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Switches TranslogStreams to check a header in the file to determine the translog format, delegating to the version-specific stream. Version 1 of the translog format writes a header using Lucene's CodecUtil at the beginning of the file and appends a checksum for each translog operation written. Also refactors much of the translog operations, such as merging .hasNext() and .next() in FsChannelSnapshot Relates to #6554
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74 changes: 74 additions & 0 deletions
74
src/main/java/org/elasticsearch/index/translog/BufferedChecksumStreamInput.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,74 @@ | ||
| /* | ||
| * Licensed to Elasticsearch under one or more contributor | ||
| * license agreements. See the NOTICE file distributed with | ||
| * this work for additional information regarding copyright | ||
| * ownership. Elasticsearch 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.elasticsearch.index.translog; | ||
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| import org.apache.lucene.store.BufferedChecksum; | ||
| import org.elasticsearch.common.io.stream.StreamInput; | ||
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| import java.io.IOException; | ||
| import java.util.zip.CRC32; | ||
| import java.util.zip.Checksum; | ||
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| /** | ||
| * Similar to Lucene's BufferedChecksumIndexInput, however this wraps a | ||
| * {@link StreamInput} so anything read will update the checksum | ||
| */ | ||
| public final class BufferedChecksumStreamInput extends StreamInput { | ||
| private final StreamInput in; | ||
| private final Checksum digest; | ||
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| public BufferedChecksumStreamInput(StreamInput in) { | ||
| this.in = in; | ||
| this.digest = new BufferedChecksum(new CRC32()); | ||
| } | ||
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| public long getChecksum() { | ||
| return this.digest.getValue(); | ||
| } | ||
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| @Override | ||
| public byte readByte() throws IOException { | ||
| final byte b = in.readByte(); | ||
| digest.update(b); | ||
| return b; | ||
| } | ||
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| @Override | ||
| public void readBytes(byte[] b, int offset, int len) throws IOException { | ||
| in.readBytes(b, offset, len); | ||
| digest.update(b, offset, len); | ||
| } | ||
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| @Override | ||
| public void reset() throws IOException { | ||
| in.reset(); | ||
| digest.reset(); | ||
| } | ||
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| @Override | ||
| public int read() throws IOException { | ||
| return readByte() & 0xFF; | ||
| } | ||
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| @Override | ||
| public void close() throws IOException { | ||
| in.close(); | ||
| } | ||
| } |
73 changes: 73 additions & 0 deletions
73
src/main/java/org/elasticsearch/index/translog/BufferedChecksumStreamOutput.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,73 @@ | ||
| /* | ||
| * Licensed to Elasticsearch under one or more contributor | ||
| * license agreements. See the NOTICE file distributed with | ||
| * this work for additional information regarding copyright | ||
| * ownership. Elasticsearch 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.elasticsearch.index.translog; | ||
|
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| import org.apache.lucene.store.BufferedChecksum; | ||
| import org.elasticsearch.common.io.stream.StreamOutput; | ||
|
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| import java.io.IOException; | ||
| import java.util.zip.CRC32; | ||
| import java.util.zip.Checksum; | ||
|
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| /** | ||
| * Similar to Lucene's BufferedChecksumIndexOutput, however this wraps a | ||
| * {@link StreamOutput} so anything written will update the checksum | ||
| */ | ||
| public final class BufferedChecksumStreamOutput extends StreamOutput { | ||
| private final StreamOutput out; | ||
| private final Checksum digest; | ||
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| public BufferedChecksumStreamOutput(StreamOutput out) { | ||
| this.out = out; | ||
| this.digest = new BufferedChecksum(new CRC32()); | ||
| } | ||
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| public long getChecksum() { | ||
| return this.digest.getValue(); | ||
| } | ||
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| @Override | ||
| public void writeByte(byte b) throws IOException { | ||
| out.writeByte(b); | ||
| digest.update(b); | ||
| } | ||
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| @Override | ||
| public void writeBytes(byte[] b, int offset, int length) throws IOException { | ||
| out.writeBytes(b, offset, length); | ||
| digest.update(b, offset, length); | ||
| } | ||
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| @Override | ||
| public void flush() throws IOException { | ||
| out.flush(); | ||
| } | ||
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| @Override | ||
| public void close() throws IOException { | ||
| out.close(); | ||
| } | ||
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| @Override | ||
| public void reset() throws IOException { | ||
| out.reset(); | ||
| digest.reset(); | ||
| } | ||
| } |
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