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https://issues.apache.org/jira/browse/HBASE-28482?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17841838#comment-17841838
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Hudson commented on HBASE-28482:
--------------------------------
Results for branch branch-2.4
[build #727 on
builds.a.o|https://ci-hbase.apache.org/job/HBase%20Nightly/job/branch-2.4/727/]:
(x) *{color:red}-1 overall{color}*
----
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(/) {color:green}+1 general checks{color}
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(/) {color:green}+1 source release artifact{color}
-- See build output for details.
(/) {color:green}+1 client integration test{color}
> Reverse scan with tags throws ArrayIndexOutOfBoundsException with DBE
> ---------------------------------------------------------------------
>
> Key: HBASE-28482
> URL: https://issues.apache.org/jira/browse/HBASE-28482
> Project: HBase
> Issue Type: Bug
> Components: HFile
> Reporter: Vineet Kumar Maheshwari
> Assignee: Vineet Kumar Maheshwari
> Priority: Major
> Labels: pull-request-available
> Fix For: 2.6.0, 2.4.18, 3.0.0-beta-2, 2.5.9
>
>
> Facing ArrayIndexOutOfBoundsException when performing reverse scan on a table
> with 30K+ records in single hfile.
> Exception is happening when block changes during seekBefore call.
> {code:java}
> Caused by: java.lang.ArrayIndexOutOfBoundsException
> at
> org.apache.hadoop.hbase.util.ByteBufferUtils.copyFromBufferToArray(ByteBufferUtils.java:1326)
> at org.apache.hadoop.hbase.nio.SingleByteBuff.get(SingleByteBuff.java:213)
> at
> org.apache.hadoop.hbase.io.encoding.DiffKeyDeltaEncoder$DiffSeekerStateBufferedEncodedSeeker.decode(DiffKeyDeltaEncoder.java:431)
> at
> org.apache.hadoop.hbase.io.encoding.DiffKeyDeltaEncoder$DiffSeekerStateBufferedEncodedSeeker.decodeNext(DiffKeyDeltaEncoder.java:502)
> at
> org.apache.hadoop.hbase.io.encoding.BufferedDataBlockEncoder$BufferedEncodedSeeker.seekToKeyInBlock(BufferedDataBlockEncoder.java:1012)
> at
> org.apache.hadoop.hbase.io.hfile.HFileReaderImpl$EncodedScanner.loadBlockAndSeekToKey(HFileReaderImpl.java:1605)
> at
> org.apache.hadoop.hbase.io.hfile.HFileReaderImpl$HFileScannerImpl.seekBefore(HFileReaderImpl.java:719)
> at
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.seekBeforeAndSaveKeyToPreviousRow(StoreFileScanner.java:645)
> at
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.seekToPreviousRowWithoutHint(StoreFileScanner.java:570)
> at
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.seekToPreviousRow(StoreFileScanner.java:506)
> at
> org.apache.hadoop.hbase.regionserver.ReversedKeyValueHeap.next(ReversedKeyValueHeap.java:126)
> at
> org.apache.hadoop.hbase.regionserver.StoreScanner.next(StoreScanner.java:693)
> at
> org.apache.hadoop.hbase.regionserver.KeyValueHeap.next(KeyValueHeap.java:151){code}
>
> Steps to reproduce:
> Create a table with DataBlockEncoding.DIFF and block size as 1024, write some
> 30K+ puts with setTTL, then do a reverse scan.
> {code:java}
> @Test
> public void testReverseScanWithDBEWhenCurrentBlockUpdates() throws
> IOException {
> byte[] family = Bytes.toBytes("0");
> Configuration conf = new Configuration(TEST_UTIL.getConfiguration());
> conf.setInt(HConstants.HBASE_CLIENT_RETRIES_NUMBER, 1);
> try (Connection connection = ConnectionFactory.createConnection(conf)) {
> testReverseScanWithDBE(connection, DataBlockEncoding.DIFF, family, 1024,
> 30000);
> for (DataBlockEncoding encoding : DataBlockEncoding.values()) {
> testReverseScanWithDBE(connection, encoding, family, 1024, 30000);
> }
> }
> }
> private void testReverseScanWithDBE(Connection conn, DataBlockEncoding
> encoding, byte[] family, int blockSize, int maxRows)
> throws IOException {
> LOG.info("Running test with DBE={}", encoding);
> TableName tableName = TableName.valueOf(TEST_NAME.getMethodName() + "-" +
> encoding);
> TEST_UTIL.createTable(TableDescriptorBuilder.newBuilder(tableName)
> .setColumnFamily(
> ColumnFamilyDescriptorBuilder.newBuilder(family).setDataBlockEncoding(encoding).setBlocksize(blockSize).build())
> .build(), null);
> Table table = conn.getTable(tableName);
> byte[] val1 = new byte[10];
> byte[] val2 = new byte[10];
> Bytes.random(val1);
> Bytes.random(val2);
> for (int i = 0; i < maxRows; i++) {
> table.put(new Put(Bytes.toBytes(i)).addColumn(family, Bytes.toBytes(1), val1)
> .addColumn(family, Bytes.toBytes(2), val2).setTTL(600_000));
> }
> TEST_UTIL.flush(table.getName());
> Scan scan = new Scan();
> scan.setReversed(true);
> try (ResultScanner scanner = table.getScanner(scan)) {
> for (int i = maxRows - 1; i >= 0; i--) {
> Result row = scanner.next();
> assertEquals(2, row.size());
> Cell cell1 = row.getColumnLatestCell(family, Bytes.toBytes(1));
> assertTrue(CellUtil.matchingRows(cell1, Bytes.toBytes(i)));
> assertTrue(CellUtil.matchingValue(cell1, val1));
> Cell cell2 = row.getColumnLatestCell(family, Bytes.toBytes(2));
> assertTrue(CellUtil.matchingRows(cell2, Bytes.toBytes(i)));
> assertTrue(CellUtil.matchingValue(cell2, val2));
> }
> }
> }
> {code}
>
> HBASE-27580 has fixed the issue for seekBefore in rewind function flow, but
> similar change is required in setCurrentBlock function flow also.
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