Class DumpRocksDb

ZezeJava/ZezeJava/src/main/java/Zeze/Util/DumpRocksDb.java:40–506

二者都整理log文件到sst中, 后者还会把0级文件整理合并到1级文件
*/
public final class DumpRocksDb {
	public static void main(String[] args) throws Exception {
		int argCount = args.length;
		for (; argCount > 0; argCount--) {
			var arg = args[argCount - 1];
			if (!arg.startsWith("-") || arg.length() <= 1)
				break;
			int p = arg.indexOf('=', 1);
			if (p >= 0)
				System.setProperty(arg.substring(1, p), arg.substring(p + 1));
			else
				System.setProperty(arg.substring(1), "true");
		}
		if (argCount < 1) {
			System.err.println("usage: java -cp ... " + DumpRocksDb.class.getName() +
					" inputDbPath [[columnFamilyName] outputTxtFile] [options]");
			System.err.println("options: -meta          list database meta data");
			System.err.println("         -compact       compact database files");
			System.err.println("         -compact1      compact level-0 files to level-1");
			System.err.println("         -key=long      decode key as long");
			System.err.println("              string    decode key as string");
			System.err.println("              nstring   decode key as len-prefix string");
			System.err.println("              bean      decode key as bean");
			System.err.println("         -value=bean    decode value as bean");
			System.err.println("                raftLog decode value as raft logs for global server");
			return;
		}
		var inputDbPath = args[0];
		var columnFamilyName = argCount > 2 ? args[1] : null;
		var outputTxtFile = argCount == 1 ? null : argCount == 2 ? args[1] : args[2];
		var columnFamilies = new ArrayList<ColumnFamilyDescriptor>();
		var cfOptions = new ColumnFamilyOptions();
		var dbOptions = new DBOptions();
		for (var cf : RocksDB.listColumnFamilies(new Options(), inputDbPath))
			columnFamilies.add(new ColumnFamilyDescriptor(cf, cfOptions));
		if (columnFamilies.isEmpty())
			columnFamilies.add(new ColumnFamilyDescriptor("default".getBytes(UTF_8), cfOptions));

		if ("true".equalsIgnoreCase(System.getProperty("meta"))) {
			var outHandles = new ArrayList<ColumnFamilyHandle>(columnFamilies.size());
			var levelCount = new int[8];
			var levelSize = new long[8];
			long totalCount = 0, totalSize = 0;
			try (var rocksDb = RocksDB.openReadOnly(dbOptions, inputDbPath, columnFamilies, outHandles)) {
				System.out.println("lvl fileName     size  seqNumMin  seqNumMax reads entry delete columnFamilyName");
				System.out.println("-------------------------------------------------------------------------------");
				var metaList = rocksDb.getLiveFilesMetaData();
				metaList.sort(
						Comparator.comparingInt(LiveFileMetaData::level).thenComparing(SstFileMetaData::fileName));
				for (var meta : metaList) {
					var fileName = meta.fileName();
					if (fileName.startsWith("/"))
						fileName = fileName.substring(1);
					System.out.format("%d %10s%9d %10d %10d %5d %5d %6d %s\n", meta.level(), fileName, meta.size(),
							meta.smallestSeqno(), meta.largestSeqno(), meta.numReadsSampled(), meta.numEntries(),
							meta.numDeletions(), new String(meta.columnFamilyName(), UTF_8));
					levelCount[meta.level()]++;
					levelSize[meta.level()] += meta.size();