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Introducing HoodieLogFormat V2 with versioning support

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- HoodieLogFormat V2 has support for LogFormat evolution through versioning
			- LogVersion is associated with a LogBlock not a LogFile
			- Based on a version for a LogBlock, approporiate code path is executed
		- Implemented LazyReading of Hoodie Log Blocks with Memory / IO tradeoff
		- Implemented Reverse pointer to be able to traverse the log in reverse
		- Introduce new MAGIC for backwards compatibility with logs without versions
This commit is contained in:
Nishith Agarwal
2018-02-15 11:01:25 -08:00
committed by vinoth chandar
parent dfd1979c51
commit 5405a6287b
32 changed files with 2066 additions and 677 deletions
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3
hoodie-hive/src/main/java/com/uber/hoodie/hive/HoodieHiveClient.java
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@@ -395,7 +395,7 @@ public class HoodieHiveClient {
@SuppressWarnings("OptionalUsedAsFieldOrParameterType")
private MessageType readSchemaFromLogFile(Optional<HoodieInstant> lastCompactionCommitOpt,
Path path) throws IOException {
Reader reader = HoodieLogFormat.newReader(fs, new HoodieLogFile(path), null, true);
Reader reader = HoodieLogFormat.newReader(fs, new HoodieLogFile(path), null);
HoodieAvroDataBlock lastBlock = null;
while (reader.hasNext()) {
HoodieLogBlock block = reader.next();
@@ -404,6 +404,7 @@ public class HoodieHiveClient {
}
}
if (lastBlock != null) {
lastBlock.getRecords();
return new parquet.avro.AvroSchemaConverter().convert(lastBlock.getSchema());
}
// Fall back to read the schema from last compaction