Victor Xu created HBASE-15085:
---------------------------------
Summary: IllegalStateException was thrown when scanning on
bulkloaded HFiles
Key: HBASE-15085
URL: https://issues.apache.org/jira/browse/HBASE-15085
Project: HBase
Issue Type: Bug
Affects Versions: 1.1.2, 0.98.12
Environment: HBase-0.98.12 & Hadoop-2.6.0 & JDK1.7
HBase-1.1.2 & Hadoop-2.6.0 & JDK1.7
Reporter: Victor Xu
Assignee: Victor Xu
IllegalStateException was thrown when we scanned from an HFile which was bulk
loaded several minutes ago, as shown below:
{code}
2015-12-16 22:20:54,456 ERROR
com.taobao.kart.coprocessor.server.KartCoprocessor:
icbu_ae_ws_product,/0055,1450275490479.6a6a700f465ad074287fed720c950f7c.
batchNotify exception
java.lang.IllegalStateException: EncodedScanner works only on encoded data
blocks
at
org.apache.hadoop.hbase.io.hfile.HFileReaderV2$EncodedScannerV2.updateCurrentBlock(HFileReaderV2.java:1042)
at
org.apache.hadoop.hbase.io.hfile.HFileReaderV2$EncodedScannerV2.seekTo(HFileReaderV2.java:1093)
at
org.apache.hadoop.hbase.regionserver.StoreFileScanner.seekAtOrAfter(StoreFileScanner.java:244)
at
org.apache.hadoop.hbase.regionserver.StoreFileScanner.seek(StoreFileScanner.java:152)
at
org.apache.hadoop.hbase.regionserver.StoreScanner.seekScanners(StoreScanner.java:329)
at
org.apache.hadoop.hbase.regionserver.StoreScanner.<init>(StoreScanner.java:188)
at
org.apache.hadoop.hbase.regionserver.HStore.getScanner(HStore.java:1879)
at
org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.<init>(HRegion.java:4068)
at
org.apache.hadoop.hbase.regionserver.HRegion.instantiateRegionScanner(HRegion.java:2029)
at
org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:2015)
at
org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:1992)
{code}
I used 'hbase hfile' command to analyse the meta and block info of the hfile,
finding that even through the DATA_BLOCK_ENCODING was 'DIFF' in FileInfo, the
actual data blocks was written without any encoding algorithms(BlockType was
'DATA', not 'ENCODED_DATA'):
{code}
Fileinfo:
BLOOM_FILTER_TYPE = ROW
BULKLOAD_SOURCE_TASK = attempt_1442077249005_606706_r_000012_0
BULKLOAD_TIMESTAMP = \x00\x00\x01R\x12$\x13\x12
DATA_BLOCK_ENCODING = DIFF
...
DataBlock Header:
HFileBlock [ fileOffset=0 headerSize()=33 blockType=DATA
onDiskSizeWithoutHeader=65591 uncompressedSizeWithoutHeader=65571
prevBlockOffset=-1 isUseHBaseChecksum()=true checksumType=CRC32
bytesPerChecksum=16384 onDiskDataSizeWithHeader=65604
getOnDiskSizeWithHeader()=65624 totalChecksumBytes()=20 isUnpacked()=true buf=[
java.nio.HeapByteBuffer[pos=0 lim=65624 cap=65657], array().length=65657,
arrayOffset()=0 ]
dataBeginsWith=\x00\x00\x003\x00\x00\x00\x0A\x00\x10/0008:1000000008\x01dprod
fileContext=HFileContext [ usesHBaseChecksum=true checksumType=CRC32
bytesPerChecksum=16384 blocksize=65536 encoding=NONE includesMvcc=true
includesTags=false compressAlgo=NONE compressTags=false cryptoContext=[
cipher=NONE keyHash=NONE ] ] ]
{code}
The data block encoding in file info was not consistent with the one in data
block, which means there must be something wrong with the bulkload process.
After debugging on each step of bulkload, I found that LoadIncrementalHFiles
had a bug when loading hfile into a splitted region.
{code}
/**
* Copy half of an HFile into a new HFile.
*/
private static void copyHFileHalf(
Configuration conf, Path inFile, Path outFile, Reference reference,
HColumnDescriptor familyDescriptor)
throws IOException {
FileSystem fs = inFile.getFileSystem(conf);
CacheConfig cacheConf = new CacheConfig(conf);
HalfStoreFileReader halfReader = null;
StoreFile.Writer halfWriter = null;
try {
halfReader = new HalfStoreFileReader(fs, inFile, cacheConf, reference,
conf);
Map<byte[], byte[]> fileInfo = halfReader.loadFileInfo();
int blocksize = familyDescriptor.getBlocksize();
Algorithm compression = familyDescriptor.getCompression();
BloomType bloomFilterType = familyDescriptor.getBloomFilterType();
// use CF's DATA_BLOCK_ENCODING to initialize HFile writer
HFileContext hFileContext = new HFileContextBuilder()
.withCompression(compression)
.withChecksumType(HStore.getChecksumType(conf))
.withBytesPerCheckSum(HStore.getBytesPerChecksum(conf))
.withBlockSize(blocksize)
.withDataBlockEncoding(familyDescriptor.getDataBlockEncoding())
.build();
halfWriter = new StoreFile.WriterBuilder(conf, cacheConf,
fs)
.withFilePath(outFile)
.withBloomType(bloomFilterType)
.withFileContext(hFileContext)
.build();
HFileScanner scanner = halfReader.getScanner(false, false, false);
scanner.seekTo();
do {
KeyValue kv = KeyValueUtil.ensureKeyValue(scanner.getKeyValue());
halfWriter.append(kv);
} while (scanner.next());
// force encoding setting with the original HFile's file info
for (Map.Entry<byte[],byte[]> entry : fileInfo.entrySet()) {
if (shouldCopyHFileMetaKey(entry.getKey())) {
halfWriter.appendFileInfo(entry.getKey(), entry.getValue());
}
}
} finally {
if (halfWriter != null) halfWriter.close();
if (halfReader != null) halfReader.close(cacheConf.shouldEvictOnClose());
}
}
{code}
As shown above, when an HFile which has a DIFF encoding is bulkloaded into a
splitted region whose CF's DATA_BLOCK_ENCODING is NONE, the two new HFiles
would have inconsistent encodings.
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