YARN-9667. Use setbuf with line buffer to reduce fflush complexity in container-executor.

            Contributed by Peter Bacsko

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/container-executor/impl/main.c

@@ -130,10 +130,20 @@ static void display_usage(FILE *stream) {
 static void open_log_files() {
   if (LOGFILE == NULL) {
     LOGFILE = stdout;
+    if (setvbuf(LOGFILE, NULL, _IOLBF, BUFSIZ)) {
+      fprintf(LOGFILE, "Failed to invoke setvbuf() for LOGFILE: %s\n", strerror(errno));
+      fflush(LOGFILE);
+      exit(ERROR_CALLING_SETVBUF);
+    }
   }
 
   if (ERRORFILE == NULL) {
     ERRORFILE = stderr;
+    if (setvbuf(ERRORFILE, NULL, _IOLBF, BUFSIZ)) {
+      fprintf(ERRORFILE, "Failed to invoke setvbuf() for ERRORFILE: %s\n", strerror(errno));
+      fflush(ERRORFILE);
+      exit(ERROR_CALLING_SETVBUF);
+    }
   }
 
   // There may be a process reading from stdout/stderr, and if it
@@ -232,7 +242,6 @@ static void assert_valid_setup(char *argv0) {
 
 static void display_feature_disabled_message(const char* name) {
     fprintf(ERRORFILE, "Feature disabled: %s\n", name);
-    fflush(ERRORFILE);
 }
 
 /* Use to store parsed input parmeters for various operations */
@@ -450,7 +459,6 @@ static int validate_run_as_user_commands(int argc, char **argv, int *operation)
   fprintf(LOGFILE, "main : command provided %d\n", command);
   fprintf(LOGFILE, "main : run as user is %s\n", cmd_input.run_as_user_name);
   fprintf(LOGFILE, "main : requested yarn user is %s\n", cmd_input.yarn_user_name);
-  fflush(LOGFILE);
   char * resources = NULL;// key,value pair describing resources
   char * resources_key = NULL;
   char * resources_value = NULL;
@@ -459,14 +467,12 @@ static int validate_run_as_user_commands(int argc, char **argv, int *operation)
     if (argc < 10) {
       fprintf(ERRORFILE, "Too few arguments (%d vs 10) for initialize container\n",
        argc);
-      fflush(ERRORFILE);
       return INVALID_ARGUMENT_NUMBER;
     }
     cmd_input.app_id = argv[optind++];
     cmd_input.container_id = argv[optind++];
     if (!validate_container_id(cmd_input.container_id)) {
       fprintf(ERRORFILE, "Invalid container id %s\n", cmd_input.container_id);
-      fflush(ERRORFILE);
       return INVALID_CONTAINER_ID;
     }
     cmd_input.cred_file = argv[optind++];
@@ -481,7 +487,6 @@ static int validate_run_as_user_commands(int argc, char **argv, int *operation)
       if (!(argc >= 14 && argc <= 17)) {
         fprintf(ERRORFILE, "Wrong number of arguments (%d vs 14 - 17) for"
           " launch docker container\n", argc);
-        fflush(ERRORFILE);
         return INVALID_ARGUMENT_NUMBER;
       }
 
@@ -525,7 +530,6 @@ static int validate_run_as_user_commands(int argc, char **argv, int *operation)
     if (!(argc >= 14 && argc <= 17)) {
       fprintf(ERRORFILE, "Wrong number of arguments (%d vs 14 - 17)"
         " for launch container\n", argc);
-      fflush(ERRORFILE);
       return INVALID_ARGUMENT_NUMBER;
     }
 
@@ -550,9 +554,8 @@ static int validate_run_as_user_commands(int argc, char **argv, int *operation)
 
     if (get_kv_key(resources, resources_key, strlen(resources)) < 0 ||
         get_kv_value(resources, resources_value, strlen(resources)) < 0) {
-        fprintf(ERRORFILE, "Invalid arguments for cgroups resources: %s",
+        fprintf(ERRORFILE, "Invalid arguments for cgroups resources: %s\n",
                            resources);
-        fflush(ERRORFILE);
         free(resources_key);
         free(resources_value);
         return INVALID_ARGUMENT_NUMBER;
@@ -578,7 +581,6 @@ static int validate_run_as_user_commands(int argc, char **argv, int *operation)
     if (argc != 6) {
       fprintf(ERRORFILE, "Wrong number of arguments (%d vs 6) for " \
           "signal container\n", argc);
-      fflush(ERRORFILE);
       return INVALID_ARGUMENT_NUMBER;
     }
 
@@ -587,14 +589,12 @@ static int validate_run_as_user_commands(int argc, char **argv, int *operation)
     cmd_input.container_pid = strtol(option, &end_ptr, 10);
     if (option == end_ptr || *end_ptr != '\0') {
       fprintf(ERRORFILE, "Illegal argument for container pid %s\n", option);
-      fflush(ERRORFILE);
       return INVALID_ARGUMENT_NUMBER;
     }
     option = argv[optind++];
     cmd_input.signal = strtol(option, &end_ptr, 10);
     if (option == end_ptr || *end_ptr != '\0') {
       fprintf(ERRORFILE, "Illegal argument for signal %s\n", option);
-      fflush(ERRORFILE);
       return INVALID_ARGUMENT_NUMBER;
     }
 
@@ -615,8 +615,7 @@ static int validate_run_as_user_commands(int argc, char **argv, int *operation)
     *operation = RUN_AS_USER_SYNC_YARN_SYSFS;
     return 0;
   default:
-    fprintf(ERRORFILE, "Invalid command %d not supported.",command);
-    fflush(ERRORFILE);
+    fprintf(ERRORFILE, "Invalid command %d not supported.\n",command);
     return INVALID_COMMAND_PROVIDED;
   }
 }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/container-executor/impl/modules/devices/devices-module.c

@@ -61,7 +61,6 @@ static int is_block_device(const char* value) {
   char* block_path = malloc(max_path_size);
   if (block_path == NULL) {
     fprintf(ERRORFILE, "Failed to allocate memory for sys device path string.\n");
-    fflush(ERRORFILE);
     goto cleanup;
   }
   if (snprintf(block_path, max_path_size, "/sys/dev/block/%s",

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/container-executor/impl/util.c

@@ -141,8 +141,7 @@ int execute_regex_match(const char *regex_str, const char *input) {
   regex_t regex;
   int regex_match;
   if (0 != regcomp(&regex, regex_str, REG_EXTENDED|REG_NOSUB)) {
-    fprintf(LOGFILE, "Unable to compile regex.");
-    fflush(LOGFILE);
+    fprintf(LOGFILE, "Unable to compile regex.\n");
     exit(ERROR_COMPILING_REGEX);
   }
   regex_match = regexec(&regex, input, (size_t) 0, NULL, 0);

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/container-executor/impl/util.h

@@ -71,7 +71,8 @@ enum errorcodes {
   INVALID_CONTAINER_ID = 43,
   DOCKER_EXEC_FAILED = 44,
   COULD_NOT_CREATE_KEYSTORE_COPY = 45,
-  COULD_NOT_CREATE_TRUSTSTORE_COPY = 46
+  COULD_NOT_CREATE_TRUSTSTORE_COPY = 46,
+  ERROR_CALLING_SETVBUF = 47
 };
 
 /* Macros for min/max. */

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/container-executor/impl/utils/docker-util.c

@@ -318,7 +318,6 @@ static int validate_container_name(const char *container_name) {
     }
   }
   fprintf(ERRORFILE, "Specified container_id=%s is invalid\n", container_name);
-  fflush(ERRORFILE);
   return INVALID_DOCKER_CONTAINER_NAME;
 }
 

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/container-executor/test/test-container-executor.c

@@ -1539,6 +1539,18 @@ int main(int argc, char **argv) {
   LOGFILE = stdout;
   ERRORFILE = stderr;
 
+  if (setvbuf(LOGFILE, NULL, _IOLBF, BUFSIZ)) {
+    fprintf(LOGFILE, "Failed to invoke setvbuf() for LOGFILE: %s\n", strerror(errno));
+    fflush(LOGFILE);
+    exit(ERROR_CALLING_SETVBUF);
+  }
+
+  if (setvbuf(ERRORFILE, NULL, _IOLBF, BUFSIZ)) {
+    fprintf(ERRORFILE, "Failed to invoke setvbuf() for ERRORFILE: %s\n", strerror(errno));
+    fflush(ERRORFILE);
+    exit(ERROR_CALLING_SETVBUF);
+  }
+
   nm_uid = getuid();
 
   printf("Attempting to clean up from any previous runs\n");