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Add BlobStoreRepository#writeSnapshotIndexLatestBlob method #53189

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Add BlobStoreRepository#writeSnapshotIndexLatestBlob method #53189

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20 changes: 11 additions & 9 deletions server/src/main/java/org/elasticsearch/repositories/blobstore/BlobStoreRepository.java
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Original file line number Diff line number Diff line change
Expand Up @@ -1400,14 +1400,8 @@ public void onFailure(Exception e) {
writeAtomic(indexBlob,
BytesReference.bytes(filteredRepositoryData.snapshotsToXContent(XContentFactory.jsonBuilder(), writeShardGens)), true);
// write the current generation to the index-latest file
final BytesReference genBytes;
try (BytesStreamOutput bStream = new BytesStreamOutput()) {
bStream.writeLong(newGen);
genBytes = bStream.bytes();
}
logger.debug("Repository [{}] updating index.latest with generation [{}]", metadata.name(), newGen);

writeAtomic(INDEX_LATEST_BLOB, genBytes, false);
writeSnapshotIndexLatestBlob(newGen);

// Step 3: Update CS to reflect new repository generation.
clusterService.submitStateUpdateTask("set safe repository generation [" + metadata.name() + "][" + newGen + "]",
Expand Down Expand Up @@ -1499,11 +1493,19 @@ long latestIndexBlobId() throws IOException {
}
}

// package private for testing
long readSnapshotIndexLatestBlob() throws IOException {
protected long readSnapshotIndexLatestBlob() throws IOException {
return Numbers.bytesToLong(Streams.readFully(blobContainer().readBlob(INDEX_LATEST_BLOB)).toBytesRef());
}

protected void writeSnapshotIndexLatestBlob(long newGen) throws IOException {
final BytesReference genBytes;
try (BytesStreamOutput baos = new BytesStreamOutput()) {
baos.writeLong(newGen);
genBytes = baos.bytes();
}
writeAtomic(INDEX_LATEST_BLOB, genBytes, false);
}

private long listBlobsToGetLatestIndexId() throws IOException {
return latestGeneration(blobContainer().listBlobsByPrefix(INDEX_FILE_PREFIX).keySet());
}
Expand Down