Make disk persistence capacity configurable

agent/agent-tooling/src/main/java/com/microsoft/applicationinsights/agent/internal/configuration/Configuration.java

@@ -304,6 +304,9 @@ public static class PreviewConfiguration {
     // telemetry (they are much smaller so a larger queue size is ok)
     public int metricsExportQueueCapacity = 65536;
 
+    // disk persistence has a default capacity of 50MB
+    public int diskPersistenceMaxSizeMb = 50;
+
     // unfortunately the Java SDK behavior has always been to report the "% Processor Time" number
     // as "normalized" (divided by # of CPU cores), even though it should be non-normalized
     // we cannot change this existing behavior as it would break existing customers' alerts, but at

agent/agent-tooling/src/main/java/com/microsoft/applicationinsights/agent/internal/init/SecondEntryPoint.java

@@ -150,6 +150,7 @@ public void customize(AutoConfigurationCustomizer autoConfiguration) {
                 config.internal.statsbeat.endpoint)
             .setRoleName(config.role.name)
             .setRoleInstance(config.role.instance)
+            .setDiskPersistenceMaxSizeMb(config.preview.diskPersistenceMaxSizeMb)
             .build();
 
     PerformanceCounterInitializer.initialize(telemetryClient, config);

agent/agent-tooling/src/main/java/com/microsoft/applicationinsights/agent/internal/telemetry/TelemetryClient.java

@@ -90,6 +90,7 @@ public class TelemetryClient {
   @Nullable private final File tempDir;
   private final int generalExportQueueCapacity;
   private final int metricsExportQueueCapacity;
+  private final int diskPersistenceMaxSizeMb;
 
   @Nullable private final Configuration.AadAuthentication aadAuthentication;
 
@@ -125,6 +126,7 @@ public TelemetryClient(Builder builder) {
     this.statsbeatConnectionString = builder.statsbeatConnectionString;
     this.roleName = builder.roleName;
     this.roleInstance = builder.roleInstance;
+    this.diskPersistenceMaxSizeMb = builder.diskPersistenceMaxSizeMb;
   }
 
   public static TelemetryClient getActive() {
@@ -259,6 +261,7 @@ private BatchItemProcessor initBatchItemProcessor(
               new DiagnosticTelemetryPipelineListener(
                   "Sending telemetry to the ingestion service", true),
               new LocalStorageTelemetryPipelineListener(
+                  diskPersistenceMaxSizeMb,
                   TempDirs.getSubDir(tempDir, TELEMETRY_FOLDER_NAME),
                   telemetryPipeline,
                   statsbeatModule.getNonessentialStatsbeat(),
@@ -290,6 +293,7 @@ public BatchItemProcessor getStatsbeatBatchItemProcessor() {
           } else {
             LocalStorageTelemetryPipelineListener localStorageTelemetryPipelineListener =
                 new LocalStorageTelemetryPipelineListener(
+                    diskPersistenceMaxSizeMb,
                     TempDirs.getSubDir(tempDir, STATSBEAT_FOLDER_NAME),
                     telemetryPipeline,
                     LocalStorageStats.noop(),
@@ -442,6 +446,7 @@ public static class Builder {
     @Nullable private StatsbeatConnectionString statsbeatConnectionString;
     @Nullable private String roleName;
     @Nullable private String roleInstance;
+    private int diskPersistenceMaxSizeMb;
 
     public Builder setCustomDimensions(Map<String, String> customDimensions) {
       StringSubstitutor substitutor = new StringSubstitutor(System.getenv());
@@ -520,6 +525,11 @@ public Builder setRoleInstance(@Nullable String roleInstance) {
       return this;
     }
 
+    public Builder setDiskPersistenceMaxSizeMb(int diskPersistenceMaxSizeMb) {
+      this.diskPersistenceMaxSizeMb = diskPersistenceMaxSizeMb;
+      return this;
+    }
+
     public TelemetryClient build() {
       return new TelemetryClient(this);
     }

agent/azure-monitor-exporter/src/main/java/com/azure/monitor/opentelemetry/exporter/AzureMonitorExporterBuilder.java

@@ -333,6 +333,7 @@ private TelemetryItemExporter initExporterBuilder() {
           new TelemetryItemExporter(
               pipeline,
               new LocalStorageTelemetryPipelineListener(
+                  50, // default to 50MB
                   TempDirs.getSubDir(tempDir, "telemetry"),
                   pipeline,
                   LocalStorageStats.noop(),

agent/azure-monitor-exporter/src/main/java/com/azure/monitor/opentelemetry/exporter/implementation/localstorage/LocalFileSender.java

@@ -38,9 +38,6 @@ class LocalFileSender implements Runnable {
 
   private static final Logger logger = LoggerFactory.getLogger(LocalFileSender.class);
 
-  // send persisted telemetries from local disk every 30 seconds.
-  private static final long INTERVAL_SECONDS = 30;
-
   private final LocalFileLoader localFileLoader;
   private final TelemetryPipeline telemetryPipeline;
 
@@ -51,6 +48,7 @@ class LocalFileSender implements Runnable {
   private final TelemetryPipelineListener diagnosticListener;
 
   LocalFileSender(
+      long intervalSeconds,
       LocalFileLoader localFileLoader,
       TelemetryPipeline telemetryPipeline,
       boolean suppressWarnings) { // used to suppress warnings from statsbeat
@@ -64,7 +62,7 @@ class LocalFileSender implements Runnable {
                 "Sending telemetry to the ingestion service (retry from disk)", false);
 
     scheduledExecutor.scheduleWithFixedDelay(
-        this, INTERVAL_SECONDS, INTERVAL_SECONDS, TimeUnit.SECONDS);
+        this, intervalSeconds, intervalSeconds, TimeUnit.SECONDS);
   }
 
   void shutdown() {

agent/azure-monitor-exporter/src/main/java/com/azure/monitor/opentelemetry/exporter/implementation/localstorage/LocalFileWriter.java

@@ -34,24 +34,25 @@
 /** This class manages writing a list of {@link ByteBuffer} to the file system. */
 final class LocalFileWriter {
 
-  // 50MB per folder for all apps.
-  private static final long MAX_FILE_SIZE_IN_BYTES = 52428800; // 50MB
   private static final String PERMANENT_FILE_EXTENSION = ".trn";
 
+  private final long diskPersistenceMaxSizeBytes;
   private final LocalFileCache localFileCache;
   private final File telemetryFolder;
   private final LocalStorageStats stats;
 
   private final OperationLogger operationLogger;
 
   LocalFileWriter(
+      int diskPersistenceMaxSizeMb,
       LocalFileCache localFileCache,
       File telemetryFolder,
       LocalStorageStats stats,
       boolean suppressWarnings) { // used to suppress warnings from statsbeat
     this.telemetryFolder = telemetryFolder;
     this.localFileCache = localFileCache;
     this.stats = stats;
+    this.diskPersistenceMaxSizeBytes = diskPersistenceMaxSizeMb * 1024L * 1024L;
 
     operationLogger =
         suppressWarnings
@@ -63,7 +64,7 @@ final class LocalFileWriter {
 
   void writeToDisk(String instrumentationKey, List<ByteBuffer> buffers) {
     long size = getTotalSizeOfPersistedFiles(telemetryFolder);
-    if (size >= MAX_FILE_SIZE_IN_BYTES) {
+    if (size >= diskPersistenceMaxSizeBytes) {
       operationLogger.recordFailure(
           "Local persistent storage capacity has been reached. It's currently at ("
               + (size / 1024)

agent/azure-monitor-exporter/src/main/java/com/azure/monitor/opentelemetry/exporter/implementation/localstorage/LocalStorageTelemetryPipelineListener.java

@@ -40,6 +40,7 @@ public class LocalStorageTelemetryPipelineListener implements TelemetryPipelineL
 
   // telemetryFolder must already exist and be writable
   public LocalStorageTelemetryPipelineListener(
+      int diskPersistenceMaxSizeMb,
       File telemetryFolder,
       TelemetryPipeline pipeline,
       LocalStorageStats stats,
@@ -48,9 +49,14 @@ public LocalStorageTelemetryPipelineListener(
     LocalFileCache localFileCache = new LocalFileCache(telemetryFolder);
     LocalFileLoader loader =
         new LocalFileLoader(localFileCache, telemetryFolder, stats, suppressWarnings);
-    localFileWriter = new LocalFileWriter(localFileCache, telemetryFolder, stats, suppressWarnings);
+    localFileWriter =
+        new LocalFileWriter(
+            diskPersistenceMaxSizeMb, localFileCache, telemetryFolder, stats, suppressWarnings);
 
-    localFileSender = new LocalFileSender(loader, pipeline, suppressWarnings);
+    // send persisted telemetries from local disk every 30 seconds by default.
+    // if diskPersistenceMaxSizeMb is greater than 50, it will get changed to 10 seconds.
+    long intervalSeconds = diskPersistenceMaxSizeMb > 50 ? 10 : 30;
+    localFileSender = new LocalFileSender(intervalSeconds, loader, pipeline, suppressWarnings);
     localFilePurger = new LocalFilePurger(telemetryFolder, suppressWarnings);
   }
 

agent/azure-monitor-exporter/src/test/java/com/azure/monitor/opentelemetry/exporter/implementation/localstorage/IntegrationTests.java

@@ -96,7 +96,7 @@ public void setup() throws Exception {
         new TelemetryItemExporter(
             telemetryPipeline,
             new LocalStorageTelemetryPipelineListener(
-                tempFolder, telemetryPipeline, LocalStorageStats.noop(), false));
+                50, tempFolder, telemetryPipeline, LocalStorageStats.noop(), false));
   }
 
   @Test

agent/azure-monitor-exporter/src/test/java/com/azure/monitor/opentelemetry/exporter/implementation/localstorage/LocalFileLoaderTests.java

@@ -185,7 +185,7 @@ public void testLoadFile() throws IOException {
   public void testWriteAndReadRandomText() {
     String text = "hello world";
     LocalFileCache cache = new LocalFileCache(tempFolder);
-    LocalFileWriter writer = new LocalFileWriter(cache, tempFolder, null, false);
+    LocalFileWriter writer = new LocalFileWriter(50, cache, tempFolder, null, false);
     writer.writeToDisk(INSTRUMENTATION_KEY, singletonList(ByteBuffer.wrap(text.getBytes(UTF_8))));
 
     LocalFileLoader loader = new LocalFileLoader(cache, tempFolder, null, false);
@@ -215,7 +215,7 @@ public void testWriteGzipRawByte() throws IOException {
     // write gzipped bytes[] to disk
     byte[] result = byteArrayOutputStream.toByteArray();
     LocalFileCache cache = new LocalFileCache(tempFolder);
-    LocalFileWriter writer = new LocalFileWriter(cache, tempFolder, null, false);
+    LocalFileWriter writer = new LocalFileWriter(50, cache, tempFolder, null, false);
     writer.writeToDisk(INSTRUMENTATION_KEY, singletonList(ByteBuffer.wrap(result)));
 
     // read gzipped byte[] from disk
@@ -242,7 +242,8 @@ public void testDeleteFilePermanentlyOnSuccess() throws Exception {
     HttpClient mockedClient = getMockHttpClientSuccess();
     HttpPipelineBuilder pipelineBuilder = new HttpPipelineBuilder().httpClient(mockedClient);
     LocalFileCache localFileCache = new LocalFileCache(tempFolder);
-    LocalFileWriter localFileWriter = new LocalFileWriter(localFileCache, tempFolder, null, false);
+    LocalFileWriter localFileWriter =
+        new LocalFileWriter(50, localFileCache, tempFolder, null, false);
     LocalFileLoader localFileLoader = new LocalFileLoader(localFileCache, tempFolder, null, false);
 
     TelemetryPipeline telemetryPipeline =
@@ -294,7 +295,8 @@ public void testDeleteFilePermanentlyOnFailure() throws Exception {
     LocalFileCache localFileCache = new LocalFileCache(tempFolder);
 
     LocalFileLoader localFileLoader = new LocalFileLoader(localFileCache, tempFolder, null, false);
-    LocalFileWriter localFileWriter = new LocalFileWriter(localFileCache, tempFolder, null, false);
+    LocalFileWriter localFileWriter =
+        new LocalFileWriter(50, localFileCache, tempFolder, null, false);
 
     TelemetryPipeline telemetryPipeline =
         new TelemetryPipeline(pipelineBuilder.build(), new URL("http://foo.bar"));

agent/azure-monitor-exporter/src/test/java/com/azure/monitor/opentelemetry/exporter/implementation/localstorage/LocalFilePurgerTests.java

@@ -39,7 +39,7 @@ public class LocalFilePurgerTests {
   public void testPurgedExpiredFiles() throws InterruptedException {
     String text = "hello world";
     LocalFileCache cache = new LocalFileCache(tempFolder);
-    LocalFileWriter writer = new LocalFileWriter(cache, tempFolder, null, false);
+    LocalFileWriter writer = new LocalFileWriter(50, cache, tempFolder, null, false);
 
     // run purge task every second to delete files that are 5 seconds old
     LocalFilePurger purger = new LocalFilePurger(tempFolder, 5L, 1L, false);

agent/azure-monitor-exporter/src/test/java/com/azure/monitor/opentelemetry/exporter/implementation/localstorage/LocalFileWriterTests.java

@@ -88,14 +88,14 @@ public void testWriteByteBuffersList() throws IOException {
 
     assertThat(byteBuffers.size()).isEqualTo(10);
 
-    LocalFileWriter writer = new LocalFileWriter(localFileCache, tempFolder, null, false);
+    LocalFileWriter writer = new LocalFileWriter(50, localFileCache, tempFolder, null, false);
     writer.writeToDisk("00000000-0000-0000-0000-0FEEDDADBEEF", byteBuffers);
     assertThat(localFileCache.getPersistedFilesCache().size()).isEqualTo(1);
   }
 
   @Test
   public void testWriteRawByteArray() {
-    LocalFileWriter writer = new LocalFileWriter(localFileCache, tempFolder, null, false);
+    LocalFileWriter writer = new LocalFileWriter(50, localFileCache, tempFolder, null, false);
     writer.writeToDisk("00000000-0000-0000-0000-0FEEDDADBEEF", singletonList(buffer));
     assertThat(localFileCache.getPersistedFilesCache().size()).isEqualTo(1);
   }
@@ -110,7 +110,8 @@ public void testWriteUnderMultipleThreadsEnvironment() throws InterruptedExcepti
       executorService.execute(
           () -> {
             for (int j = 0; j < 10; j++) {
-              LocalFileWriter writer = new LocalFileWriter(localFileCache, tempFolder, null, false);
+              LocalFileWriter writer =
+                  new LocalFileWriter(50, localFileCache, tempFolder, null, false);
               writer.writeToDisk(
                   "00000000-0000-0000-0000-0FEEDDADBEEF",
                   singletonList(ByteBuffer.wrap(telemetry.getBytes(UTF_8))));

agent/azure-monitor-exporter/src/test/java/com/azure/monitor/opentelemetry/exporter/implementation/pipeline/TelemetryItemExporterTest.java

@@ -71,7 +71,7 @@ private TelemetryItemExporter getExporter() throws MalformedURLException {
 
     return new TelemetryItemExporter(
         telemetryPipeline,
-        new LocalStorageTelemetryPipelineListener(tempFolder, telemetryPipeline, null, false));
+        new LocalStorageTelemetryPipelineListener(50, tempFolder, telemetryPipeline, null, false));
   }
 
   private static String getRequestBodyString(Flux<ByteBuffer> requestBody) {