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internalFilePersistence.create(newFileName, fileMetadata.fileSize());\n-                FileInputStream inputStream = null;\n+    private void migrateV1FilesToV2Location(Migration migration) {\n+        Batch batch = migration.batch();\n+        for (Migration.FileMetadata fileMetadata : migration.getFileMetadata()) {\n+            FileName newFileName = LiteFileName.from(batch, fileMetadata.uri());\n+            internalFilePersistence.create(newFileName, fileMetadata.fileSize());\n+            FileInputStream inputStream = null;\n+            try {\n+                // open the v1 file\n+                inputStream = new FileInputStream(new File(fileMetadata.originalFileLocation()));\n+                byte[] bytes = new byte[RANDOMLY_CHOSEN_BUFFER_SIZE_THAT_SEEMS_TO_WORK];\n+\n+                // read the v1 file\n+                int readLast = 0;\n+                while (readLast != -1) {\n+                    readLast = inputStream.read(bytes);\n+                    if (readLast != 0 && readLast != -1) {\n+                        // write the v1 file to the v2 location\n+                        internalFilePersistence.write(bytes, 0, readLast);\n+                        bytes = new byte[RANDOMLY_CHOSEN_BUFFER_SIZE_THAT_SEEMS_TO_WORK];\n+                    }\n+                }\n+            } catch (IOException e) {\n+                Log.e(getClass().getSimpleName(), e.getMessage());\n+                e.printStackTrace();\n+            } finally {\n                 try {\n-                    // open the v1 file\n-                    inputStream = new FileInputStream(new File(fileMetadata.originalFileLocation()));\n-                    byte[] bytes = new byte[RANDOMLY_CHOSEN_BUFFER_SIZE_THAT_SEEMS_TO_WORK];\n-\n-                    // read the v1 file\n-                    int readLast = 0;\n-                    while (readLast != -1) {\n-                        readLast = inputStream.read(bytes);\n-                        if (readLast != 0 && readLast != -1) {\n-                            // write the v1 file to the v2 location\n-                            internalFilePersistence.write(bytes, 0, readLast);\n-                            bytes = new byte[RANDOMLY_CHOSEN_BUFFER_SIZE_THAT_SEEMS_TO_WORK];\n-                        }\n+                    internalFilePersistence.close();\n+                    if (inputStream != null) {\n+                        inputStream.close();\n                     }\n                 } catch (IOException e) {\n                     Log.e(getClass().getSimpleName(), e.getMessage());\n                     e.printStackTrace();\n-                } finally {\n-                    try {\n-                        internalFilePersistence.close();\n-                        if (inputStream != null) {\n-                            inputStream.close();\n-                        }\n-                    } catch (IOException e) {\n-                        Log.e(getClass().getSimpleName(), e.getMessage());\n-                        e.printStackTrace();\n-                    }\n                 }\n             }\n         }\n     }\n \n-    private void migrateV1DataToV2Database(List<Migration> migrations) {\n-        for (Migration migration : migrations) {\n-            Batch batch = migration.batch();\n-\n-            downloadsPersistence.startTransaction();\n-\n-            DownloadBatchTitle downloadBatchTitle = new LiteDownloadBatchTitle(batch.getTitle());\n-            DownloadsBatchPersisted persistedBatch = new LiteDownloadsBatchPersisted(downloadBatchTitle, batch.getDownloadBatchId(), Status.DOWNLOADED);\n-            downloadsPersistence.persistBatch(persistedBatch);\n-\n-            for (Migration.FileMetadata fileMetadata : migration.getFileMetadata()) {\n-                String url = fileMetadata.uri();\n-\n-                FileName fileName = LiteFileName.from(batch, url);\n-                FilePath filePath = FilePathCreator.create(fileName.name());\n-                DownloadFileId downloadFileId = DownloadFileId.from(batch);\n-                DownloadsFilePersisted persistedFile = new LiteDownloadsFilePersisted(\n-                        batch.getDownloadBatchId(),\n-                        downloadFileId,\n-                        fileName,\n-                        filePath,\n-                        fileMetadata.fileSize().totalSize(),\n-                        url,\n-                        FilePersistenceType.INTERNAL\n-                );\n-                downloadsPersistence.persistFile(persistedFile);\n-            }\n-\n-            downloadsPersistence.transactionSuccess();\n-            downloadsPersistence.endTransaction();\n+    private void migrateV1DataToV2Database(Migration migration) {\n+        Batch batch = migration.batch();\n+\n+        DownloadBatchTitle downloadBatchTitle = new LiteDownloadBatchTitle(batch.getTitle());\n+        DownloadsBatchPersisted persistedBatch = new LiteDownloadsBatchPersisted(downloadBatchTitle, batch.getDownloadBatchId(), Status.DOWNLOADED);\n+        downloadsPersistence.persistBatch(persistedBatch);\n+\n+        for (Migration.FileMetadata fileMetadata : migration.getFileMetadata()) {\n+            String url = fileMetadata.uri();\n+\n+            FileName fileName = LiteFileName.from(batch, url);\n+            FilePath filePath = FilePathCreator.create(fileName.name());\n+            DownloadFileId downloadFileId = DownloadFileId.from(batch);\n+            DownloadsFilePersisted persistedFile = new LiteDownloadsFilePersisted(\n+                    batch.getDownloadBatchId(),\n+                    downloadFileId,\n+                    fileName,\n+                    filePath,\n+                    fileMetadata.fileSize().totalSize(),\n+                    url,\n+                    FilePersistenceType.INTERNAL\n+            );\n+            downloadsPersistence.persistFile(persistedFile);\n         }\n     }\n \n     // TODO: See 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batch.getDownloadBatchId().stringValue());","path":"library/src/main/java/com/novoda/downloadmanager/VersionOneToVersionTwoMigrator.java","position":171,"original_position":171,"commit_id":"99b4fc3b2d1b564e73a544e9f336da7f08907737","original_commit_id":"99b4fc3b2d1b564e73a544e9f336da7f08907737","user":{"login":"Mecharyry","id":3380092,"avatar_url":"https://avatars1.githubusercontent.com/u/3380092?v=4","gravatar_id":"","url":"https://api.github.com/users/Mecharyry","html_url":"https://github.com/Mecharyry","followers_url":"https://api.github.com/users/Mecharyry/followers","following_url":"https://api.github.com/users/Mecharyry/following{/other_user}","gists_url":"https://api.github.com/users/Mecharyry/gists{/gist_id}","starred_url":"https://api.github.com/users/Mecharyry/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/Mecharyry/subscriptions","organizations_url":"https://api.github.com/users/Mecharyry/orgs","repos_url":"https://api.github.com/users/Mecharyry/repos","events_url":"https://api.github.com/users/Mecharyry/events{/privacy}","received_events_url":"https://api.github.com/users/Mecharyry/received_events","type":"User","site_admin":false},"body":"This wasn't working before but it didn't matter because we just dropped the whole db anyway 😂 ","created_at":"2017-12-13T09:14:52Z","updated_at":"2017-12-13T09:14:52Z","html_url":"https://github.com/novoda/download-manager/pull/271#discussion_r156598830","pull_request_url":"https://api.github.com/repos/novoda/download-manager/pulls/271","author_association":"OWNER","_links":{"self":{"href":"https://api.github.com/repos/novoda/download-manager/pulls/comments/156598830"},"html":{"href":"https://github.com/novoda/download-manager/pull/271#discussion_r156598830"},"pull_request":{"href":"https://api.github.com/repos/novoda/download-manager/pulls/271"}}},"pull_request":{"url":"https://api.github.com/repos/novoda/download-manager/pulls/271","id":158038348,"html_url":"https://github.com/novoda/download-manager/pull/271","diff_url":"https://github.com/novoda/download-manager/pull/271.diff","patch_url":"https://github.com/novoda/download-manager/pull/271.patch","issue_url":"https://api.github.com/repos/novoda/download-manager/issues/271","number":271,"state":"open","locked":false,"title":"Batch by batch migration","user":{"login":"Mecharyry","id":3380092,"avatar_url":"https://avatars1.githubusercontent.com/u/3380092?v=4","gravatar_id":"","url":"https://api.github.com/users/Mecharyry","html_url":"https://github.com/Mecharyry","followers_url":"https://api.github.com/users/Mecharyry/followers","following_url":"https://api.github.com/users/Mecharyry/following{/other_user}","gists_url":"https://api.github.com/users/Mecharyry/gists{/gist_id}","starred_url":"https://api.github.com/users/Mecharyry/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/Mecharyry/subscriptions","organizations_url":"https://api.github.com/users/Mecharyry/orgs","repos_url":"https://api.github.com/users/Mecharyry/repos","events_url":"https://api.github.com/users/Mecharyry/events{/privacy}","received_events_url":"https://api.github.com/users/Mecharyry/received_events","type":"User","site_admin":false},"body":"❌  DO NOT MERGE, waiting for #268 to be merged first ❌ \r\n\r\n### Problem\r\nThe migration from the v1 database to the v2 database can be stopped at any point if the system runs out of resources. This can currently leave the migration process in an inconsistent state because we process in steps e.g. move files and then move the data.\r\n\r\n### Solution\r\nPerform the migration in batches, where the migration of a batch is performed in a transaction. If the transaction never completes the changes will be rolled back leaving the databases in a consistent state. 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