[6.1.0]Add a flag to disable execution log sorting.

src/main/java/com/google/devtools/build/lib/bazel/BUILD

@@ -123,6 +123,7 @@ java_library(
         "//src/main/java/com/google/devtools/build/lib/util/io",
         "//src/main/java/com/google/devtools/build/lib/vfs",
         "//src/main/protobuf:failure_details_java_proto",
+        "//src/main/protobuf:spawn_java_proto",
     ],
 )
 

src/main/java/com/google/devtools/build/lib/bazel/SpawnLogModule.java

@@ -19,6 +19,7 @@
 import com.google.devtools.build.lib.exec.ExecutionOptions;
 import com.google.devtools.build.lib.exec.ExecutorBuilder;
 import com.google.devtools.build.lib.exec.ModuleActionContextRegistry;
+import com.google.devtools.build.lib.exec.Protos.SpawnExec;
 import com.google.devtools.build.lib.exec.SpawnLogContext;
 import com.google.devtools.build.lib.remote.options.RemoteOptions;
 import com.google.devtools.build.lib.runtime.BlazeModule;
@@ -162,7 +163,14 @@ public void afterCommand() throws AbruptExitException {
         spawnLogContext.close();
         if (!outputStreams.isEmpty()) {
           InputStream in = rawOutput.getInputStream();
-          StableSort.stableSort(in, outputStreams);
+          if (spawnLogContext.shouldSort()) {
+            StableSort.stableSort(in, outputStreams);
+          } else {
+            while (in.available() > 0) {
+              SpawnExec ex = SpawnExec.parseDelimitedFrom(in);
+              outputStreams.write(ex);
+            }
+          }
           outputStreams.close();
         }
         done = true;

src/main/java/com/google/devtools/build/lib/exec/ExecutionOptions.java

@@ -472,6 +472,17 @@ public boolean usingLocalTestJobs() {
               + " --subcommands (for displaying subcommands in terminal output).")
   public PathFragment executionLogJsonFile;
 
+  @Option(
+      name = "execution_log_sort",
+      defaultValue = "true",
+      documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
+      effectTags = {OptionEffectTag.UNKNOWN},
+      help =
+          "Whether to sort the execution log. Set to false to improve memory"
+              + " performance, at the cost of producing the log in nondeterministic"
+              + " order.")
+  public boolean executionLogSort;
+
   @Option(
       name = "experimental_split_xml_generation",
       defaultValue = "true",

src/main/java/com/google/devtools/build/lib/exec/SpawnLogContext.java

@@ -326,4 +326,8 @@ private Digest computeDigest(
         .setSizeBytes(fileSize)
         .build();
   }
+
+  public boolean shouldSort() {
+    return executionOptions.executionLogSort;
+  }
 }