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[Core] Support create and delete branch (apache#2703)
* [Core]Support create and delete branch
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136
paimon-core/src/main/java/org/apache/paimon/utils/BranchManager.java
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| @@ -0,0 +1,136 @@ | ||
| /* | ||
| * 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.utils; | ||
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| import org.apache.paimon.Snapshot; | ||
| import org.apache.paimon.fs.FileIO; | ||
| import org.apache.paimon.fs.Path; | ||
| import org.apache.paimon.schema.SchemaManager; | ||
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| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
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| import java.io.IOException; | ||
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| import static org.apache.paimon.utils.Preconditions.checkArgument; | ||
|
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| /** Manager for {@code Branch}. */ | ||
| public class BranchManager { | ||
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| private static final Logger LOG = LoggerFactory.getLogger(BranchManager.class); | ||
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| public static final String BRANCH_PREFIX = "branch-"; | ||
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| private final FileIO fileIO; | ||
| private final Path tablePath; | ||
| private final SnapshotManager snapshotManager; | ||
| private final TagManager tagManager; | ||
| private final SchemaManager schemaManager; | ||
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| public BranchManager( | ||
| FileIO fileIO, | ||
| Path path, | ||
| SnapshotManager snapshotManager, | ||
| TagManager tagManager, | ||
| SchemaManager schemaManager) { | ||
| this.fileIO = fileIO; | ||
| this.tablePath = path; | ||
| this.snapshotManager = snapshotManager; | ||
| this.tagManager = tagManager; | ||
| this.schemaManager = schemaManager; | ||
| } | ||
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| /** Return the root Directory of branch. */ | ||
| public Path branchDirectory() { | ||
| return new Path(tablePath + "/branch"); | ||
| } | ||
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| /** Return the path string of a branch. */ | ||
| public static String getBranchPath(Path tablePath, String branchName) { | ||
| return tablePath.toString() + "/branch/" + BRANCH_PREFIX + branchName; | ||
| } | ||
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| /** Return the path of a branch. */ | ||
| public Path branchPath(String branchName) { | ||
| return new Path(getBranchPath(tablePath, branchName)); | ||
| } | ||
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| public void createBranch(String branchName, String tagName) { | ||
| checkArgument(!StringUtils.isBlank(branchName), "Branch name '%s' is blank.", branchName); | ||
| checkArgument(!branchExists(branchName), "Branch name '%s' already exists.", branchName); | ||
| checkArgument(tagManager.tagExists(tagName), "Tag name '%s' not exists.", tagName); | ||
| checkArgument( | ||
| !branchName.chars().allMatch(Character::isDigit), | ||
| "Branch name cannot be pure numeric string but is '%s'.", | ||
| branchName); | ||
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| Snapshot snapshot = tagManager.taggedSnapshot(tagName); | ||
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| try { | ||
| // Copy the corresponding tag, snapshot and schema files into the branch directory | ||
| fileIO.copyFileUtf8( | ||
| tagManager.tagPath(tagName), tagManager.branchTagPath(branchName, tagName)); | ||
| fileIO.copyFileUtf8( | ||
| snapshotManager.snapshotPath(snapshot.id()), | ||
| snapshotManager.branchSnapshotPath(branchName, snapshot.id())); | ||
| fileIO.copyFileUtf8( | ||
| schemaManager.toSchemaPath(snapshot.schemaId()), | ||
| schemaManager.branchSchemaPath(branchName, snapshot.schemaId())); | ||
| } catch (IOException e) { | ||
| throw new RuntimeException( | ||
| String.format( | ||
| "Exception occurs when create branch '%s' (directory in %s).", | ||
| branchName, getBranchPath(tablePath, branchName)), | ||
| e); | ||
| } | ||
| } | ||
|
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| public void deleteBranch(String branchName) { | ||
| checkArgument(branchExists(branchName), "Branch name '%s' doesn't exist.", branchName); | ||
| try { | ||
| // Delete branch directory | ||
| fileIO.delete(branchPath(branchName), true); | ||
| } catch (IOException e) { | ||
| LOG.info( | ||
| String.format( | ||
| "Deleting the branch failed due to an exception in deleting the directory %s. Please try again.", | ||
| getBranchPath(tablePath, branchName)), | ||
| e); | ||
| } | ||
| } | ||
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| /** Check if path exists. */ | ||
| public boolean fileExists(Path path) { | ||
| try { | ||
| if (fileIO.exists(path)) { | ||
| return true; | ||
| } | ||
| return false; | ||
| } catch (IOException e) { | ||
| throw new RuntimeException( | ||
| String.format("Failed to determine if path '%s' exists.", path), e); | ||
| } | ||
| } | ||
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| /** Check if a branch exists. */ | ||
| public boolean branchExists(String branchName) { | ||
| Path branchPath = branchPath(branchName); | ||
| return fileExists(branchPath); | ||
| } | ||
| } |
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