{"record":{"id":"5d5e9b00286044c9","repo":"apache/flink","slug":"there-is-no-enough-data-left-in-the-datainputview","errorCode":null,"errorMessage":"There is no enough data left in the DataInputView.","messagePattern":"There is no enough data left in the DataInputView\\.","errorType":"exception","errorClass":"EOFException","httpStatus":null,"severity":"error","filePath":"flink-core/src/main/java/org/apache/flink/core/memory/AbstractPagedInputView.java","lineNumber":265,"sourceCode":"                    this.positionInSegment += toRead;\n                    break;\n                }\n            }\n            return len;\n        }\n    }\n\n    @Override\n    public void readFully(byte[] b) throws IOException {\n        readFully(b, 0, b.length);\n    }\n\n    @Override\n    public void readFully(byte[] b, int off, int len) throws IOException {\n        int bytesRead = read(b, off, len);\n\n        if (bytesRead < len) {\n            throw new EOFException(\"There is no enough data left in the DataInputView.\");\n        }\n    }\n\n    @Override\n    public boolean readBoolean() throws IOException {\n        return readByte() == 1;\n    }\n\n    @Override\n    public byte readByte() throws IOException {\n        if (this.positionInSegment < this.limitInSegment) {\n            return this.currentSegment.get(this.positionInSegment++);\n        } else {\n            advance();\n            return readByte();\n        }\n    }\n","sourceCodeStart":247,"sourceCodeEnd":283,"githubUrl":"https://github.com/apache/flink/blob/2f3c205e9266cb30240eb7f4fdab15cad629a70f/flink-core/src/main/java/org/apache/flink/core/memory/AbstractPagedInputView.java#L247-L283","documentation":"Thrown as an EOFException by AbstractPagedInputView.readFully(byte[],int,int) when the number of bytes actually read (via read()) is less than the requested length. AbstractPagedInputView reads across a chain of memory segments; if the segments are exhausted before fulfilling the request, the remaining bytes are unavailable and this exception signals truncation.","triggerScenarios":"Reading more bytes than remain in the paged segment stream; deserializing a record whose declared length exceeds the available data; a segment chain that was truncated or under-allocated; reading past the end of a serialized record boundary.","commonSituations":"Corrupted or truncated serialized data in checkpoints; mismatched serialize/deserialize field orders causing over-read; network or storage truncation of paged state data.","solutions":["Verify the serialized data was written by the matching serializer and is not truncated.","Check that the segment chain length matches the expected record size.","Inspect for field-order or type mismatches between writer and reader that cause over-reading.","If reading from a stream, ensure the stream was fully written and not cut off."],"exampleFix":"// before\ninputView.readFully(buffer); // throws if data is short\n\n// after — defensive length check before bulk read\nint available = inputView.available();\nif (available < buffer.length) {\n    throw new IOException(\"Expected \" + buffer.length\n        + \" bytes but only \" + available + \" available\");\n}\ninputView.readFully(buffer);","handlingStrategy":"try-catch","validationCode":null,"typeGuard":null,"tryCatchPattern":"try {\n    inputView.readFully(buffer);\n} catch (EOFException e) {\n    // data is shorter than expected; verify record integrity or regenerate state\n}","preventionTips":["Ensure serialize/deserialize field orders and types match exactly.","Verify checkpoint files are not truncated in storage.","Add record-length cross-checks where possible."],"tags":["memory","paged-io","data-corruption","eof"],"backgroundTag":null,"analyzedSha":"2f3c205e9266cb30240eb7f4fdab15cad629a70f","analyzedAt":"2026-08-14T08:48:24.518Z","schemaVersion":2},"datasetVersion":"2026-08-14T10:17:34.591Z"}