/**
* Return an array of scanners corresponding to the given set of store files, And set the
* ScanQueryMatcher for each store file scanner for further optimization
*/
public static List<StoreFileScanner> getScannersForStoreFiles(
Collection<StoreFile> files,
boolean cacheBlocks,
boolean isCompaction,
ScanQueryMatcher matcher)
throws IOException {
List<StoreFileScanner> scanners = new ArrayList<StoreFileScanner>(files.size());
for (StoreFile file : files) {
StoreFile.Reader r = file.createReader();
StoreFileScanner scanner = r.getStoreFileScanner(cacheBlocks, isCompaction);
scanner.setScanQueryMatcher(matcher);
scanners.add(scanner);
}
return scanners;
}
@Override
public Boolean call() throws Exception {
Thread.currentThread().setName("reader " + readerId);
Random rand = new Random();
StoreFileScanner scanner = reader.getStoreFileScanner(true, pread);
while (System.currentTimeMillis() < endTime) {
byte[] row = createRandomRow(rand, firstRow, lastRow);
KeyValue kvToSeek = new KeyValue(row, family, createRandomQualifier(rand));
if (rand.nextDouble() < 0.0001) {
LOG.info("kvToSeek=" + kvToSeek);
}
boolean seekResult;
try {
seekResult = scanner.seek(kvToSeek);
} catch (IOException ex) {
throw new IOException("Seek failed for key " + kvToSeek + ", pread=" + pread, ex);
}
numSeeks.incrementAndGet();
if (!seekResult) {
error("Seek returned false for row " + Bytes.toStringBinary(row));
return false;
}
for (int i = 0; i < rand.nextInt(10) + 1; ++i) {
KeyValue kv = scanner.next();
numKV.incrementAndGet();
if (i == 0 && kv == null) {
error(
"scanner.next() returned null at the first iteration for "
+ "row "
+ Bytes.toStringBinary(row));
return false;
}
if (kv == null) break;
String keyHashStr = MD5Hash.getMD5AsHex(kv.getKey());
keysRead.add(keyHashStr);
totalBytes.addAndGet(kv.getLength());
}
}
return true;
}
public void runMergeWorkload() throws IOException {
long maxKeyCount = prepareForMerge();
List<StoreFileScanner> scanners =
StoreFileScanner.getScannersForStoreFiles(inputStoreFiles, false, false);
HColumnDescriptor columnDescriptor =
new HColumnDescriptor(HFileReadWriteTest.class.getSimpleName());
columnDescriptor.setBlocksize(blockSize);
columnDescriptor.setBloomFilterType(bloomType);
columnDescriptor.setCompressionType(compression);
columnDescriptor.setDataBlockEncoding(dataBlockEncoding);
HRegionInfo regionInfo = new HRegionInfo();
HTableDescriptor htd = new HTableDescriptor(TABLE_NAME);
HRegion region = new HRegion(outputDir, null, fs, conf, regionInfo, htd, null);
HStore store = new HStore(outputDir, region, columnDescriptor, fs, conf);
StoreFile.Writer writer =
new StoreFile.WriterBuilder(conf, new CacheConfig(conf), fs, blockSize)
.withOutputDir(outputDir)
.withCompression(compression)
.withDataBlockEncoder(dataBlockEncoder)
.withBloomType(bloomType)
.withMaxKeyCount(maxKeyCount)
.withChecksumType(HFile.DEFAULT_CHECKSUM_TYPE)
.withBytesPerChecksum(HFile.DEFAULT_BYTES_PER_CHECKSUM)
.build();
StatisticsPrinter statsPrinter = new StatisticsPrinter();
statsPrinter.startThread();
try {
performMerge(scanners, store, writer);
writer.close();
} finally {
statsPrinter.requestStop();
}
Path resultPath = writer.getPath();
resultPath = tryUsingSimpleOutputPath(resultPath);
long fileSize = fs.getFileStatus(resultPath).getLen();
LOG.info("Created " + resultPath + ", size " + fileSize);
System.out.println();
System.out.println("HFile information for " + resultPath);
System.out.println();
HFilePrettyPrinter hfpp = new HFilePrettyPrinter();
hfpp.run(new String[] {"-m", "-f", resultPath.toString()});
}
/**
* Creates file scanners for compaction.
*
* @param filesToCompact Files.
* @return Scanners.
*/
protected List<StoreFileScanner> createFileScanners(
final Collection<StoreFile> filesToCompact, long smallestReadPoint) throws IOException {
return StoreFileScanner.getScannersForStoreFiles(
filesToCompact, false, false, true, smallestReadPoint);
}
/**
* Do a minor/major compaction on an explicit set of storefiles from a Store.
*
* @param request the requested compaction that contains all necessary information to complete the
* compaction (i.e. the store, the files, etc.)
* @return Product of compaction or null if all cells expired or deleted and nothing made it
* through the compaction.
* @throws IOException
*/
StoreFile.Writer compact(CompactionRequest request, long maxId) throws IOException {
// Calculate maximum key count after compaction (for blooms)
// Also calculate earliest put timestamp if major compaction
int maxKeyCount = 0;
long earliestPutTs = HConstants.LATEST_TIMESTAMP;
long maxMVCCReadpoint = 0;
// pull out the interesting things from the CR for ease later
final Store store = request.getStore();
final boolean majorCompaction = request.isMajor();
final List<StoreFile> filesToCompact = request.getFiles();
for (StoreFile file : filesToCompact) {
StoreFile.Reader r = file.getReader();
if (r == null) {
LOG.warn("Null reader for " + file.getPath());
continue;
}
// NOTE: getFilterEntries could cause under-sized blooms if the user
// switches bloom type (e.g. from ROW to ROWCOL)
long keyCount =
(r.getBloomFilterType() == store.getFamily().getBloomFilterType())
? r.getFilterEntries()
: r.getEntries();
maxKeyCount += keyCount;
// Calculate the maximum MVCC readpoint used in any of the involved files
Map<byte[], byte[]> fileInfo = r.loadFileInfo();
byte[] tmp = fileInfo.get(HFileWriterV2.MAX_MEMSTORE_TS_KEY);
if (tmp != null) {
maxMVCCReadpoint = Math.max(maxMVCCReadpoint, Bytes.toLong(tmp));
}
// For major compactions calculate the earliest put timestamp
// of all involved storefiles. This is used to remove
// family delete marker during the compaction.
if (majorCompaction) {
tmp = fileInfo.get(StoreFile.EARLIEST_PUT_TS);
if (tmp == null) {
// There's a file with no information, must be an old one
// assume we have very old puts
earliestPutTs = HConstants.OLDEST_TIMESTAMP;
} else {
earliestPutTs = Math.min(earliestPutTs, Bytes.toLong(tmp));
}
}
if (LOG.isDebugEnabled()) {
LOG.debug(
"Compacting "
+ file
+ ", keycount="
+ keyCount
+ ", bloomtype="
+ r.getBloomFilterType().toString()
+ ", size="
+ StringUtils.humanReadableInt(r.length())
+ ", encoding="
+ r.getHFileReader().getEncodingOnDisk()
+ (majorCompaction ? ", earliestPutTs=" + earliestPutTs : ""));
}
}
// keep track of compaction progress
this.progress = new CompactionProgress(maxKeyCount);
// Get some configs
int compactionKVMax = getConf().getInt("hbase.hstore.compaction.kv.max", 10);
Compression.Algorithm compression = store.getFamily().getCompression();
// Avoid overriding compression setting for major compactions if the user
// has not specified it separately
Compression.Algorithm compactionCompression =
(store.getFamily().getCompactionCompression() != Compression.Algorithm.NONE)
? store.getFamily().getCompactionCompression()
: compression;
// For each file, obtain a scanner:
List<StoreFileScanner> scanners =
StoreFileScanner.getScannersForStoreFiles(filesToCompact, false, false, true);
// Make the instantiation lazy in case compaction produces no product; i.e.
// where all source cells are expired or deleted.
StoreFile.Writer writer = null;
// Find the smallest read point across all the Scanners.
long smallestReadPoint = store.getHRegion().getSmallestReadPoint();
MultiVersionConsistencyControl.setThreadReadPoint(smallestReadPoint);
try {
InternalScanner scanner = null;
try {
if (store.getHRegion().getCoprocessorHost() != null) {
scanner =
store
.getHRegion()
.getCoprocessorHost()
.preCompactScannerOpen(
store,
scanners,
majorCompaction ? ScanType.MAJOR_COMPACT : ScanType.MINOR_COMPACT,
earliestPutTs,
request);
}
if (scanner == null) {
Scan scan = new Scan();
scan.setMaxVersions(store.getFamily().getMaxVersions());
/* Include deletes, unless we are doing a major compaction */
scanner =
new StoreScanner(
store,
store.getScanInfo(),
scan,
scanners,
majorCompaction ? ScanType.MAJOR_COMPACT : ScanType.MINOR_COMPACT,
smallestReadPoint,
earliestPutTs);
}
if (store.getHRegion().getCoprocessorHost() != null) {
InternalScanner cpScanner =
store.getHRegion().getCoprocessorHost().preCompact(store, scanner, request);
// NULL scanner returned from coprocessor hooks means skip normal processing
if (cpScanner == null) {
return null;
}
scanner = cpScanner;
}
int bytesWritten = 0;
// since scanner.next() can return 'false' but still be delivering data,
// we have to use a do/while loop.
List<KeyValue> kvs = new ArrayList<KeyValue>();
// Limit to "hbase.hstore.compaction.kv.max" (default 10) to avoid OOME
boolean hasMore;
do {
hasMore = scanner.next(kvs, compactionKVMax);
if (writer == null && !kvs.isEmpty()) {
writer =
store.createWriterInTmp(
maxKeyCount,
compactionCompression,
true,
maxMVCCReadpoint >= smallestReadPoint);
}
if (writer != null) {
// output to writer:
for (KeyValue kv : kvs) {
if (kv.getMemstoreTS() <= smallestReadPoint) {
kv.setMemstoreTS(0);
}
writer.append(kv);
// update progress per key
++progress.currentCompactedKVs;
// check periodically to see if a system stop is requested
if (Store.closeCheckInterval > 0) {
bytesWritten += kv.getLength();
if (bytesWritten > Store.closeCheckInterval) {
bytesWritten = 0;
isInterrupted(store, writer);
}
}
}
}
kvs.clear();
} while (hasMore);
} finally {
if (scanner != null) {
scanner.close();
}
}
} finally {
if (writer != null) {
writer.appendMetadata(maxId, majorCompaction);
writer.close();
}
}
return writer;
}
