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Refactor Translog metadata upload/download to write/read header and f…
…ooter via VersionedCodecStreamWrapper (#7953) Signed-off-by: Bhumika Saini <[email protected]>
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63 changes: 63 additions & 0 deletions
63
...src/main/java/org/opensearch/index/translog/transfer/TranslogTransferMetadataHandler.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,63 @@ | ||
| /* | ||
| * SPDX-License-Identifier: Apache-2.0 | ||
| * | ||
| * The OpenSearch Contributors require contributions made to | ||
| * this file be licensed under the Apache-2.0 license or a | ||
| * compatible open source license. | ||
| */ | ||
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| package org.opensearch.index.translog.transfer; | ||
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| import org.apache.lucene.store.IndexInput; | ||
| import org.apache.lucene.store.IndexOutput; | ||
| import org.opensearch.common.io.IndexIOStreamHandler; | ||
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| import java.io.IOException; | ||
| import java.util.HashMap; | ||
| import java.util.Map; | ||
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| /** | ||
| * Handler for {@link TranslogTransferMetadata} | ||
| * | ||
| * @opensearch.internal | ||
| */ | ||
| public class TranslogTransferMetadataHandler implements IndexIOStreamHandler<TranslogTransferMetadata> { | ||
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| /** | ||
| * Implements logic to read content from file input stream {@code indexInput} and parse into {@link TranslogTransferMetadata} | ||
| * | ||
| * @param indexInput file input stream | ||
| * @return content parsed to {@link TranslogTransferMetadata} | ||
| */ | ||
| @Override | ||
| public TranslogTransferMetadata readContent(IndexInput indexInput) throws IOException { | ||
| long primaryTerm = indexInput.readLong(); | ||
| long generation = indexInput.readLong(); | ||
| long minTranslogGeneration = indexInput.readLong(); | ||
| Map<String, String> generationToPrimaryTermMapper = indexInput.readMapOfStrings(); | ||
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| int count = generationToPrimaryTermMapper.size(); | ||
| TranslogTransferMetadata metadata = new TranslogTransferMetadata(primaryTerm, generation, minTranslogGeneration, count); | ||
| metadata.setGenerationToPrimaryTermMapper(generationToPrimaryTermMapper); | ||
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| return metadata; | ||
| } | ||
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| /** | ||
| * Implements logic to write content from {@code content} to file output stream {@code indexOutput} | ||
| * | ||
| * @param indexOutput file input stream | ||
| * @param content metadata content to be written | ||
| */ | ||
| @Override | ||
| public void writeContent(IndexOutput indexOutput, TranslogTransferMetadata content) throws IOException { | ||
| indexOutput.writeLong(content.getPrimaryTerm()); | ||
| indexOutput.writeLong(content.getGeneration()); | ||
| indexOutput.writeLong(content.getMinTranslogGeneration()); | ||
| if (content.getGenerationToPrimaryTermMapper() != null) { | ||
| indexOutput.writeMapOfStrings(content.getGenerationToPrimaryTermMapper()); | ||
| } else { | ||
| indexOutput.writeMapOfStrings(new HashMap<>()); | ||
| } | ||
| } | ||
| } |
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93 changes: 93 additions & 0 deletions
93
...est/java/org/opensearch/index/translog/transfer/TranslogTransferMetadataHandlerTests.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,93 @@ | ||
| /* | ||
| * SPDX-License-Identifier: Apache-2.0 | ||
| * | ||
| * The OpenSearch Contributors require contributions made to | ||
| * this file be licensed under the Apache-2.0 license or a | ||
| * compatible open source license. | ||
| */ | ||
|
|
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| package org.opensearch.index.translog.transfer; | ||
|
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| import org.apache.lucene.store.IndexInput; | ||
| import org.apache.lucene.store.OutputStreamIndexOutput; | ||
| import org.junit.Before; | ||
| import org.opensearch.common.bytes.BytesReference; | ||
| import org.opensearch.common.io.stream.BytesStreamOutput; | ||
| import org.opensearch.common.lucene.store.ByteArrayIndexInput; | ||
| import org.opensearch.test.OpenSearchTestCase; | ||
|
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| import java.io.IOException; | ||
| import java.util.HashMap; | ||
| import java.util.Map; | ||
|
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| public class TranslogTransferMetadataHandlerTests extends OpenSearchTestCase { | ||
| private TranslogTransferMetadataHandler handler; | ||
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| @Before | ||
| public void setUp() throws Exception { | ||
| super.setUp(); | ||
| handler = new TranslogTransferMetadataHandler(); | ||
| } | ||
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| public void testReadContent() throws IOException { | ||
| TranslogTransferMetadata expectedMetadata = getTestMetadata(); | ||
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| // Operation: Read expected metadata from source input stream. | ||
| IndexInput indexInput = new ByteArrayIndexInput("metadata file", getTestMetadataBytes()); | ||
| TranslogTransferMetadata actualMetadata = handler.readContent(indexInput); | ||
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| // Verification: Compare actual metadata read from the source input stream. | ||
| assertEquals(expectedMetadata, actualMetadata); | ||
| } | ||
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| public void testWriteContent() throws IOException { | ||
| TranslogTransferMetadata expectedMetadata = getTestMetadata(); | ||
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| // Operation: Write expected metadata to the target output stream. | ||
| BytesStreamOutput output = new BytesStreamOutput(); | ||
| OutputStreamIndexOutput actualMetadataStream = new OutputStreamIndexOutput("dummy bytes", "dummy stream", output, 4096); | ||
| handler.writeContent(actualMetadataStream, expectedMetadata); | ||
| actualMetadataStream.close(); | ||
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| // Verification: Compare actual metadata written to the target output stream. | ||
| IndexInput indexInput = new ByteArrayIndexInput("metadata file", BytesReference.toBytes(output.bytes())); | ||
| long primaryTerm = indexInput.readLong(); | ||
| long generation = indexInput.readLong(); | ||
| long minTranslogGeneration = indexInput.readLong(); | ||
| Map<String, String> generationToPrimaryTermMapper = indexInput.readMapOfStrings(); | ||
| int count = generationToPrimaryTermMapper.size(); | ||
| TranslogTransferMetadata actualMetadata = new TranslogTransferMetadata(primaryTerm, generation, minTranslogGeneration, count); | ||
| actualMetadata.setGenerationToPrimaryTermMapper(generationToPrimaryTermMapper); | ||
| assertEquals(expectedMetadata, actualMetadata); | ||
| } | ||
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| private TranslogTransferMetadata getTestMetadata() { | ||
| long primaryTerm = 3; | ||
| long generation = 500; | ||
| long minTranslogGeneration = 300; | ||
| Map<String, String> generationToPrimaryTermMapper = new HashMap<>(); | ||
| generationToPrimaryTermMapper.put("300", "1"); | ||
| generationToPrimaryTermMapper.put("400", "2"); | ||
| generationToPrimaryTermMapper.put("500", "3"); | ||
| int count = generationToPrimaryTermMapper.size(); | ||
| TranslogTransferMetadata metadata = new TranslogTransferMetadata(primaryTerm, generation, minTranslogGeneration, count); | ||
| metadata.setGenerationToPrimaryTermMapper(generationToPrimaryTermMapper); | ||
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| return metadata; | ||
| } | ||
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| private byte[] getTestMetadataBytes() throws IOException { | ||
| TranslogTransferMetadata metadata = getTestMetadata(); | ||
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| BytesStreamOutput output = new BytesStreamOutput(); | ||
| OutputStreamIndexOutput indexOutput = new OutputStreamIndexOutput("dummy bytes", "dummy stream", output, 4096); | ||
| indexOutput.writeLong(metadata.getPrimaryTerm()); | ||
| indexOutput.writeLong(metadata.getGeneration()); | ||
| indexOutput.writeLong(metadata.getMinTranslogGeneration()); | ||
| Map<String, String> generationToPrimaryTermMapper = metadata.getGenerationToPrimaryTermMapper(); | ||
| indexOutput.writeMapOfStrings(generationToPrimaryTermMapper); | ||
| indexOutput.close(); | ||
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| return BytesReference.toBytes(output.bytes()); | ||
| } | ||
| } |