lanyuanxiaoyao/hudi
1
0
Fork 0
Code Activity

Introducing HoodieLogFormat V2 with versioning support

Browse Source 
- 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
Download Patch File Download Diff File Expand all files Collapse all files

11
hoodie-client/src/main/java/com/uber/hoodie/table/HoodieMergeOnReadTable.java
View File

@@ -265,14 +265,15 @@ public class HoodieMergeOnReadTable<T extends HoodieRecordPayload> extends
.withFileExtension(HoodieLogFile.DELTA_EXTENSION).build();
Long numRollbackBlocks = 0L;
// generate metadata
Map<HoodieLogBlock.LogMetadataType, String> metadata = Maps.newHashMap();
metadata.put(HoodieLogBlock.LogMetadataType.INSTANT_TIME,
Map<HoodieLogBlock.HeaderMetadataType, String> header = Maps.newHashMap();
header.put(HoodieLogBlock.HeaderMetadataType.INSTANT_TIME,
metaClient.getActiveTimeline().lastInstant().get().getTimestamp());
metadata.put(HoodieLogBlock.LogMetadataType.TARGET_INSTANT_TIME, commit);
header.put(HoodieLogBlock.HeaderMetadataType.TARGET_INSTANT_TIME, commit);
header.put(HoodieLogBlock.HeaderMetadataType.COMMAND_BLOCK_TYPE,
String.valueOf(HoodieCommandBlock.HoodieCommandBlockTypeEnum.ROLLBACK_PREVIOUS_BLOCK.ordinal()));
// if update belongs to an existing log file
writer = writer.appendBlock(new HoodieCommandBlock(
HoodieCommandBlock.HoodieCommandBlockTypeEnum.ROLLBACK_PREVIOUS_BLOCK,
metadata));
header));
numRollbackBlocks++;
filesToNumBlocksRollback
.put(this.getMetaClient().getFs().getFileStatus(writer.getLogFile().getPath()),