问题描述
我不明白为什么次要的存储空间比主要的要大很多（450 GB 对 375 GB）。
- 主要和次要的硬件、操作系统、文件系统和 mongodb 配置相同
- 存储引擎是有线老虎
- 每天都会创建一个新数据库，其中存储当天的历史数据
- 保留过去 14 天（数据库）
- 最旧的数据库在一天之后被删除
- 文档永远不会被更新或删除，它们只会被插入和读取
- 过去没有主要/次要开关
正如您在集合统计信息中看到的那样，count 和 avgobjectsize 在主要和次要之间是相同的，但 storageSize 是不同的。为什么会这样？可以修复吗（如何）？
offerHistory02:SECONDARY> db.offerHistory.stats()
{
"ns" : "log-2021-03-27.offerHistory","size" : NumberLong("1147404775489"),"count" : 1293199443,"avgobjSize" : 887,"storageSize" : 483053527040,"capped" : false,"wiredTiger" : {
"Metadata" : {
"formatVersion" : 1
},"creationString" : "access_pattern_hint=none,allocation_size=4KB,app_Metadata=(formatVersion=1),assert=(commit_timestamp=none,read_timestamp=none),block_allocation=best,block_compressor=snappy,cache_resident=false,checksum=on,colgroups=,collator=,columns=,dictionary=0,encryption=(keyid=,name=),exclusive=false,extractor=,format=btree,huffman_key=,huffman_value=,ignore_in_memory_cache_size=false,immutable=false,internal_item_max=0,internal_key_max=0,internal_key_truncate=true,internal_page_max=4KB,key_format=q,key_gap=10,leaf_item_max=0,leaf_key_max=0,leaf_page_max=32KB,leaf_value_max=64MB,log=(enabled=true),lsm=(auto_throttle=true,bloom=true,bloom_bit_count=16,bloom_config=,bloom_hash_count=8,bloom_oldest=false,chunk_count_limit=0,chunk_max=5GB,chunk_size=10MB,merge_custom=(prefix=,start_generation=0,suffix=),merge_max=15,merge_min=0),memory_page_image_max=0,memory_page_max=10m,os_cache_dirty_max=0,os_cache_max=0,prefix_compression=false,prefix_compression_min=4,source=,split_deepen_min_child=0,split_deepen_per_child=0,split_pct=90,type=file,value_format=u","type" : "file","uri" : "statistics:table:collection-2583--5720839012155665746","LSM" : {
"bloom filter false positives" : 0,"bloom filter hits" : 0,"bloom filter misses" : 0,"bloom filter pages evicted from cache" : 0,"bloom filter pages read into cache" : 0,"bloom filters in the LSM tree" : 0,"chunks in the LSM tree" : 0,"highest merge generation in the LSM tree" : 0,"queries that Could have benefited from a Bloom filter that did not exist" : 0,"sleep for LSM checkpoint throttle" : 0,"sleep for LSM merge throttle" : 0,"total size of bloom filters" : 0
},"block-manager" : {
"allocations requiring file extension" : 72040317,"blocks allocated" : 72069969,"blocks freed" : 32831,"checkpoint size" : 483052630016,"file allocation unit size" : 4096,"file bytes available for reuse" : 880640,"file magic number" : 120897,"file major version number" : 1,"file size in bytes" : 483053527040,"minor version number" : 0
},"btree" : {
"btree checkpoint generation" : 322002,"column-store fixed-size leaf pages" : 0,"column-store internal pages" : 0,"column-store variable-size RLE encoded values" : 0,"column-store variable-size deleted values" : 0,"column-store variable-size leaf pages" : 0,"fixed-record size" : 0,"maximum internal page key size" : 368,"maximum internal page size" : 4096,"maximum leaf page key size" : 2867,"maximum leaf page size" : 32768,"maximum leaf page value size" : 67108864,"maximum tree depth" : 5,"number of key/value pairs" : 0,"overflow pages" : 0,"pages rewritten by compaction" : 0,"row-store internal pages" : 0,"row-store leaf pages" : 0
},"cache" : {
"bytes currently in the cache" : 427430184,"bytes read into cache" : 1750413,"bytes written from cache" : NumberLong("1163389289271"),"checkpoint blocked page eviction" : 11018,"data source pages selected for eviction unable to be evicted" : 924534,"eviction walk passes of a file" : 10012883,"eviction walk target pages histogram - 0-9" : 2069657,"eviction walk target pages histogram - 10-31" : 886769,"eviction walk target pages histogram - 128 and higher" : 0,"eviction walk target pages histogram - 32-63" : 433587,"eviction walk target pages histogram - 64-128" : 6622870,"eviction walks abandoned" : 44203,"eviction walks gave up because they restarted their walk twice" : 1968,"eviction walks gave up because they saw too many pages and found no candidates" : 1804734,"eviction walks gave up because they saw too many pages and found too few candidates" : 14522,"eviction walks reached end of tree" : 1818021,"eviction walks started from root of tree" : 1866522,"eviction walks started from saved location in tree" : 8146361,"hazard pointer blocked page eviction" : 73210,"in-memory page passed criteria to be split" : 923037,"in-memory page splits" : 147932,"internal pages evicted" : 531175,"internal pages split during eviction" : 5277,"leaf pages split during eviction" : 170222,"modified pages evicted" : 184054588,"overflow pages read into cache" : 0,"page split during eviction deepened the tree" : 2,"page written requiring cache overflow records" : 0,"pages read into cache" : 137,"pages read into cache after truncate" : 1,"pages read into cache after truncate in prepare state" : 0,"pages read into cache requiring cache overflow entries" : 0,"pages requested from the cache" : 3732724262,"pages seen by eviction walk" : 992177213,"pages written from cache" : 72067093,"pages written requiring in-memory restoration" : 142958112,"tracked dirty bytes in the cache" : 0,"unmodified pages evicted" : 60247131
},"cache_walk" : {
"Average difference between current eviction generation when the page was last considered" : 0,"Average on-disk page image size seen" : 0,"Average time in cache for pages that have been visited by the eviction server" : 0,"Average time in cache for pages that have not been visited by the eviction server" : 0,"Clean pages currently in cache" : 0,"Current eviction generation" : 0,"Dirty pages currently in cache" : 0,"Entries in the root page" : 0,"Internal pages currently in cache" : 0,"Leaf pages currently in cache" : 0,"Maximum difference between current eviction generation when the page was last considered" : 0,"Maximum page size seen" : 0,"Minimum on-disk page image size seen" : 0,"Number of pages never visited by eviction server" : 0,"on-disk page image sizes smaller than a single allocation unit" : 0,"Pages created in memory and never written" : 0,"Pages currently queued for eviction" : 0,"Pages that Could not be queued for eviction" : 0,"Refs skipped during cache traversal" : 0,"Size of the root page" : 0,"Total number of pages currently in cache" : 0
},"compression" : {
"compressed pages read" : 63,"compressed pages written" : 61677121,"page written Failed to compress" : 32009,"page written was too small to compress" : 10311695,"raw compression call Failed,additional data available" : 0,no additional data available" : 0,"raw compression call succeeded" : 0
},"cursor" : {
"bulk-loaded cursor-insert calls" : 0,"close calls that result in cache" : 0,"create calls" : 61,"cursor operation restarted" : 176248823,"cursor-insert key and value bytes inserted" : 1087461754174,"cursor-remove key bytes removed" : 0,"cursor-update value bytes updated" : 0,"cursors reused from cache" : 211664692,"insert calls" : 1220619643,"modify calls" : 0,"next calls" : 397,"open cursor count" : 0,"prev calls" : 1,"remove calls" : 0,"reserve calls" : 0,"reset calls" : 539520296,"search calls" : 76,"search near calls" : 0,"truncate calls" : 0,"update calls" : 0
},"reconciliation" : {
"dictionary matches" : 0,"fast-path pages deleted" : 0,"internal page key bytes discarded using suffix compression" : 60661951,"internal page multi-block writes" : 28312,"internal-page overflow keys" : 0,"leaf page key bytes discarded using prefix compression" : 0,"leaf page multi-block writes" : 150396,"leaf-page overflow keys" : 0,"maximum blocks required for a page" : 1,"overflow values written" : 0,"page checksum matches" : 90452,"page reconciliation calls" : 226401610,"page reconciliation calls for eviction" : 176333404,"pages deleted" : 41475470
},"session" : {
"object compaction" : 0
},"transaction" : {
"update conflicts" : 0
}
},"nindexes" : 2,"totalIndexSize" : 59087273984,"indexSizes" : {
"_id_" : 34540539904,"offerId_1" : 24546734080
},"ok" : 1,"operationTime" : Timestamp(1617146426,6416),"$gleStats" : {
"lastOpTime" : Timestamp(0,0),"electionId" : ObjectId("7fffffff000000000000000b")
},"$configserverState" : {
"opTime" : {
"ts" : Timestamp(1617146426,4484),"t" : NumberLong(23)
}
},"$clusterTime" : {
"clusterTime" : Timestamp(1617146426,6443),"signature" : {
"hash" : BinData(0,"o3Sx+m0MnfXkEQkfdUHHJWnlRl8="),"keyId" : NumberLong("6899518352868248974")
}
}
}
对比：
offerHistory02:PRIMARY> db.offerHistory.stats()
{
"ns" : "log-2021-03-27.offerHistory","storageSize" : 403410546688,"uri" : "statistics:table:collection-2583--1868846566931849507","block-manager" : {
"allocations requiring file extension" : 47004346,"blocks allocated" : 47029067,"blocks freed" : 32112,"checkpoint size" : 403410251776,"file bytes available for reuse" : 278528,"file size in bytes" : 403410546688,"btree" : {
"btree checkpoint generation" : 329809,"cache" : {
"bytes currently in the cache" : 519160231,"bytes read into cache" : 108549491,"bytes written from cache" : NumberLong("1161908962381"),"checkpoint blocked page eviction" : 4910,"data source pages selected for eviction unable to be evicted" : 241550,"eviction walk passes of a file" : 5058704,"eviction walk target pages histogram - 0-9" : 1441924,"eviction walk target pages histogram - 10-31" : 706198,"eviction walk target pages histogram - 32-63" : 324631,"eviction walk target pages histogram - 64-128" : 2585951,"eviction walks abandoned" : 62344,"eviction walks gave up because they restarted their walk twice" : 0,"eviction walks gave up because they saw too many pages and found no candidates" : 1249672,"eviction walks gave up because they saw too many pages and found too few candidates" : 23472,"eviction walks reached end of tree" : 1139902,"eviction walks started from root of tree" : 1335874,"eviction walks started from saved location in tree" : 3722830,"hazard pointer blocked page eviction" : 9346,"in-memory page passed criteria to be split" : 551341,"in-memory page splits" : 148613,"internal pages evicted" : 247462,"internal pages split during eviction" : 2425,"leaf pages split during eviction" : 167334,"modified pages evicted" : 57437477,"pages read into cache" : 8699,"pages requested from the cache" : 3808973750,"pages seen by eviction walk" : 569860253,"pages written from cache" : 47026827,"pages written requiring in-memory restoration" : 50006230,"unmodified pages evicted" : 39345995
},"compression" : {
"compressed pages read" : 3402,"compressed pages written" : 44862562,"page written Failed to compress" : 3760,"page written was too small to compress" : 2135269,"create calls" : 376,"cursor operation restarted" : 8863521,"cursor-insert key and value bytes inserted" : NumberLong("1151926070153"),"cursors reused from cache" : 133353675,"insert calls" : 1291054491,"next calls" : 1,"open cursor count" : 17699,"reset calls" : 266569743,"search calls" : 4385,"internal page key bytes discarded using suffix compression" : 79075940,"internal page multi-block writes" : 25191,"leaf page multi-block writes" : 151115,"page checksum matches" : 182737,"page reconciliation calls" : 64953107,"page reconciliation calls for eviction" : 56370626,"pages deleted" : 7290000
},"totalIndexSize" : 57366028288,"indexSizes" : {
"_id_" : 33265238016,"offerId_1" : 24100790272
},"electionId" : ObjectId("7fffffff000000000000000c")
},4501),"keyId" : NumberLong("6899518352868248974")
}
}
}
解决方法
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