[
https://issues.apache.org/jira/browse/HIVE-25397?focusedWorklogId=661996&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-661996
]
ASF GitHub Bot logged work on HIVE-25397:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 07/Oct/21 23:07
Start Date: 07/Oct/21 23:07
Worklog Time Spent: 10m
Work Description: ayushtkn commented on a change in pull request #2539:
URL: https://github.com/apache/hive/pull/2539#discussion_r724067080
##########
File path: ql/src/java/org/apache/hadoop/hive/ql/exec/repl/ReplDumpTask.java
##########
@@ -1105,17 +1105,13 @@ Long bootStrapDump(Path dumpRoot, DumpMetaData dmd,
Path cmRoot, Hive hiveDb)
boolean isExternalTablePresent = false;
String snapshotPrefix = dbName.toLowerCase();
- ArrayList<String> prevSnaps = new ArrayList<>(); // Will stay empty
in case of bootstrap
+ ArrayList<String> prevSnaps = new ArrayList<>();
if (isSnapshotEnabled) {
- // Delete any old existing snapshot file, We always start fresh in
case of bootstrap.
-
FileUtils.deleteIfExists(getDFS(SnapshotUtils.getSnapshotFileListPath(dumpRoot),
conf),
- new Path(SnapshotUtils.getSnapshotFileListPath(dumpRoot),
- EximUtil.FILE_LIST_EXTERNAL_SNAPSHOT_CURRENT));
-
FileUtils.deleteIfExists(getDFS(SnapshotUtils.getSnapshotFileListPath(dumpRoot),
conf),
Review comment:
Check if we need to preserve
##########
File path:
itests/hive-unit/src/test/java/org/apache/hadoop/hive/ql/parse/TestReplicationScenariosUsingSnapshots.java
##########
@@ -201,7 +218,10 @@ public void testBasicReplicationWithSnapshots() throws
Throwable {
public void testBasicStartFromIncrementalReplication() throws Throwable {
// Run a cycle of dump & load with snapshot disabled.
- ArrayList<String> withClause = new ArrayList<>(1);
+ ArrayList<String> withClause = new ArrayList<>(3);
+ ArrayList<String> withClause2 = new ArrayList<>(3);
+ withClause.add("'" + HiveConf.ConfVars.REPLDIR.varname + "'='" +
primary.repldDir + "'");
+ withClause2.add("'" + HiveConf.ConfVars.REPLDIR.varname + "'='" +
primary.repldDir + "'");
Review comment:
Give a check why twice?
##########
File path:
ql/src/java/org/apache/hadoop/hive/ql/exec/repl/ReplExternalTables.java
##########
@@ -192,64 +196,138 @@ private void dirLocationToCopy(String tableName,
FileList fileList, Path sourceP
fileList.add(new DirCopyWork(tableName, sourcePath, targetPath, copyMode,
snapshotPrefix).convertToString());
}
- private SnapshotUtils.SnapshotCopyMode createSnapshotsAtSource(Path
sourcePath, String snapshotPrefix,
- boolean isSnapshotEnabled, HiveConf conf,
SnapshotUtils.ReplSnapshotCount replSnapshotCount, FileList snapPathFileList,
- ArrayList<String> prevSnaps, boolean isBootstrap) throws IOException {
+ private Map<String, SnapshotUtils.SnapshotCopyMode>
createSnapshotsAtSource(Path sourcePath, Path targetPath, String snapshotPrefix,
+
boolean isSnapshotEnabled, HiveConf conf, SnapshotUtils.ReplSnapshotCount
replSnapshotCount, FileList snapPathFileList,
+
ArrayList<String> prevSnaps, boolean isBootstrap) throws IOException {
+ Map<String, SnapshotUtils.SnapshotCopyMode> ret = new HashMap<>();
+ ret.put(snapshotPrefix, FALLBACK_COPY);
if (!isSnapshotEnabled) {
LOG.info("Snapshot copy not enabled for path {} Will use normal distCp
for copying data.", sourcePath);
- return FALLBACK_COPY;
+ return ret;
}
+ String prefix = snapshotPrefix;
+ SnapshotUtils.SnapshotCopyMode copyMode = FALLBACK_COPY;
DistributedFileSystem sourceDfs = SnapshotUtils.getDFS(sourcePath, conf);
try {
- if(isBootstrap) {
- // Delete any pre existing snapshots.
- SnapshotUtils.deleteSnapshotIfExists(sourceDfs, sourcePath,
firstSnapshot(snapshotPrefix), conf);
- SnapshotUtils.deleteSnapshotIfExists(sourceDfs, sourcePath,
secondSnapshot(snapshotPrefix), conf);
- allowAndCreateInitialSnapshot(sourcePath, snapshotPrefix, conf,
replSnapshotCount, snapPathFileList, sourceDfs);
- return INITIAL_COPY;
+ if(conf.getBoolVar(HiveConf.ConfVars.REPL_REUSE_SNAPSHOTS)) {
+ try {
+ FileStatus[] listing = sourceDfs.listStatus(new Path(sourcePath,
".snapshot"));
+ for (FileStatus elem : listing) {
+ String snapShotName = elem.getPath().getName();
+ if (snapShotName.contains(OLD_SNAPSHOT)) {
+ prefix = snapShotName.substring(0,
snapShotName.lastIndexOf(OLD_SNAPSHOT));
+ break;
+ }
+ if (snapShotName.contains(NEW_SNAPSHOT)) {
+ prefix = snapShotName.substring(0,
snapShotName.lastIndexOf(NEW_SNAPSHOT));
+ break;
+ }
+ }
+ ret.clear();
+ ret.put(prefix, copyMode);
+ snapshotPrefix = prefix;
+ } catch (SnapshotException e) {
+ //dir not snapshottable, continue
+ }
}
+ boolean firstSnapAvailable =
+ SnapshotUtils.isSnapshotAvailable(sourceDfs, sourcePath,
snapshotPrefix, OLD_SNAPSHOT, conf);
+ boolean secondSnapAvailable =
+ SnapshotUtils.isSnapshotAvailable(sourceDfs, sourcePath,
snapshotPrefix, NEW_SNAPSHOT, conf);
+ //While resuming a failed replication
if (prevSnaps.contains(sourcePath.toString())) {
// We already created a snapshot for this, just refresh the latest
snapshot and leave.
- sourceDfs.deleteSnapshot(sourcePath, secondSnapshot(snapshotPrefix));
+ // In case of reverse replication after failover, in some paths,
second snapshot may not be present.
+ SnapshotUtils.deleteSnapshotIfExists(sourceDfs, sourcePath,
secondSnapshot(snapshotPrefix), conf);
replSnapshotCount.incrementNumDeleted();
SnapshotUtils.createSnapshot(sourceDfs, sourcePath,
secondSnapshot(snapshotPrefix), conf);
- replSnapshotCount.incrementNumCreated();
Review comment:
revert this
##########
File path:
ql/src/java/org/apache/hadoop/hive/ql/exec/repl/util/SnapshotUtils.java
##########
@@ -275,17 +275,17 @@ public static void renameSnapshot(FileSystem fs, Path
snapshotPath, String sourc
/**
* Deletes the snapshots present in the list.
- * @param dfs DistributedFileSystem.
* @param diffList Elements to be deleted.
* @param prefix Prefix used in snapshot names,
* @param snapshotCount snapshot counter to track the number of snapshots
deleted.
* @param conf the Hive Configuration.
* @throws IOException in case of any error.
*/
- private static void cleanUpSnapshots(DistributedFileSystem dfs,
ArrayList<String> diffList, String prefix,
+ private static void cleanUpSnapshots(ArrayList<String> diffList, String
prefix,
ReplSnapshotCount snapshotCount, HiveConf conf) throws IOException {
for (String path : diffList) {
Path snapshotPath = new Path(path);
+ DistributedFileSystem dfs = (DistributedFileSystem)
snapshotPath.getFileSystem(conf);
Review comment:
It is creating DFS in loop, can make it create only once
##########
File path: common/src/java/org/apache/hadoop/hive/common/FileUtils.java
##########
@@ -705,6 +705,16 @@ public static boolean distCpWithSnapshot(String
oldSnapshot, String newSnapshot,
oldSnapshot, newSnapshot);
} catch (IOException e) {
LOG.error("Can not copy using snapshot from source: {}, target: {}",
srcPaths, dst);
+ try {
+ // in case overwriteTarget is set to false, and we encounter an
exception due to targetFs getting
+ // changed since last snapshot, then fallback to initial copy
+ if (!overwriteTarget && !e.getCause().getMessage().contains("changed
since snapshot")) {
+ LOG.warn("Diff copy failed due to changed target filesystem, falling
back to normal distcp.");
+ return distCp(srcPaths.get(0).getFileSystem(conf), srcPaths, dst,
false, proxyUser, conf, shims);
Review comment:
use the snapshot to copy, you can keep it where rdiff is being done
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Issue Time Tracking
-------------------
Worklog Id: (was: 661996)
Time Spent: 2h 20m (was: 2h 10m)
> Snapshot support for controlled failover
> ----------------------------------------
>
> Key: HIVE-25397
> URL: https://issues.apache.org/jira/browse/HIVE-25397
> Project: Hive
> Issue Type: Bug
> Reporter: Arko Sharma
> Assignee: Arko Sharma
> Priority: Major
> Labels: pull-request-available
> Time Spent: 2h 20m
> Remaining Estimate: 0h
>
> In case the same locations are used for external tables on the source and
> target, then the snapshots created during replication can be re-used during
> reverse replication. This patch enables re-using the snapshots during
> reverse replication using a configuration.
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