{"record":{"id":"0a9d05c17401d9f7","repo":"alibaba/canal","slug":"end-of-stream-when-reading-header-0a9d05","errorCode":null,"errorMessage":"end of stream when reading header","messagePattern":"end of stream when reading header","errorType":"exception","errorClass":"IOException","httpStatus":null,"severity":"error","filePath":"client/src/main/java/com/alibaba/otter/canal/client/impl/SimpleCanalConnector.java","lineNumber":425,"sourceCode":"        }\n    }\n\n    private byte[] readNextPacket(ReadableByteChannel channel) throws IOException {\n        synchronized (readDataLock) {\n            readHeader.clear();\n            read(channel, readHeader);\n            int bodyLen = readHeader.getInt(0);\n            ByteBuffer bodyBuf = ByteBuffer.allocate(bodyLen).order(ByteOrder.BIG_ENDIAN);\n            read(channel, bodyBuf);\n            return bodyBuf.array();\n        }\n    }\n\n    private void read(ReadableByteChannel channel, ByteBuffer buffer) throws IOException {\n        while (buffer.hasRemaining()) {\n            int r = channel.read(buffer);\n            if (r == -1) {\n                throw new IOException(\"end of stream when reading header\");\n            }\n        }\n    }\n\n    private synchronized void initClientRunningMonitor(ClientIdentity clientIdentity) {\n        if (zkClientx != null && clientIdentity != null && runningMonitor == null) {\n            ClientRunningData clientData = new ClientRunningData();\n            clientData.setClientId(clientIdentity.getClientId());\n            clientData.setAddress(AddressUtils.getHostIp());\n\n            runningMonitor = new ClientRunningMonitor();\n            runningMonitor.setDestination(clientIdentity.getDestination());\n            runningMonitor.setZkClient(zkClientx);\n            runningMonitor.setClientData(clientData);\n            runningMonitor.setListener(new ClientRunningListener() {\n\n                public InetSocketAddress processActiveEnter() {\n                    InetSocketAddress address = doConnect();","sourceCodeStart":407,"sourceCodeEnd":443,"githubUrl":"https://github.com/alibaba/canal/blob/87be50e87686a3e8af08c368d0e1ffd1f59eb04a/client/src/main/java/com/alibaba/otter/canal/client/impl/SimpleCanalConnector.java#L407-L443","documentation":"Error \"end of stream when reading header\" thrown in alibaba/canal.","triggerScenarios":"Thrown at client/src/main/java/com/alibaba/otter/canal/client/impl/SimpleCanalConnector.java:425 when the library encounters an invalid state.","commonSituations":"Stream ended mid-header. Reconnect with a fresh channel rather than resuming reads, and check server health and network intermediaries for dropped connections.","solutions":["Check network stability between client and server; the connection was closed mid-read.","Increase socketTimeout on the connector if the server is slow to respond under load.","Reconnect the connector and resume consumption from the last acked position."],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"87be50e87686a3e8af08c368d0e1ffd1f59eb04a","analyzedAt":"2026-08-14T04:30:11.918Z","schemaVersion":2},"datasetVersion":"2026-08-14T05:17:29.042Z"}