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Refactor hoodie-common and create right abstractions for Hoodie Storage V2.0

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The following is the gist of changes done

- All low-level operation of creating a commit code was in HoodieClient which made it hard to share code if there was a compaction commit.
- HoodieTableMetadata contained a mix of metadata and filtering files. (Also few operations required FileSystem to be passed in because those were called from TaskExecutors and others had FileSystem as a global variable). Since merge-on-read requires a lot of that code, but will have to change slightly on how it operates on the metadata and how it filters the files. The two set of operation are split into HoodieTableMetaClient and TableFileSystemView.
- Everything (active commits, archived commits, cleaner log, save point log and in future delta and compaction commits) in HoodieTableMetaClient is a HoodieTimeline. Timeline is a series of instants, which has an in-built concept of inflight and completed commit markers.
- A timeline can be queries for ranges, contains and also use to create new datapoint (create a new commit etc). Commit (and all the above metadata) creation/deletion is streamlined in a timeline
- Multiple timelines can be merged into a single timeline, giving us an audit timeline to whatever happened in a hoodie dataset. This also helps with #55.
- Move to java 8 and introduce java 8 succinct syntax in refactored code
This commit is contained in:
Prasanna Rajaperumal
2017-01-04 14:40:26 -08:00
parent 283269e57f
commit 8ee777a9bb
76 changed files with 3480 additions and 1932 deletions
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21
hoodie-utilities/src/main/java/com/uber/hoodie/utilities/HiveIncrementalPuller.java
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@@ -18,7 +18,7 @@ package com.uber.hoodie.utilities;
import com.beust.jcommander.JCommander;
import com.beust.jcommander.Parameter;
import com.uber.hoodie.common.model.HoodieTableMetadata;
import com.uber.hoodie.common.table.HoodieTableMetaClient;
import com.uber.hoodie.exception.HoodieException;
import com.uber.hoodie.utilities.exception.HoodieIncrementalPullException;
import com.uber.hoodie.utilities.exception.HoodieIncrementalPullSQLException;
@@ -44,7 +44,9 @@ import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.List;
import java.util.Optional;
import java.util.Scanner;
import java.util.stream.Collectors;
/**
* Utility to pull data after a given commit, based on the supplied HiveQL and save the delta as another hive temporary table.
@@ -263,9 +265,10 @@ public class HiveIncrementalPuller {
if(!fs.exists(new Path(targetDataPath)) || !fs.exists(new Path(targetDataPath + "/.hoodie"))) {
return "0";
}
HoodieTableMetadata metadata = new HoodieTableMetadata(fs, targetDataPath);
String lastCommit = metadata.getAllCommits().lastCommit();
return lastCommit == null ? "0" : lastCommit;
HoodieTableMetaClient metadata = new HoodieTableMetaClient(fs, targetDataPath);
Optional<String> lastCommit = metadata.getActiveCommitTimeline().lastInstant();
return lastCommit.orElse("0");
}
private boolean ensureTempPathExists(FileSystem fs, String lastCommitTime)
@@ -295,12 +298,14 @@ public class HiveIncrementalPuller {
}
private String getLastCommitTimePulled(FileSystem fs, String sourceTableLocation) throws IOException {
HoodieTableMetadata metadata = new HoodieTableMetadata(fs, sourceTableLocation);
List<String> commitsToSync =
metadata.getAllCommits().findCommitsAfter(config.fromCommitTime, config.maxCommits);
HoodieTableMetaClient metadata = new HoodieTableMetaClient(fs, sourceTableLocation);
List<String> commitsToSync = metadata.getActiveCommitTimeline()
.findInstantsAfter(config.fromCommitTime, config.maxCommits)
.collect(Collectors.toList());
if (commitsToSync.isEmpty()) {
log.warn("Nothing to sync. All commits in " + config.sourceTable + " are " + metadata
.getAllCommits().getCommitList() + " and from commit time is " + config.fromCommitTime);
.getActiveCommitTimeline().getInstants().collect(Collectors.toList())
+ " and from commit time is " + config.fromCommitTime);
return null;
}
log.info("Syncing commits " + commitsToSync);