{"record":{"id":"bbe020eada0dc7bb","repo":"apache/hadoop","slug":"remove-not-implemented","errorCode":null,"errorMessage":"Remove Not Implemented","messagePattern":"Remove Not Implemented","errorType":"exception","errorClass":"UnsupportedOperationException","httpStatus":null,"severity":"error","filePath":"hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/MarkableIterator.java","lineNumber":77,"sourceCode":"\n  @Override\n  public void clearMark() throws IOException {\n    baseIterator.clearMark();\n  }\n\n  @Override\n  public boolean hasNext() { \n    return baseIterator.hasNext();\n  }\n\n  @Override\n  public VALUE next() {\n    return baseIterator.next();\n  }\n\n  @Override\n  public void remove() {\n    throw new UnsupportedOperationException(\"Remove Not Implemented\");\n  }\n}\n","sourceCodeStart":59,"sourceCodeEnd":80,"githubUrl":"https://github.com/apache/hadoop/blob/2add9630210752f88ceb1bb74eb65e37bf41da8e/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/MarkableIterator.java#L59-L80","documentation":"Error \"Remove Not Implemented\" thrown in apache/hadoop.","triggerScenarios":"Thrown at hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/MarkableIterator.java:77 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Do not call remove() on MarkableIterator; it is unsupported by design."],"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":"2026-08-22T20:17:22.307Z"}