{"record":{"id":"1d9183bed4f2b0f5","repo":"apache/hadoop","slug":"read-ahead-block-size-must-be-positive","errorCode":null,"errorMessage":"Read-ahead block size must be positive","messagePattern":"Read-ahead block size must be positive","errorType":"validation","errorClass":"IllegalArgumentException","httpStatus":null,"severity":"error","filePath":"hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/services/ReadBufferManager.java","lineNumber":221,"sourceCode":"  /**\n   * Gets the block size used for read-ahead operations.\n   *\n   * @return the read-ahead block size in bytes\n   */\n  @VisibleForTesting\n  protected static int getReadAheadBlockSize() {\n    return blockSize;\n  }\n\n  /**\n   * Sets the block size used for read-ahead operations.\n   *\n   * @param readAheadBlockSize the read-ahead block size in bytes\n   */\n  @VisibleForTesting\n  protected static void setReadAheadBlockSize(int readAheadBlockSize) {\n    if (readAheadBlockSize <= 0) {\n      throw new IllegalArgumentException(\"Read-ahead block size must be positive\");\n    }\n    blockSize = readAheadBlockSize;\n  }\n\n  /**\n   * Gets the queue of read-ahead requests.\n   *\n   * @return the queue of {@link ReadBuffer} objects in the read-ahead queue\n   */\n  Queue<ReadBuffer> getReadAheadQueue() {\n    return readAheadQueue;\n  }\n\n  /**\n   * Gets the list of in-progress read buffers.\n   *\n   * @return the list of {@link ReadBuffer} objects that are currently being processed\n   */","sourceCodeStart":203,"sourceCodeEnd":239,"githubUrl":"https://github.com/apache/hadoop/blob/2add9630210752f88ceb1bb74eb65e37bf41da8e/hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/services/ReadBufferManager.java#L203-L239","documentation":"Error \"Read-ahead block size must be positive\" thrown in apache/hadoop.","triggerScenarios":"ReadBufferManager is initialized with a non-positive read-ahead block size.","commonSituations":"See trigger scenarios.","solutions":["Set fs.azure.readahead.block.size (or the relevant read-ahead size key) to a positive value.","Verify units and parsing of the configured block size."],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"2add9630210752f88ceb1bb74eb65e37bf41da8e","analyzedAt":"2026-08-22T19:55:07.957Z","schemaVersion":2},"datasetVersion":"2026-08-23T01:17:44.959Z"}