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

Signed-off-by: Wei-Chiu Chuang <weichiu@apache.org>
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Ayush Saxena 2021-04-08 20:49:08 +05:30 committed by GitHub
parent 4c567fcff7
commit c6539e3289
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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.security.AccessControlException;
import org.apache.hadoop.thirdparty.com.google.common.annotations.VisibleForTesting;
import org.apache.hadoop.thirdparty.com.google.common.base.Preconditions;
@ -2388,8 +2389,15 @@ public class DistributedFileSystem extends FileSystem
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.
LOG.warn("Falling back to getSnapshotDiffReport {}", e.getMessage());
return dfs.getSnapshotDiffReport(snapshotDir, fromSnapshot, toSnapshot);
}
startPath = report.getLastPath();
index = report.getLastIndex();
modifiedList.addAll(report.getModifyList());