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Environment:
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Amazon Linux:
cat /etc/os-release
NAME="Amazon Linux AMI"
VERSION="2016.03"
ID="amzn"
ID_LIKE="rhel fedora"
VERSION_ID="2016.03"
PRETTY_NAME="Amazon Linux AMI 2016.03"
EC2 instance type: i3.4xlarge, ephemeral storage
Mongo 3.2.11, community edition
3-node replica set
replication stayed intact during the event
db.stats();
{
"db" : "video",
"collections" : 15,
"objects" : 189601049,
"avgObjSize" : 322.20348721804805,
"dataSize" : 61090119168,
"storageSize" : 26507411456,
"numExtents" : 0,
"indexes" : 62,
"indexSize" : 22200733696,
"ok" : 1
}
db.coll.stats()
{
"ns" : < redacted />,
"count" : 189590,
"size" : 78869440,
"avgObjSize" : 416,
"storageSize" : 270233600,
"capped" : false,
"wiredTiger" : {
"metadata" :
{
"formatVersion" : 1
}
,
"creationString" : "allocation_size=4KB,app_metadata=(formatVersion=1),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_max=15,merge_min=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-25-6542812937956687151",
"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" : 108716,
"blocks allocated" : 3378588,
"blocks freed" : 3300241,
"checkpoint size" : 24412160,
"file allocation unit size" : 4096,
"file bytes available for reuse" : 245805056,
"file magic number" : 120897,
"file major version number" : 1,
"file size in bytes" : 270233600,
"minor version number" : 0
}
,
"btree" :
{
"btree checkpoint generation" : 25214,
"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" : 4,
"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" : 71643643,
"bytes read into cache" : 60930147340,
"bytes written from cache" : 86565034308,
"checkpoint blocked page eviction" : 6,
"data source pages selected for eviction unable to be evicted" : 25790,
"hazard pointer blocked page eviction" : 1412,
"in-memory page passed criteria to be split" : 415,
"in-memory page splits" : 216,
"internal pages evicted" : 61443,
"internal pages split during eviction" : 3,
"leaf pages split during eviction" : 542,
"modified pages evicted" : 814217,
"overflow pages read into cache" : 0,
"overflow values cached in memory" : 0,
"page split during eviction deepened the tree" : 1,
"page written requiring lookaside records" : 0,
"pages read into cache" : 2319194,
"pages read into cache requiring lookaside entries" : 0,
"pages requested from the cache" : 32208865760,
"pages written from cache" : 3328351,
"pages written requiring in-memory restoration" : 1856,
"unmodified pages evicted" : 1561421
}
,
"cache_walk" :
{
"Average difference between current eviction generation when the page was last considered" : 0,
"Average on-disk page image size seen" : 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,
"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" : 2253153,
"compressed pages written" : 3071496,
"page written failed to compress" : 0,
"page written was too small to compress" : 256849,
"raw compression call failed, additional data available" : 0,
"raw compression call failed, no additional data available" : 0,
"raw compression call succeeded" : 0
}
,
"cursor" :
{
"bulk-loaded cursor-insert calls" : 0,
"create calls" : 57487,
"cursor-insert key and value bytes inserted" : 47544376271,
"cursor-remove key bytes removed" : 9788001,
"cursor-update value bytes updated" : 0,
"insert calls" : 113143604,
"next calls" : 92601311,
"prev calls" : 1,
"remove calls" : 2466220,
"reset calls" : 1934752542,
"restarted searches" : 299,
"search calls" : 155871005685,
"search near calls" : 4727262,
"truncate calls" : 0,
"update calls" : 0
}
,
"reconciliation" :
{
"dictionary matches" : 0,
"fast-path pages deleted" : 0,
"internal page key bytes discarded using suffix compression" : 2157000,
"internal page multi-block writes" : 28994,
"internal-page overflow keys" : 0,
"leaf page key bytes discarded using prefix compression" : 0,
"leaf page multi-block writes" : 34541,
"leaf-page overflow keys" : 0,
"maximum blocks required for a page" : 128,
"overflow values written" : 0,
"page checksum matches" : 875369,
"page reconciliation calls" : 1881019,
"page reconciliation calls for eviction" : 57237,
"pages deleted" : 36443
}
,
"session" :
{
"object compaction" : 0,
"open cursor count" : 600
}
,
"transaction" :
{
"update conflicts" : 189
}
},
"nindexes" : 8,
"totalIndexSize" : 17039360,
"indexSizes" :
{
"_id_" : 6955008,
"_p_userDetails_1__p_socialNetwork_1__created_at_-1" : 7241728,
"broadcasterAge_1" : 36864,
"_created_at_1" : 2543616,
"activeUntil_1_currentViewers_-1__created_at_-1" : 69632,
"activeUntil_1_currentViewers_-1__created_at_1" : 69632,
"activeUntil_1_currentViewers_-1" : 53248,
"activeUntil_1__created_at_1_currentViewers_-1" : 69632
}
,
"ok" : 1
}
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