int64_t key_length,
                          uint8_t *value,
-                         int64_t value_length);
+                         int64_t value_length,
+                         double time);
 
 #endif /* LOGGING_H */