IMPALA-8209: Include fragment instance ID in memz/ breakdown

The change for IMPALA-7694 had accidentally removed the fragment
instance ID from the memz/ breakdown. This change puts it back and adds
a test to make sure it's there.

This change also pads query IDs with zeros when printing them in the
backend.

Change-Id: I73bf06bf95c88186b16fd03243de9bac946c5cc8
Reviewed-on: http://gerrit.cloudera.org:8080/12524
Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>

be/src/runtime/runtime-state.cc

@@ -73,7 +73,8 @@ RuntimeState::RuntimeState(QueryState* query_state, const TPlanFragmentCtx& frag
     utc_timestamp_(new TimestampValue(
         TimestampValue::Parse(query_state->query_ctx().utc_timestamp_string))),
     local_time_zone_(&TimezoneDatabase::GetUtcTimezone()),
-    profile_(RuntimeProfile::Create(obj_pool(), "<fragment instance>")),
+    profile_(RuntimeProfile::Create(
+        obj_pool(), "Fragment " + PrintId(instance_ctx.fragment_instance_id))),
     instance_buffer_reservation_(new ReservationTracker) {
   Init();
 }

be/src/util/debug-util-test.cc

@@ -34,7 +34,7 @@ TEST(DebugUtil, UniqueID) {
   std::string str("feedbeeff00d7777:2020202020202020");
   EXPECT_EQ(str, PrintId(unique_id));
   unique_id.lo = 0x20ULL;
-  EXPECT_EQ("feedbeeff00d7777:20", PrintId(unique_id));
+  EXPECT_EQ("feedbeeff00d7777:0000000000000020", PrintId(unique_id));
 }
 
 string RecursionStack(int level) {

be/src/util/debug-util.cc

@@ -88,7 +88,8 @@ PRINT_THRIFT_ENUM_IMPL(TUnit)
 
 string PrintId(const TUniqueId& id, const string& separator) {
   stringstream out;
-  out << hex << id.hi << separator << id.lo;
+  // Outputting the separator string resets the stream width.
+  out << hex << setfill('0') << setw(16) << id.hi << separator << setw(16) << id.lo;
   return out.str();
 }
 

tests/webserver/test_web_pages.py

@@ -22,6 +22,7 @@
 from tests.common.impala_test_suite import ImpalaTestSuite
 import json
 import pytest
+import re
 import requests
 
 
@@ -40,6 +41,7 @@ class TestWebPage(ImpalaTestSuite):
   QUERY_FINSTANCES_URL = "http://localhost:{0}/query_finstances"
   RPCZ_URL = "http://localhost:{0}/rpcz"
   THREAD_GROUP_URL = "http://localhost:{0}/thread-group"
+  MEMZ_URL = "http://localhost:{0}/memz"
   METRICS_URL = "http://localhost:{0}/metrics"
   JMX_URL = "http://localhost:{0}/jmx"
   ADMISSION_URL = "http://localhost:{0}/admission"
@@ -111,6 +113,18 @@ def test_memz(self):
     page = requests.get("http://localhost:25020/memz")
     assert page.status_code == requests.codes.ok
 
+  def test_memz_shows_fragment_instance_id(self):
+    """Tests that the memory breakdown on memz shows fragment instance IDs."""
+    query = "select count(*) from functional_parquet.alltypes where bool_col = sleep(100)"
+    query_handle = self.client.execute_async(query)
+    try:
+      self.wait_for_state(query_handle, self.client.QUERY_STATES['RUNNING'], 1000)
+      memz_breakdown = self.get_debug_page(self.MEMZ_URL)['detailed']
+      finstance_re = re.compile("Fragment [0-9a-f]{16}:[0-9a-f]{16}")
+      assert finstance_re.search(memz_breakdown), memz_breakdown
+    finally:
+      self.client.close_query(query_handle)
+
   def test_query_profile_encoded_unknown_query_id(self):
     """Test that /query_profile_encoded error message starts with the expected line in
     case of missing query and does not contain any leading whitespace.