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HDFS-15916. DistCp: Backward compatibility: Distcp fails from Hadoop 3 to Hadoop 2 for snapshotdiff. (#2863). Contributed by Ayush Saxena. (#3054) 

Signed-off-by: Wei-Chiu Chuang <weichiu@apache.org>
(cherry picked from commit c6539e3289)

 Conflicts:
	hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DistributedFileSystem.java

Co-authored-by: Ayush Saxena <ayushsaxena@apache.org>
This commit is contained in:
Wei-Chiu Chuang 2021-06-08 19:32:34 -07:00 committed by GitHub
parent 8f0ba9ee1b
commit 83d119fe94
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1 changed files with 10 additions and 2 deletions
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12
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DistributedFileSystem.java
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@ -19,6 +19,7 @@
package org.apache.hadoop.hdfs;
import org.apache.hadoop.ipc.RpcNoSuchMethodException;
import org.apache.hadoop.thirdparty.com.google.common.annotations.VisibleForTesting;
import org.apache.hadoop.thirdparty.com.google.common.base.Preconditions;
import org.apache.hadoop.thirdparty.com.google.common.collect.Lists;
@ -2314,8 +2315,15 @@ private SnapshotDiffReport getSnapshotDiffReportInternal(
List<DiffReportListingEntry> deletedList = new ChunkedArrayList<>();
SnapshotDiffReportListing report;
do {
report = dfs.getSnapshotDiffReportListing(snapshotDir, fromSnapshot,
toSnapshot, startPath, index);
try {
report = dfs.getSnapshotDiffReportListing(snapshotDir, fromSnapshot,
toSnapshot, startPath, index);
} catch (RpcNoSuchMethodException e) {
// In case the server doesn't support getSnapshotDiffReportListing,
// fallback to getSnapshotDiffReport.
DFSClient.LOG.warn("Falling back to getSnapshotDiffReport {}", e.getMessage());
return dfs.getSnapshotDiffReport(snapshotDir, fromSnapshot, toSnapshot);
}
startPath = report.getLastPath();
index = report.getLastIndex();
modifiedList.addAll(report.getModifyList());