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 }