{"record":{"id":"11a8fa814e2a4dfe","repo":"apache/beam","slug":"unable-to-fetch-file-s-to-be-used-locally-to-create-a-kafka","errorCode":null,"errorMessage":"Unable to fetch file %s to be used locally to create a Kafka Consumer.","messagePattern":"Unable to fetch file (.+?) to be used locally to create a Kafka Consumer\\.","errorType":"validation","errorClass":"IllegalArgumentException","httpStatus":null,"severity":"error","filePath":"sdks/java/io/kafka/src/main/java/org/apache/beam/sdk/io/kafka/KafkaReadSchemaTransformProvider.java","lineNumber":418,"sourceCode":"          try {\n            Path localFile = Files.createTempFile(\"\", \"\");\n            LOG.info(\n                \"Downloading {} into local filesystem ({})\", configStr, localFile.toAbsolutePath());\n            // TODO(pabloem): Only copy if file does not exist.\n            try (ReadableByteChannel channel =\n                    FileSystems.open(FileSystems.match(configStr).metadata().get(0).resourceId());\n                FileOutputStream outputStream = new FileOutputStream(localFile.toFile());\n                WritableByteChannel outputChannel = Channels.newChannel(outputStream)) {\n              ByteBuffer buffer = ByteBuffer.allocate(1024);\n              while (channel.read(buffer) != -1) {\n                buffer.flip();\n                outputChannel.write(buffer);\n                buffer.compact();\n              }\n            }\n            return localFile.toAbsolutePath().toString();\n          } catch (IOException e) {\n            throw new IllegalArgumentException(\n                String.format(\n                    \"Unable to fetch file %s to be used locally to create a Kafka Consumer.\",\n                    configStr),\n                e);\n          }\n        } else {\n          return configValue;\n        }\n      } else {\n        return configValue;\n      }\n    }\n  }\n}\n","sourceCodeStart":400,"sourceCodeEnd":433,"githubUrl":"https://github.com/apache/beam/blob/12126d8942aaf848030c478b4c6a28c6af861c66/sdks/java/io/kafka/src/main/java/org/apache/beam/sdk/io/kafka/KafkaReadSchemaTransformProvider.java#L400-L433","documentation":"identityOrGcsToLocalFile downloads a remote config file (e.g. a GCS-hosted Kafka config) to a local temp file so a Kafka Consumer can use it. If reading/writing the file fails with IOException, it is wrapped in an IllegalArgumentException saying the file could not be fetched locally.","triggerScenarios":"apply() is given a configStr pointing to a remote file (GCS) that cannot be read or written locally — GCS object missing, credentials missing, network failure, or local temp-dir write failure.","commonSituations":"Passing a gs:// path with a typo or missing object, running without GCS access credentials, or an environment with a read-only temp directory.","solutions":["Verify the file exists and the gs:// path is correct (gsutil ls the object)","Check that the runtime has GCS credentials/permissions (service account with storage.objects.get)","Test local filesystem writability (temp dir space/permissions)","If the config is static, ship it as a local path on workers instead of a remote URI"],"exampleFix":"// before\nthrow new IllegalArgumentException(String.format(\"Unable to fetch file %s ...\", configStr), e);\n// after (caller-side): validate the file is fetchable first\nif (!GcsUtil.isReadable(configStr)) {\n  throw new IllegalArgumentException(\"Config file not accessible before building consumer: \" + configStr);\n}","handlingStrategy":"validation","validationCode":"// verify the remote file is fetchable before building the consumer\njava.nio.file.Path local = java.nio.file.Files.createTempFile(\"kafka\", \".cfg\");\n// attempt copy first; only pass configStr if it succeeds","typeGuard":null,"tryCatchPattern":"try {\n  String localPath = identityOrGcsToLocalFile(configStr);\n} catch (IllegalArgumentException e) {\n  LOG.error(\"Kafka config file fetch failed: {}\", e.getCause());\n}","preventionTips":["Verify gs:// paths exist before submitting the pipeline","Grant worker service accounts read access to the config bucket","Prefer distributing config via local worker files when network access is restricted"],"tags":["java","gcs","io","configuration"],"backgroundTag":"file-not-found","analyzedSha":"12126d8942aaf848030c478b4c6a28c6af861c66","analyzedAt":"2026-09-13T01:50:10.254Z","contentChangedAt":"2026-09-13T01:50:10.254Z","schemaVersion":2},"datasetVersion":"2026-09-14T16:17:12.679Z"}