Fix for missing physical plan in UI

bazel_configure.py

@@ -103,10 +103,10 @@ def discover_git_branch():
 # Utility functions for system defines
 ######################################################################
 def define_string(name, value):
-  return '#define %s "%s"\n' % (name, value)
+  return f'#define {name} "{value}"\n'
 
 def define_value(name, value):
-  return '#define %s %s\n' % (name, value)
+  return f'#define {name} {value}\n'
 
 ######################################################################
 # Discover where a program is located using the PATH variable
@@ -144,7 +144,7 @@ def real_program_path(program_name):
   return None
 
 def fail(message):
-  print("\nFAILED:  %s" % message)
+  print(f"\nFAILED:  {message}")
   sys.exit(1)
 
 # Assumes the version is at the end of the first line consisting of digits and dots
@@ -158,7 +158,7 @@ def discover_version(path):
     version_flag = "-V"
   else:
     version_flag = "--version"
-  command = "%s %s" % (path, version_flag)
+  command = f"{path} {version_flag}"
   version_output = subprocess.check_output(command, stderr=subprocess.STDOUT, shell=True)
   first_line = version_output.decode('ascii', 'ignore').split("\n")[0]
   version = get_trailing_version(first_line)
@@ -215,12 +215,12 @@ def discover_version(path):
       return version
 
 
-  fail ("Could not determine the version of %s from the following output\n%s\n%s" % (path, command, version_output))
+  fail (f"Could not determine the version of {path} from the following output\n{command}\n{version_output}")
 
 def to_semver(version):
   # is version too short
   if re.search('^[\d]+\.[\d]+$', version):
-    return "%s.0" % version
+    return f"{version}.0"
 
   # is version too long
   version_search = re.search('^([\d]+\.[\d]+\.[\d]+)\.[\d]+$', version)
@@ -231,8 +231,8 @@ def to_semver(version):
 
 def assert_min_version(path, min_version):
   version = discover_version(path)
-  if not semver.match(to_semver(version), ">=%s" % to_semver(min_version)):
-    fail("%s is version %s which is less than the required version %s" % (path, version, min_version))
+  if not semver.match(to_semver(version), f">={to_semver(min_version)}"):
+    fail(f"{path} is version {version} which is less than the required version {min_version}")
   return version
 
 ######################################################################
@@ -267,17 +267,17 @@ def make_executable(path):
 def discover_tool(program, msg, envvar, min_version = ''):
   VALUE = discover_program(program, envvar)
   if not VALUE:
-    fail("""You need to have %s installed to build Heron.
-Note: Some vendors install %s with a versioned name
-(like /usr/bin/%s-4.8). You can set the %s environment
-variable to specify the full path to yours.'""" % (program, program, program, envvar))
+    fail(f"""You need to have {program} installed to build Heron.
+Note: Some vendors install {program} with a versioned name
+(like /usr/bin/{program}-4.8). You can set the {envvar} environment
+variable to specify the full path to yours.'""")
 
   print_value = VALUE
   if min_version:
     version = assert_min_version(VALUE, min_version)
-    print_value = "%s (%s)" % (VALUE, version)
+    print_value = f"{VALUE} ({version})"
 
-  print('Using %s:\t%s' % (msg.ljust(20), print_value))
+  print(f'Using {msg.ljust(20)}:\t{print_value}')
   return VALUE
 
 def discover_jdk():
@@ -290,7 +290,7 @@ def discover_jdk():
              "You can set the JAVA_HOME environment variavle to specify the full path to yours.")
     jdk_bin_path = os.path.dirname(javac_path)
     jdk_path = os.path.dirname(jdk_bin_path)
-  print('Using %s:\t%s' % ('JDK'.ljust(20), jdk_path))
+  print(f"Using {'JDK'.ljust(20)}:\t{jdk_path}")
   return jdk_path
 
 def test_venv():
@@ -312,14 +312,14 @@ def discover_tool_default(program, msg, envvar, defvalue):
   VALUE = discover_program(program, envvar)
   if not VALUE:
     VALUE = defvalue
-    print('%s:\tnot found, but ok' % (program.ljust(26)))
+    print(f'{program.ljust(26)}:\tnot found, but ok')
   else:
-    print('Using %s:\t%s' % (msg.ljust(20), VALUE))
+    print(f'Using {msg.ljust(20)}:\t{VALUE}')
   return VALUE
 
 def export_env_to_file(out_file, env):
   if env in os.environ:
-    out_file.write('export %s="%s"\n' % (env, os.environ[env]))
+    out_file.write(f'export {env}="{os.environ[env]}"\n')
 
 ######################################################################
 # Generate the shell script that recreates the environment
@@ -348,7 +348,7 @@ def write_env_exec_file(platform, environ):
   out_file.write('$*')
 
   make_executable(env_exec_file)
-  print('Wrote the environment exec file %s' % (env_exec_file))
+  print(f'Wrote the environment exec file {env_exec_file}')
 
 
 ######################################################################
@@ -385,13 +385,13 @@ def write_heron_config_header(config_file):
   out_file.write(define_string('GIT_BRANCH', discover_git_branch()))
   out_file.write(generate_system_defines())
   out_file.close()
-  print('Wrote the heron config header file: \t"%s"' % (config_file))
+  print(f'Wrote the heron config header file: \t"{config_file}"')
 
 ######################################################################
 # MAIN program that sets up your workspace for bazel
 ######################################################################
 def main():
-  env_map = dict()
+  env_map = {}
 
   # Discover the platform
   platform = discover_platform()

examples/src/java/org/apache/heron/examples/api/AckingTopology.java

@@ -20,6 +20,7 @@
 
 package org.apache.heron.examples.api;
 
+import java.time.Duration;
 import java.util.Map;
 import java.util.Random;
 
@@ -36,6 +37,7 @@
 import org.apache.heron.api.tuple.Fields;
 import org.apache.heron.api.tuple.Tuple;
 import org.apache.heron.api.tuple.Values;
+import org.apache.heron.common.basics.SysUtils;
 
 /**
  * This is a basic example of a Heron topology with acking enable.
@@ -53,7 +55,7 @@ public static void main(String[] args) throws Exception {
 
     int spouts = 2;
     int bolts = 2;
-    builder.setSpout("word", new AckingTestWordSpout(), spouts);
+    builder.setSpout("word", new AckingTestWordSpout(Duration.ofMillis(200)), spouts);
     builder.setBolt("exclaim1", new ExclamationBolt(), bolts)
         .shuffleGrouping("word");
 
@@ -97,8 +99,10 @@ public static class AckingTestWordSpout extends BaseRichSpout {
     private SpoutOutputCollector collector;
     private String[] words;
     private Random rand;
+    private final Duration throttleDuration;
 
-    public AckingTestWordSpout() {
+    public AckingTestWordSpout(Duration throttleDuration) {
+      this.throttleDuration = throttleDuration;
     }
 
     @SuppressWarnings("rawtypes")
@@ -116,7 +120,9 @@ public void close() {
 
     public void nextTuple() {
       final String word = words[rand.nextInt(words.length)];
-
+      if (!throttleDuration.isZero()) {
+        SysUtils.sleep(throttleDuration); // sleep to throttle back CPU usage
+      }
       // To enable acking, we need to emit each tuple with a MessageId, which is an Object.
       // Each new message emitted needs to be annotated with a unique ID, which allows
       // the spout to keep track of which messages should be acked back to the producer or

examples/src/python/bolt/consume_bolt.py

@@ -33,4 +33,4 @@ def process(self, tup):
 
   def process_tick(self, tup):
     self.log("Got tick tuple!")
-    self.log("Total received data tuple: %d" % self.total)
+    self.log(f"Total received data tuple: {self.total}")

examples/src/python/bolt/count_bolt.py

@@ -20,7 +20,7 @@
 
 """module for example bolt: CountBolt"""
 from collections import Counter
-import heronpy.api.global_metrics as global_metrics
+from heronpy.api import global_metrics
 from heronpy.api.bolt.bolt import Bolt
 
 # pylint: disable=unused-argument
@@ -34,8 +34,8 @@ def initialize(self, config, context):
     self.counter = Counter()
     self.total = 0
 
-    self.logger.info("Component-specific config: \n%s" % str(config))
-    self.logger.info("Context: \n%s" % str(context))
+    self.logger.info(f"Component-specific config: \n{str(config)}")
+    self.logger.info(f"Context: \n{str(context)}")
 
   def _increment(self, word, inc_by):
     self.counter[word] += inc_by
@@ -49,4 +49,4 @@ def process(self, tup):
 
   def process_tick(self, tup):
     self.log("Got tick tuple!")
-    self.log("Current map: %s" % str(self.counter))
+    self.log(f"Current map: {str(self.counter)}")

examples/src/python/bolt/half_ack_bolt.py

@@ -30,12 +30,12 @@ def initialize(self, config, context):
   def process(self, tup):
     self.total += 1
     if self.total % 2 == 0:
-      self.logger.debug("Failing a tuple: %s" % str(tup))
+      self.logger.debug("Failing a tuple: %s", str(tup))
       self.fail(tup)
     else:
-      self.logger.debug("Acking a tuple: %s" % str(tup))
+      self.logger.debug("Acking a tuple: %s", str(tup))
       self.ack(tup)
 
   def process_tick(self, tup):
     self.log("Got tick tuple!")
-    self.log("Total received: %d" % self.total)
+    self.log(f"Total received: {self.total}")

examples/src/python/bolt/stateful_count_bolt.py

@@ -21,7 +21,7 @@
 """module for example bolt: CountBolt"""
 from collections import Counter
 
-import heronpy.api.global_metrics as global_metrics
+from heronpy.api import global_metrics
 from heronpy.api.bolt.bolt import Bolt
 from heronpy.api.state.stateful_component import StatefulComponent
 
@@ -34,19 +34,19 @@ class StatefulCountBolt(Bolt, StatefulComponent):
   # pylint: disable=attribute-defined-outside-init
   def init_state(self, stateful_state):
     self.recovered_state = stateful_state
-    self.logger.info("Checkpoint Snapshot recovered : %s" % str(self.recovered_state))
+    self.logger.info(f"Checkpoint Snapshot recovered : {str(self.recovered_state)}")
 
   def pre_save(self, checkpoint_id):
     for (k, v) in list(self.counter.items()):
       self.recovered_state.put(k, v)
-    self.logger.info("Checkpoint Snapshot %s : %s" % (checkpoint_id, str(self.recovered_state)))
+    self.logger.info(f"Checkpoint Snapshot {checkpoint_id} : {str(self.recovered_state)}")
 
   def initialize(self, config, context):
     self.logger.info("In prepare() of CountBolt")
     self.counter = Counter()
     self.total = 0
 
-    self.logger.info("Component-specific config: \n%s" % str(config))
+    self.logger.info(f"Component-specific config: \n{str(config)}")
 
   def _increment(self, word, inc_by):
     self.counter[word] += inc_by

examples/src/python/bolt/stream_aggregate_bolt.py

@@ -34,4 +34,4 @@ def process(self, tup):
 
   def process_tick(self, tup):
     self.log("Got tick tuple!")
-    self.log("Current stream counter: %s" % str(self.stream_counter))
+    self.log(f"Current stream counter: {str(self.stream_counter)}")

examples/src/python/bolt/window_size_bolt.py

@@ -27,11 +27,11 @@ class WindowSizeBolt(SlidingWindowBolt):
      A bolt that calculates the average batch size of window"""
 
   def initialize(self, config, context):
-    super(WindowSizeBolt, self).initialize(config, context)
+    super().initialize(config, context)
     self.numerator = 0.0
     self.denominator = 0.0
 
   def processWindow(self, window_info, tuples):
     self.numerator += len(tuples)
     self.denominator += 1
-    self.logger.info("The current average is %f" % (self.numerator / self.denominator))
+    self.logger.info(f"The current average is {(self.numerator / self.denominator)}")

examples/src/python/spout/multi_stream_spout.py

@@ -36,15 +36,15 @@ def initialize(self, config, context):
 
     self.emit_count = 0
 
-    self.logger.info("Component-specific config: \n%s" % str(config))
-    self.logger.info("Context: \n%s" % str(context))
+    self.logger.info(f"Component-specific config: \n{str(config)}")
+    self.logger.info(f"Context: \n{str(context)}")
 
   def next_tuple(self):
     word = next(self.words)
     self.emit([word])
     self.emit_count += 1
 
     if self.emit_count % 100000 == 0:
-      self.logger.info("Emitted %s" % str(self.emit_count))
+      self.logger.info(f"Emitted {str(self.emit_count)}")
       self.logger.info("Emitting to error stream")
       self.emit(["test error message"], stream='error')

examples/src/python/spout/stateful_word_spout.py

@@ -34,13 +34,13 @@ class StatefulWordSpout(Spout, StatefulComponent):
   # pylint: disable=attribute-defined-outside-init
   def init_state(self, stateful_state):
     self.recovered_state = stateful_state
-    self.logger.info("Checkpoint Snapshot recovered : %s" % str(self.recovered_state))
+    self.logger.info(f"Checkpoint Snapshot recovered : {str(self.recovered_state)}")
 
   def pre_save(self, checkpoint_id):
     # Purely for debugging purposes
     for (k, v) in list(self.counter.items()):
       self.recovered_state.put(k, v)
-    self.logger.info("Checkpoint Snapshot %s : %s" % (checkpoint_id, str(self.recovered_state)))
+    self.logger.info(f"Checkpoint Snapshot {checkpoint_id} : {str(self.recovered_state)}")
 
   # pylint: disable=unused-argument
   def initialize(self, config, context):
@@ -52,7 +52,7 @@ def initialize(self, config, context):
     self.ack_count = 0
     self.fail_count = 0
 
-    self.logger.info("Component-specific config: \n%s" % str(config))
+    self.logger.info(f"Component-specific config: \n{str(config)}")
 
   def next_tuple(self):
     word = next(self.words)

examples/src/python/spout/word_spout.py

@@ -37,8 +37,8 @@ def initialize(self, config, context):
     self.ack_count = 0
     self.fail_count = 0
 
-    self.logger.info("Component-specific config: \n%s" % str(config))
-    self.logger.info("Context: \n%s" % str(context))
+    self.logger.info(f"Component-specific config: \n{str(config)}")
+    self.logger.info(f"Context: \n{str(context)}")
 
   def next_tuple(self):
     word = next(self.words)
@@ -50,9 +50,9 @@ def next_tuple(self):
   def ack(self, tup_id):
     self.ack_count += 1
     if self.ack_count % 100000 == 0:
-      self.logger.info("Acked %sth tuples, tup_id: %s" % (str(self.ack_count), str(tup_id)))
+      self.logger.info(f"Acked {str(self.ack_count)}th tuples, tup_id: {str(tup_id)}")
 
   def fail(self, tup_id):
     self.fail_count += 1
     if self.fail_count % 100000 == 0:
-      self.logger.info("Failed %sth tuples, tup_id: %s" % (str(self.fail_count), str(tup_id)))
+      self.logger.info(f"Failed {str(self.fail_count)}th tuples, tup_id: {str(tup_id)}")