Estou tentando depurar um problema estranho que resulta na falha ou em um conjunto de réplicas tornando-se obsoleto e incapaz de recuperar o atraso com o principal (em execução no AWS, AWS linux).
O atraso típico de replicação é de < 1 seg.
Parece haver uma correlação com o desdobramento secundário desatualizado e o esgotamento primário do espaço de registro, ou seja, / var / log / mongodb /.
O oplog é armazenado em uma unidade diferente e isso tem > 50 GB de espaço livre.
Pergunta: A falha do primário em criar logs resulta em uma falha de replicação? Não consegui localizar nada nos documentos ou on-line que possa confirmar isso.
Editar para adicionar, saída de db.printReplicationInfo ():
rs0:PRIMARY> db.printReplicationInfo()
configured oplog size: 30720MB
log length start to end: 2238secs (0.62hrs)
oplog first event time: Mon Nov 09 2015 16:36:13 GMT+0000 (UTC)
oplog last event time: Mon Nov 09 2015 17:13:31 GMT+0000 (UTC)
now: Mon Nov 09 2015 17:13:31 GMT+0000 (UTC)
Edite para adicionar, saída completa do db.oplog.rs.stats local ():
{
"ns" : "local.oplog.rs",
"count" : 197021,
"size" : 32227028695,
"avgObjSize" : 163571,
"storageSize" : 11432701952,
"capped" : true,
"max" : -1,
"maxSize" : NumberLong("32212254720"),
"wiredTiger" : {
"metadata" : {
"formatVersion" : 1,
"oplogKeyExtractionVersion" : 1
},
"creationString" : "allocation_size=4KB,app_metadata=(formatVersion=1,oplogKeyExtractionVersion=1),block_allocation=best,block_compressor=snappy,cache_resident=0,checkpoint=(WiredTigerCheckpoint.44462=(addr=\"01e30119f281e455da0eb9e30d626b89e457acebd0e30d627488e4c14bdd50808080e502a9710fc0e502984f4fc0\",order=44462,time=1447092664,size=11145277440,write_gen=190060665)),checkpoint_lsn=(174452,45957760),checksum=on,collator=,columns=,dictionary=0,format=btree,huffman_key=,huffman_value=,id=9,internal_item_max=0,internal_key_max=0,internal_key_truncate=,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,memory_page_max=10m,os_cache_dirty_max=0,os_cache_max=0,prefix_compression=0,prefix_compression_min=4,split_deepen_min_child=0,split_deepen_per_child=0,split_pct=90,value_format=u,version=(major=1,minor=1)",
"type" : "file",
"uri" : "statistics:table:collection-6-8821970786560075304",
"LSM" : {
"bloom filters in the LSM tree" : 0,
"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,
"total size of bloom filters" : 0,
"sleep for LSM checkpoint throttle" : 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 merge throttle" : 0
},
"block-manager" : {
"file allocation unit size" : 4096,
"blocks allocated" : 190152428,
"checkpoint size" : 11145277440,
"allocations requiring file extension" : 225612,
"blocks freed" : 189847759,
"file magic number" : 120897,
"file major version number" : 1,
"minor version number" : 0,
"file bytes available for reuse" : 93298688,
"file size in bytes" : 11432701952
},
"btree" : {
"btree checkpoint generation" : 44481,
"column-store variable-size deleted values" : 0,
"column-store fixed-size leaf pages" : 0,
"column-store internal pages" : 0,
"column-store variable-size leaf pages" : 0,
"pages rewritten by compaction" : 0,
"number of key/value pairs" : 0,
"fixed-record size" : 0,
"maximum tree depth" : 5,
"maximum internal page key size" : 368,
"maximum internal page size" : 4096,
"maximum leaf page key size" : 3276,
"maximum leaf page size" : 32768,
"maximum leaf page value size" : 67108864,
"overflow pages" : 0,
"row-store internal pages" : 0,
"row-store leaf pages" : 0
},
"cache" : {
"bytes read into cache" : NumberLong("30740995584012"),
"bytes written from cache" : NumberLong("29998939159917"),
"checkpoint blocked page eviction" : 394628,
"unmodified pages evicted" : 164578679,
"page split during eviction deepened the tree" : 1173,
"modified pages evicted" : 61796390,
"data source pages selected for eviction unable to be evicted" : 10970507,
"hazard pointer blocked page eviction" : 7932631,
"internal pages evicted" : 3553083,
"pages split during eviction" : 3825008,
"in-memory page splits" : 15025,
"overflow values cached in memory" : 0,
"pages read into cache" : 175450372,
"overflow pages read into cache" : 0,
"pages written from cache" : 190063507
},
"compression" : {
"raw compression call failed, no additional data available" : 0,
"raw compression call failed, additional data available" : 0,
"raw compression call succeeded" : 0,
"compressed pages read" : 173302623,
"compressed pages written" : 170315036,
"page written failed to compress" : 22,
"page written was too small to compress" : 19748044
},
"cursor" : {
"create calls" : 4043133,
"insert calls" : 230047485,
"bulk-loaded cursor-insert calls" : 0,
"cursor-insert key and value bytes inserted" : NumberLong("29150212316581"),
"next calls" : 730226547,
"prev calls" : 37,
"remove calls" : 4040833,
"cursor-remove key bytes removed" : 36367497,
"reset calls" : 583047853,
"search calls" : 328774626,
"search near calls" : 5144225,
"update calls" : 0,
"cursor-update value bytes updated" : 0
},
"reconciliation" : {
"dictionary matches" : 0,
"internal page multi-block writes" : 79957,
"leaf page multi-block writes" : 3847381,
"maximum blocks required for a page" : 870,
"internal-page overflow keys" : 0,
"leaf-page overflow keys" : 0,
"overflow values written" : 0,
"pages deleted" : 9135126,
"page checksum matches" : 2604439,
"page reconciliation calls" : 62629072,
"page reconciliation calls for eviction" : 60930354,
"leaf page key bytes discarded using prefix compression" : 0,
"internal page key bytes discarded using suffix compression" : 177193166
},
"session" : {
"object compaction" : 0,
"open cursor count" : 4043133
},
"transaction" : {
"update conflicts" : 0
}
},
"nindexes" : 0,
"totalIndexSize" : 0,
"indexSizes" : {
},
"ok" : 1,
"$gleStats" : {
"lastOpTime" : Timestamp(0, 0),
"electionId" : ObjectId("5614f9ebaffca08a80d27834")
}
}
Tags mongodb