After dropping capped collection of certain size, I would expect recreating it to reuse the space but dropping a 5GB capped collection and then recreating it always allocates two new physical 2GB db.x files.
> db.stats(1024*1024)
{
"db" : "cap",
"collections" : 9,
"objects" : 8732496,
"avgObjSize" : 203.08234896414496,
"dataSize" : 1691,
"storageSize" : 5130,
"numExtents" : 12,
"indexes" : 19,
"indexSize" : 1947,
"fileSize" : 10299,
"nsSizeMB" : 16,
"dataFileVersion" : {
"major" : 4,
"minor" : 5
},
"ok" : 1
}
> db.sms_message_event.stats(1024*1024)
{
"ns" : "cap.sms_message_event",
"count" : 0,
"size" : 0,
"storageSize" : 5120,
"numExtents" : 4,
"nindexes" : 1,
"lastExtentSize" : 0,
"paddingFactor" : 1,
"systemFlags" : 1,
"userFlags" : 0,
"totalIndexSize" : 0,
"indexSizes" : {
"_id_" : 0
},
"capped" : true,
"max" : NumberLong("9223372036854775807"),
"ok" : 1
}
> db.sms_message_event.drop()
true
cap@local(2.4.2-rc0) > db.stats(1024*1024)
{
"db" : "cap",
"collections" : 8,
"objects" : 83,
"avgObjSize" : 58.795180722891565,
"dataSize" : 0,
"storageSize" : 10,
"numExtents" : 8,
"indexes" : 13,
"indexSize" : 0,
"fileSize" : 12346,
"nsSizeMB" : 16,
"dataFileVersion" : {
"major" : 4,
"minor" : 5
},
"ok" : 1
}
cap@local(2.4.2-rc0) > db.createCollection("sms_message_event",{capped:true, size:5*1024*1024*1024})
{ "ok" : 1 }
cap@local(2.4.2-rc0) > db.stats(1024*1024)
{
"db" : "cap",
"collections" : 9,
"objects" : 86,
"avgObjSize" : 59.395348837209305,
"dataSize" : 0,
"storageSize" : 5130,
"numExtents" : 12,
"indexes" : 14,
"indexSize" : 0,
"fileSize" : 16440,
"nsSizeMB" : 16,
"dataFileVersion" : {
"major" : 4,
"minor" : 5
},
"ok" : 1
}
Looking in my /data/db after each new drop followed by create I have a new file for that DB:
asyasmacbook:db asya13$ ls -lhu cap* -rw------- 1 asya13 staff 64M Apr 27 10:16 cap.0 -rw------- 1 asya13 staff 2.0G Apr 27 10:16 cap.1 -rw------- 1 asya13 staff 2.0G Apr 27 10:09 cap.2 -rw------- 1 asya13 staff 2.0G Apr 27 10:09 cap.3 -rw------- 1 asya13 staff 2.0G Apr 27 10:09 cap.4 -rw------- 1 asya13 staff 2.0G Apr 27 10:09 cap.5 -rw------- 1 asya13 staff 2.0G Apr 27 10:09 cap.6 -rw------- 1 asya13 staff 16M Apr 27 10:16 cap.ns asyasmacbook:db asya13$ ls -lhu cap* -rw------- 1 asya13 staff 64M Apr 27 10:16 cap.0 -rw------- 1 asya13 staff 2.0G Apr 27 10:16 cap.1 -rw------- 1 asya13 staff 2.0G Apr 27 10:09 cap.2 -rw------- 1 asya13 staff 2.0G Apr 27 10:09 cap.3 -rw------- 1 asya13 staff 2.0G Apr 27 10:09 cap.4 -rw------- 1 asya13 staff 2.0G Apr 27 10:09 cap.5 -rw------- 1 asya13 staff 2.0G Apr 27 10:09 cap.6 -rw------- 1 asya13 staff 2.0G Apr 27 10:16 cap.7 -rw------- 1 asya13 staff 16M Apr 27 10:16 cap.ns asyasmacbook:db asya13$ ls -lhu cap* -rw------- 1 asya13 staff 64M Apr 27 10:22 cap.0 -rw------- 1 asya13 staff 2.0G Apr 27 10:16 cap.1 -rw------- 1 asya13 staff 2.0G Apr 27 10:09 cap.2 -rw------- 1 asya13 staff 2.0G Apr 27 10:16 cap.3 -rw------- 1 asya13 staff 2.0G Apr 27 10:09 cap.4 -rw------- 1 asya13 staff 2.0G Apr 27 10:22 cap.5 -rw------- 1 asya13 staff 2.0G Apr 27 10:16 cap.6 -rw------- 1 asya13 staff 2.0G Apr 27 10:16 cap.7 -rw------- 1 asya13 staff 2.0G Apr 27 10:16 cap.8 -rw------- 1 asya13 staff 16M Apr 27 10:22 cap.ns
Here is a repeat showing two more files and times of creation to the second:
asyasmacbook:db asya13$ ls -ltrhUT cap* -rw------- 1 asya13 staff 16M Apr 27 08:45:19 2013 cap.ns -rw------- 1 asya13 staff 64M Apr 27 08:45:19 2013 cap.0 -rw------- 1 asya13 staff 2.0G Apr 27 09:02:42 2013 cap.1 -rw------- 1 asya13 staff 2.0G Apr 27 09:02:48 2013 cap.2 -rw------- 1 asya13 staff 2.0G Apr 27 09:02:54 2013 cap.3 -rw------- 1 asya13 staff 2.0G Apr 27 09:39:48 2013 cap.4 -rw------- 1 asya13 staff 2.0G Apr 27 09:39:54 2013 cap.5 -rw------- 1 asya13 staff 2.0G Apr 27 10:08:57 2013 cap.6 -rw------- 1 asya13 staff 2.0G Apr 27 10:16:22 2013 cap.7 -rw------- 1 asya13 staff 2.0G Apr 27 10:16:27 2013 cap.8 -rw------- 1 asya13 staff 2.0G Apr 27 10:25:11 2013 cap.9 -rw------- 1 asya13 staff 2.0G Apr 27 10:25:16 2013 cap.10
- is related to
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DOCS-4097 Oplog resize can cause out of disk space
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- Closed
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- Closed
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