{"id":163,"date":"2017-07-17T23:43:03","date_gmt":"2017-07-17T15:43:03","guid":{"rendered":"http:\/\/www.myway5.com\/?p=163"},"modified":"2023-07-05T22:00:53","modified_gmt":"2023-07-05T14:00:53","slug":"leveldb-log-table","status":"publish","type":"post","link":"https:\/\/www.myway5.com\/index.php\/2017\/07\/17\/leveldb-log-table\/","title":{"rendered":"leveldb\u6587\u6863\u7ffb\u8bd1(3)-leveldb\u7684\u65e5\u5fd7\u683c\u5f0f\u548c\u8868\u683c\u5f0f"},"content":{"rendered":"

\u65e5\u5fd7\u6587\u4ef6\u7684\u683c\u5f0f<\/h2>\n

\u65e5\u5fd7\u6587\u4ef6\u7684\u5185\u5bb9\u662f\u4e00\u4e2a32KB\u5927\u5c0f\u7684\u5757\u7684\u5e8f\u5217\u3002\u552f\u4e00\u53ef\u80fd\u7684\u610f\u5916\u662f\u65e5\u5fd7\u6587\u4ef6\u7ed3\u5c3e\u53ef\u80fd\u5305\u542b\u4e00\u4e2a\u4e0d\u5b8c\u6574\u7684\u5757\u3002<\/p>\n

\u6bcf\u4e00\u4e2a\u5757\u7531\u4ee5\u4e0b\u8bb0\u5f55\u7ec4\u6210<\/p>\n

block := record* trailer?\nrecord :=\n  checksum: uint32     \/\/ crc32c of type and data[] ; little-endian\n  length: uint16       \/\/ little-endian\n  type: uint8          \/\/ One of FULL, FIRST, MIDDLE, LAST\n  data: uint8[length]\n<\/code><\/pre>\n
\uff08\u6ce8\uff1acrc32c\u662f\u4e00\u79cd\u68c0\u9a8c\u7b97\u6cd5\uff09<\/p>\n
\u4e00\u6761\u8bb0\u5f55\u7edd\u4e0d\u4f1a\u5728\u5757\u7684\u6700\u540e6\u4e2a\u5b57\u8282\u5185\u5f00\u59cb\uff08\u56e0\u4e3a\u5269\u4e0b\u76846\u4e2a\u5b57\u8282\u5df2\u7ecf\u4e0d\u591f\u5927\uff0cchecksum,length,type\u603b\u5171\u9700\u89817\u4e2a\u5b57\u8282\uff09\u3002\u4efb\u4f55\u7559\u4e0b\u7684\u5b57\u8282\u5f62\u6210trailer(\u62d6\u8f66?),\u8fd9\u90e8\u5206\u5fc5\u987b\u5b8c\u5168\u662f0\u5b57\u8282\uff0c\u8bfb\u53d6\u7684\u65f6\u5019\u5fc5\u987b\u8df3\u8fc7\u3002<\/p>\n
\u6ce8\uff1a\u5982\u679c\u5f53\u524d\u5757\u6070\u597d\u67097\u4e2a\u5b57\u8282\u7559\u4e0b\u6765\uff0c\u4e00\u4e2a\u65b0\u7684\u975e0\u957f\u5ea6\u7684\u8bb0\u5f55\u88ab\u589e\u52a0\uff0c\u5199\u5165\u5fc5\u987b\u7528\u4e00\u4e2aFIRST\u8bb0\u5f55\uff08\u5305\u542b0\u5b57\u8282\u7684\u7528\u6237\u6570\u636e\uff0cFIRST\u7528\u6765\u8868\u793a\u8fd9\u662f\u4e00\u6761\u8bb0\u5f55\u7684\u5f00\u59cb\u90e8\u5206\uff09\u53bb\u586b\u5145\u5757\u7684\u6700\u540e7\u4e2a\u5b57\u8282\uff0c\u4e4b\u540e\u5c06\u6240\u6709\u7684\u7528\u6237\u6570\u636e\u5199\u5728\u540e\u6765\u7684\u5757\u4e2d\u3002<\/p>\n
\u66f4\u591a\u7684\u7c7b\u578b\u53ef\u80fd\u5728\u4ee5\u540e\u4f1a\u52a0\u5165\u8fdb\u6765\u3002\u4e00\u4e9b\u8bfb\u53d6\u7a0b\u5e8f\u53ef\u80fd\u4f1a\u8df3\u8fc7\u5b83\u4eec\u4e0d\u8ba4\u8bc6\u7684\u8bb0\u5f55\u7c7b\u578b\uff0c\u5176\u4ed6\u8bfb\u53d6\u7a0b\u5e8f\u53ef\u80fd\u4f1a\u62a5\u544a\u6709\u4e9b\u6570\u636e\u88ab\u8df3\u8fc7\u4e86\u3002<\/p>\n
FULL == 1\nFIRST == 2\nMIDDLE == 3\nLAST == 4\n<\/code><\/pre>\n
FULL\u8bb0\u5f55\u5305\u542b\u4e00\u4e2a\u5b8c\u6574\u7684\u7528\u6237\u8bb0\u5f55\u7684\u5185\u5bb9<\/p>\n
FIRST\uff0cMIDDLE\uff0cLAST\u662f\u7528\u6765\u8868\u793a\u7528\u6237\u8bb0\u5f55\u88ab\u5206\u6210\u591a\u4e2a\u7247\u6bb5\uff08\u5c24\u5176\u662f\u5757\u7684\u8fb9\u754c\uff09\u3002FIRST\u662f\u7528\u6237\u8bb0\u5f55\u7684\u7b2c\u4e00\u4e2a\u7247\u6bb5\uff0cLAST\u662f\u7528\u6237\u8bb0\u5f55\u7684\u6700\u540e\u4e00\u4e2a\u7247\u6bb5\uff0cMIDDLE\u662f\u6240\u6709\u7528\u6237\u6570\u636e\u7684\u5185\u90e8\u7247\u6bb5\u3002<\/p>\n
\u4f8b\u5982:\u6709\u4ee5\u4e0b\u7684\u7528\u6237\u6570\u636e<\/p>\n
A: length 1000\nB: length 97270\nC: length 8000\n<\/code><\/pre>\n
A<\/strong>\u5c06\u4f1a\u5728\u7b2c\u4e00\u5757\u4e2d\u5b58\u50a8\u4e3aFULL\u8bb0\u5f55\u3002<\/p>\n
B<\/strong>\u5c06\u4f1a\u5212\u5206\u62103\u6bb5\uff1a\u7b2c\u4e00\u6bb5\u5360\u7528\u7b2c\u4e00\u5757\u5269\u4e0b\u7684\u90e8\u5206\uff0c\u7b2c\u4e8c\u6bb5\u5360\u7528\u6574\u4e2a\u7b2c\u4e8c\u5757\uff0c\u7b2c\u4e09\u6bb5\u5360\u7528\u7b2c\u4e09\u5757\u7684\u524d\u9762\u90e8\u5206\u3002\u8fd9\u5c06\u4f1a\u5728\u7b2c\u4e09\u5757\u4e2d\u7559\u4e0b6\u4e2a\u5b57\u8282\u7684\u7a7a\u95f4\uff0c\u88ab\u7559\u4f5c\u7a7a\u767d\u5f53\u6210trailer\u3002<\/p>\n
C<\/strong>\u5c06\u4f1a\u5728\u7b2c\u56db\u5757\u4e2d\u5b58\u50a8\u4e3a\u4e00\u4e2aFULL\u8bb0\u5f55\u3002<\/p>\n
\u8fd9\u79cd\u8bb0\u5f55\u683c\u5f0f\u7684\u4f18\u70b9<\/h3>\n
1.\u6211\u4eec\u4e0d\u9700\u8981\u4efb\u4f55\u7684\u540c\u6b65\u7684\u542f\u53d1\u5f0f\u7b97\u6cd5-\u76f4\u63a5\u8df3\u5230\u4e0b\u4e00\u4e2a\u5757\u7684\u8fb9\u754c\u5e76\u4e14\u626b\u63cf\u3002\u5982\u679c\u6709\u4e00\u4e2a\u9519\u8bef\u53d1\u751f\uff0c\u8df3\u5230\u4e0b\u4e00\u5757\u3002\u4f5c\u4e3a\u4e00\u4e2a\u8fb9\u754c\u6548\u76ca\uff0c\u5f53\u4e00\u4e2a\u65e5\u5fd7\u6587\u4ef6\u7684\u5185\u5bb9\u7684\u4e00\u90e8\u5206\u88ab\u4f5c\u4e3a\u4e00\u4e2a\u8bb0\u5f55\u5d4c\u5165\u5230\u53e6\u5916\u4e00\u4e2a\u65e5\u5fd7\u6587\u4ef6\u4e2d\uff0c\u6211\u4eec\u4e0d\u4f1a\u53d8\u7684\u56f0\u60d1\u3002<\/p>\n
2.\u5728\u8fd1\u4f3c\u8fb9\u754c\u4e0a\u5206\u5272\uff08\u6bd4\u5982mapreduce\uff09\u662f\u7b80\u5355\u7684\uff1a\u627e\u5230\u4e0b\u4e00\u4e2a\u5757\u7684\u8fb9\u754c\uff0c\u8df3\u8fc7\u8bb0\u5f55\u76f4\u5230\u6211\u4eec\u9047\u5230\u4e00\u4e2aFULL\u6216FIRST\u8bb0\u5f55\u3002<\/p>\n
3.\u5bf9\u4e8e\u5927\u7684\u8bb0\u5f55\u6211\u4eec\u4e0d\u9700\u8981\u989d\u5916\u7684\u7f13\u51b2\u533a\u3002<\/p>\n
\u5bf9\u6bd4\u8fd9\u4e2a\u8bb0\u5f55\u683c\u5f0f\u7684\u7f3a\u70b9<\/h3>\n
1.\u6ca1\u6709\u5bf9\u5fae\u5c0f\u7684\u8bb0\u5f55\u7684\u5305\u88c5\u3002\u8fd9\u53ef\u80fd\u901a\u8fc7\u6dfb\u52a0\u65b0\u7684\u8bb0\u5f55\u7c7b\u578b\u6765\u4fee\u590d\uff0c\u56e0\u6b64\u5b83\u53ea\u662f\u5f53\u524d\u5b9e\u73b0\u7684\u77ed\u5904\uff0c\u4e0d\u662f\u8fd9\u79cd\u683c\u5f0f\u7684\u5fc5\u987b\u3002<\/p>\n
2.\u6ca1\u6709\u538b\u7f29\u3002\u540c\u6837\u7684\uff0c\u8fd9\u4e5f\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u65b0\u7684\u8bb0\u5f55\u683c\u5f0f\u6765\u4fee\u590d\u3002<\/p>\n
\u8868\u6587\u4ef6\u7684\u683c\u5f0f<\/h2>\n
<beginning_of_file>\n[data block 1]\n[data block 2]\n...\n[data block N]\n[meta block 1]\n...\n[meta block K]\n[metaindex block]\n[index block]\n[Footer]        (fixed size; starts at file_size - sizeof(Footer))\n<end_of_file>\n<\/code><\/pre>\n
\u8fd9\u4e2a\u6587\u4ef6\u5305\u542b\u5185\u90e8\u7684\u6307\u9488\u3002\u6bcf\u4e00\u4e2a\u6307\u9488\u90fd\u88ab\u79f0\u4f5cBlockHandle\uff0c\u5305\u542b\u4e0b\u9762\u7684\u4fe1\u606f\uff1a<\/p>\n
offset:   varint64\nsize:     varint64\n<\/code><\/pre>\n
\u53c2\u8003varints<\/a>,\u91cc\u9762\u6709varint64\u683c\u5f0f\u7684\u89e3\u91ca\u3002<\/p>\n
1.\u952e\u503c\u5bf9\u5e8f\u5217\u662f\u6709\u5e8f\u5b58\u50a8\u7684\uff0c\u88ab\u5206\u6210\u591a\u4e2a\u6570\u636e\u5757\u3002\u8fd9\u4e9b\u6570\u636e\u5757\u4ece\u6587\u4ef6\u5f00\u5934\u4e00\u4e2a\u63a5\u7740\u4e00\u4e2a\u3002\u6bcf\u4e00\u4e2a\u6570\u636e\u5757\u88abblock_builder.cc<\/code>\u4e2d\u7684\u4ee3\u7801\u683c\u5f0f\u5316\uff0c\u4e4b\u540e\u6709\u9009\u62e9\u7684\u8fdb\u884c\u538b\u7f29\u3002<\/p>\n
2.\u5728\u6570\u636e\u5757\u4e4b\u540e\u6211\u4eec\u5b58\u50a8\u4e00\u675f\u5143\u5757\u3002\u652f\u6301\u7684\u5143\u5757\u7c7b\u578b\u5728\u4e0b\u9762\u63cf\u8ff0\u4e86\u3002\u66f4\u591a\u7684\u5143\u5757\u7c7b\u578b\u53ef\u80fd\u5728\u4ee5\u540e\u4f1a\u52a0\u8fdb\u6765\u3002\u6bcf\u4e00\u4e2a\u5143\u5757\u7c7b\u578b\u4e5f\u662f\u7528block_builder.cc<\/code>\u683c\u5f0f\u5316\uff0c\u7136\u540e\u4e4b\u540e\u88ab\u6709\u9009\u62e9\u7684\u538b\u7f29\u3002<\/p>\n
3.\u4e00\u4e2a\u201c\u5143\u7d22\u5f15\u201d\u5757\u3002\u5b83\u5305\u542b\u6bcf\u4e00\u4e2a\u5176\u4ed6\u7684\u5143\u5757\u7684\u5165\u53e3\uff0c\u5165\u53e3\u7684\u952e\u662f\u8fd9\u4e2a\u5143\u5757\u7684\u540d\u5b57\uff0c\u503c\u662f\u4e00\u4e2aBlockHandle\u6307\u5411\u5143\u5757\u3002<\/p>\n
4.\u4e00\u4e2a\u201c\u7d22\u5f15\u201d\u5757\u3002\u8fd9\u4e2a\u5757\u5305\u542b\u6bcf\u4e2a\u6570\u636e\u5757\u7684\u5165\u53e3\uff0c\u952e\u662f\u4e00\u4e2a\u5927\u4e8e\u7b49\u4e8e\u5f53\u524d\u6570\u636e\u5757\u7684\u6700\u540e\u4e00\u4e2a\u952e\u7684\u5b57\u7b26\u4e32\uff0c\u5728\u8fde\u7eed\u7684\u6570\u636e\u5757\u7684\u7b2c\u4e00\u4e2a\u952e\u4e4b\u524d\u3002\u503c\u662f\u8fd9\u4e2a\u6570\u636e\u5757\u7684BlockHandle\u3002<\/p>\n
5.\u5728\u6587\u4ef6\u7684\u6700\u540e\u9762\u662f\u4e00\u4e2a\u586b\u5145\u6ee1\u957f\u5ea6\u7684\u811a\u90e8\uff0c\u5305\u542b\u4e86\u5143\u7d22\u5f15\u5757\u548c\u7d22\u5f15\u5757\u7684BlockHandle\uff0c\u8fd8\u6709\u4e00\u4e2a\u9b54\u672f\u6570\u5b57\u3002<\/p>\n
    metaindex_handle: char[p];     \/\/ Block handle for metaindex\n    index_handle:     char[q];     \/\/ Block handle for index\n    padding:          char[40-p-q];\/\/ zeroed bytes to make fixed length\n                                   \/\/ (40==2*BlockHandle::kMaxEncodedLength)\n    magic:            fixed64;     \/\/ == 0xdb4775248b80fb57 (little-endian)\n<\/code><\/pre>\n
\u201cfilter\u201d\u5143\u5757<\/h3>\n
\u5728\u6570\u636e\u5e93\u6253\u5f00\u65f6\u5982\u679c FilterPolicy<\/code>\u88ab\u6307\u5b9a\uff0c\u6bcf\u4e2a\u8868\u90fd\u4f1a\u6709\u4e00\u4e2afilter\u5757\u3002\u201c\u5143\u7d22\u5f15\u201d\u5757\u5305\u542b\u4e00\u4e2a\u5165\u53e3\uff0c\u5c06filter.<N><\/code>\u6307\u5411\u4e86 BlockHandle\uff0c\u5bf9\u4e8efilter\u5757\uff0c<N><\/code>\u662ffilter \u7b56\u7565\u7684
\nName()<\/code> \u65b9\u6cd5\u8fd4\u56de\u7684\u3002<\/p>\n
filter\u5757\u5b58\u50a8\u4e86\u4e00\u7cfb\u5217\u7684filters\uff0cfilter i\u5305\u542b\u4e86FilterPolicy::CreateFilter()<\/code>\u5728\u6240\u6709\u5b58\u50a8\u5728\u6587\u4ef6\u504f\u79fb\u843d\u5165\u5230\u8303\u56f4[ ibase … (i+1)<\/em>base-1 ]\u7684\u5757\u4e2d\u952e\u7684\u8f93\u51fa\u3002<\/p>\n
\u5f53\u524d\uff0c”base”\u662f2KB\uff0c\u5bf9\u8fd9\u4e2a\u4f8b\u5b50\u6765\u8bf4\uff0c\u5982\u679c\u5757X\u548cY\u5f00\u59cb\u5728\u8303\u56f4 [ 0KB .. 2KB-1 ]<\/code>,\u6240\u6709\u7684\u5728X\u548cY\u4e4b\u95f4\u7684\u952e\u5c06\u4f1a\u901a\u8fc7\u8c03\u7528FilterPolicy::CreateFilter()<\/code>\u88ab\u8f6c\u6362\u6210\u4e00\u4e2afilter\uff0c\u5f97\u5230\u7684filter\u5c06\u4f1a\u88ab\u5b58\u50a8\u6210\u5f53\u524dfilter\u5757\u7684\u7b2c\u4e00\u4e2afilter\u3002<\/p>\n
filter block\u662f\u4ee5\u4e0b\u683c\u5f0f\u7684\uff1a<\/p>\n
[filter 0]\n[filter 1]\n[filter 2]\n...\n[filter N-1]\n\n[offset of filter 0]                  : 4 bytes\n[offset of filter 1]                  : 4 bytes\n[offset of filter 2]                  : 4 bytes\n...\n[offset of filter N-1]                : 4 bytes\n\n[offset of beginning of offset array] : 4 bytes\nlg(base)                              : 1 byte\n<\/code><\/pre>\n
filter\u5757\u7684\u6700\u540e\u7684\u504f\u79fb\u6570\u7ec4\u5141\u8bb8\u9ad8\u6548\u5730mapping\u4e00\u4e2a\u6570\u636e\u5757\u504f\u79fb\u5230\u76f8\u5e94\u7684filter\u3002<\/p>\n
“\u7edf\u8ba1”\u5143\u5757<\/h2>\n
\u8fd9\u4e2a\u5143\u5757\u5305\u542b\u4e00\u675f\u7edf\u8ba1\u3002\u952e\u662f\u7edf\u8ba1\u9879\u7684\u540d\u5b57\u3002\u503c\u5305\u542b\u7740\u7edf\u8ba1\u5185\u5bb9\u3002<\/p>\n
TODO(\u9884\u89c8):\u8bb0\u5f55\u4e86\u4ee5\u4e0b\u7684\u7edf\u8ba1<\/p>\n
data size\nindex size\nkey size (uncompressed)\nvalue size (uncompressed)\nnumber of entries\nnumber of data blocks\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
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