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[iceberg] Introduce feature to migrate table from iceberg to paimon (#…
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110 changes: 110 additions & 0 deletions
110
...on-core/src/main/java/org/apache/paimon/iceberg/migrate/IcebergMigrateHadoopMetadata.java
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| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF licenses this file | ||
| * to you under the Apache License, Version 2.0 (the | ||
| * "License"); you may not use this file except in compliance | ||
| * with the License. You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
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| package org.apache.paimon.iceberg.migrate; | ||
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| import org.apache.paimon.catalog.Identifier; | ||
| import org.apache.paimon.fs.FileIO; | ||
| import org.apache.paimon.fs.Path; | ||
| import org.apache.paimon.iceberg.IcebergPathFactory; | ||
| import org.apache.paimon.iceberg.metadata.IcebergMetadata; | ||
| import org.apache.paimon.options.Options; | ||
| import org.apache.paimon.utils.Preconditions; | ||
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| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
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| import java.io.IOException; | ||
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| /** Get iceberg table latest snapshot metadata in hadoop. */ | ||
| public class IcebergMigrateHadoopMetadata implements IcebergMigrateMetadata { | ||
| private static final Logger LOG = LoggerFactory.getLogger(IcebergMigrateHadoopMetadata.class); | ||
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| private static final String VERSION_HINT_FILENAME = "version-hint.text"; | ||
| private static final String ICEBERG_WAREHOUSE = "iceberg_warehouse"; | ||
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| private final FileIO fileIO; | ||
| private final Identifier icebergIdentifier; | ||
| private final Options icebergOptions; | ||
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| private Path icebergLatestMetaVersionPath; | ||
| private IcebergPathFactory icebergMetaPathFactory; | ||
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| public IcebergMigrateHadoopMetadata( | ||
| Identifier icebergIdentifier, FileIO fileIO, Options icebergOptions) { | ||
| this.fileIO = fileIO; | ||
| this.icebergIdentifier = icebergIdentifier; | ||
| this.icebergOptions = icebergOptions; | ||
| } | ||
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| @Override | ||
| public IcebergMetadata icebergMetadata() { | ||
| Preconditions.checkArgument( | ||
| icebergOptions.get(ICEBERG_WAREHOUSE) != null, | ||
| "'iceberg_warehouse' is null. " | ||
| + "In hadoop-catalog, you should explicitly set this argument for finding iceberg metadata."); | ||
| this.icebergMetaPathFactory = | ||
| new IcebergPathFactory( | ||
| new Path( | ||
| icebergOptions.get(ICEBERG_WAREHOUSE), | ||
| new Path( | ||
| String.format( | ||
| "%s/%s/metadata", | ||
| icebergIdentifier.getDatabaseName(), | ||
| icebergIdentifier.getTableName())))); | ||
| long icebergLatestMetaVersion = getIcebergLatestMetaVersion(); | ||
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| this.icebergLatestMetaVersionPath = | ||
| icebergMetaPathFactory.toMetadataPath(icebergLatestMetaVersion); | ||
| LOG.info( | ||
| "iceberg latest snapshot metadata file location: {}", icebergLatestMetaVersionPath); | ||
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| return IcebergMetadata.fromPath(fileIO, icebergLatestMetaVersionPath); | ||
| } | ||
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| @Override | ||
| public String icebergLatestMetadataLocation() { | ||
| return icebergLatestMetaVersionPath.toString(); | ||
| } | ||
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| @Override | ||
| public void deleteOriginTable() { | ||
| Path tablePath = icebergMetaPathFactory.metadataDirectory().getParent(); | ||
| LOG.info("Iceberg table path to be deleted:{}", tablePath); | ||
| try { | ||
| if (fileIO.isDir(tablePath)) { | ||
| fileIO.deleteDirectoryQuietly(tablePath); | ||
| } | ||
| } catch (IOException e) { | ||
| LOG.warn("exception occurred when deleting origin table.", e); | ||
| } | ||
| } | ||
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| private long getIcebergLatestMetaVersion() { | ||
| Path versionHintPath = | ||
| new Path(icebergMetaPathFactory.metadataDirectory(), VERSION_HINT_FILENAME); | ||
| try { | ||
| return Integer.parseInt(fileIO.readFileUtf8(versionHintPath)); | ||
| } catch (IOException e) { | ||
| throw new RuntimeException( | ||
| "read iceberg version-hint.text failed. Iceberg metadata path: " | ||
| + icebergMetaPathFactory.metadataDirectory(), | ||
| e); | ||
| } | ||
| } | ||
| } |
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