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HDFS-16538. EC decoding failed due to not enough valid inputs #4167

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Merged
tasanuma merged 1 commit into from
Apr 19, 2022
Merged

HDFS-16538. EC decoding failed due to not enough valid inputs #4167

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4 changes: 3 additions & 1 deletion ...project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/StatefulStripeReader.java
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Original file line number Diff line number Diff line change
Expand Up @@ -52,7 +52,9 @@ void prepareDecodeInputs() {
cur = dfsStripedInputStream.getCurStripeBuf().duplicate();
}

this.decodeInputs = new ECChunk[dataBlkNum + parityBlkNum];
if (this.decodeInputs == null) {
this.decodeInputs = new ECChunk[dataBlkNum + parityBlkNum];
}
int bufLen = (int) alignedStripe.getSpanInBlock();
int bufOff = (int) alignedStripe.getOffsetInBlock();
for (int i = 0; i < dataBlkNum; i++) {
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18 changes: 18 additions & 0 deletions ...ect/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestReadStripedFileWithDecoding.java
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Original file line number Diff line number Diff line change
Expand Up @@ -44,6 +44,7 @@
import java.io.IOException;
import java.nio.ByteBuffer;

import static org.apache.hadoop.hdfs.ReadStripedFileWithDecodingHelper.BLOCK_SIZE;
import static org.apache.hadoop.hdfs.ReadStripedFileWithDecodingHelper.CELL_SIZE;
import static org.apache.hadoop.hdfs.ReadStripedFileWithDecodingHelper.NUM_DATA_UNITS;
import static org.apache.hadoop.hdfs.ReadStripedFileWithDecodingHelper.NUM_PARITY_UNITS;
Expand Down Expand Up @@ -165,4 +166,21 @@ public void testInvalidateBlock() throws IOException, InterruptedException {
DataNodeTestUtils.setHeartbeatsDisabledForTests(dn, false);
}
}

@Test
public void testMoreThanOneCorruptedBlock() throws IOException {
final Path file = new Path("/corrupted");
final int length = BLOCK_SIZE * NUM_DATA_UNITS;
final byte[] bytes = StripedFileTestUtil.generateBytes(length);
DFSTestUtil.writeFile(dfs, file, bytes);

// read the file with more than one corrupted data block
byte[] buffer = new byte[length + 100];
for (int count = 2; count < NUM_PARITY_UNITS; ++count) {
ReadStripedFileWithDecodingHelper.corruptBlocks(cluster, dfs, file, count, 0,
false);
StripedFileTestUtil.verifyStatefulRead(dfs, file, length, bytes,
buffer);
}
}
}