mongodb sharded cluster configured but not working
https://dba.stackexchange.com/questions/189999
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10-10-2020 - |
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I have configured a sharded cluster on aws on a replicaSet composed on two server, a config server and a front server and mongo 3.4. I followed mainly this tutorial :
The configuration seems correct. however, when I tried to insert 1.000.000 docuements on the clients collection, the data was not chunked.
Could you help please.
mongos> db.printShardingStatus({verbose:true})
--- Sharding Status ---
sharding version: {
"_id" : 1,
"minCompatibleVersion" : 5,
"currentVersion" : 6,
"clusterId" : ObjectId("59fb2f9173d9611f98c95eb3")
}
shards:
{ "_id" : "rs1", "host" : "rs1/172.31.12.34:27018,172.31.13.80:27018", "state" : 1 }
active mongoses:
{ "_id" : "ip-172-31-25-254:27017", "ping" : ISODate("2017-11-02T23:04:26.780Z"), "up" : NumberLong(14602), "waiting" : true, "mongoVersion" : "3.4.10" }
autosplit:
Currently enabled: yes
balancer:
Currently enabled: yes
Currently running: no
NaN
Failed balancer rounds in last 5 attempts: 5
Last reported error: could not find host matching read preference { mode: "primary" } for set rs2
Time of Reported error: Thu Nov 02 2017 18:56:13 GMT+0000 (UTC)
Migration Results for the last 24 hours:
No recent migrations
databases:
{ "_id" : "tests", "primary" : "rs1", "partitioned" : true }
tests.clients
shard key: { "num" : 1 }
unique: false
balancing: true
chunks:
rs1 1
{ "num" : { "$minKey" : 1 } } -->> { "num" : { "$maxKey" : 1 } } on : rs1 Timestamp(1, 0)
mongos> db.clients.stats()
{
"sharded" : true,
"capped" : false,
"ns" : "tests.clients",
"count" : 1000000,
"size" : 35000000,
"storageSize" : 12296192,
"totalIndexSize" : 9867264,
"indexSizes" : {
"_id_" : 9867264
},
"avgObjSize" : 35,
"nindexes" : 1,
"nchunks" : 1,
"shards" : {
"rs1" : {
"ns" : "tests.clients",
"size" : 35000000,
"count" : 1000000,
"avgObjSize" : 35,
"storageSize" : 12296192,
"capped" : false,
"wiredTiger" : {
"metadata" : {
"formatVersion" : 1
},
"creationString" : "access_pattern_hint=none,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-11-1418402185877323060",
"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" : 1454,
"blocks allocated" : 1622,
"blocks freed" : 109,
"checkpoint size" : 12238848,
"file allocation unit size" : 4096,
"file bytes available for reuse" : 40960,
"file magic number" : 120897,
"file major version number" : 1,
"file size in bytes" : 12296192,
"minor version number" : 0
},
"btree" : {
"btree checkpoint generation" : 379,
"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" : 3,
"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" : 10945398,
"bytes read into cache" : 0,
"bytes written from cache" : 43275208,
"checkpoint blocked page eviction" : 0,
"data source pages selected for eviction unable to be evicted" : 0,
"hazard pointer blocked page eviction" : 0,
"in-memory page passed criteria to be split" : 18,
"in-memory page splits" : 9,
"internal pages evicted" : 0,
"internal pages split during eviction" : 0,
"leaf pages split during eviction" : 29,
"modified pages evicted" : 29,
"overflow pages read into cache" : 0,
"overflow values cached in memory" : 0,
"page split during eviction deepened the tree" : 0,
"page written requiring lookaside records" : 0,
"pages read into cache" : 0,
"pages read into cache requiring lookaside entries" : 0,
"pages requested from the cache" : 1000028,
"pages written from cache" : 1577,
"pages written requiring in-memory restoration" : 2,
"tracked dirty bytes in the cache" : 0,
"unmodified pages evicted" : 1195
},
"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" : 0,
"compressed pages written" : 1526,
"page written failed to compress" : 0,
"page written was too small to compress" : 51,
"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" : 5,
"cursor-insert key and value bytes inserted" : 38917635,
"cursor-remove key bytes removed" : 0,
"cursor-update value bytes updated" : 0,
"insert calls" : 1000000,
"next calls" : 1,
"prev calls" : 1,
"remove calls" : 0,
"reset calls" : 1000002,
"restarted searches" : 0,
"search calls" : 0,
"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" : 4198,
"internal page multi-block writes" : 18,
"internal-page overflow keys" : 0,
"leaf page key bytes discarded using prefix compression" : 0,
"leaf page multi-block writes" : 52,
"leaf-page overflow keys" : 0,
"maximum blocks required for a page" : 54,
"overflow values written" : 0,
"page checksum matches" : 644,
"page reconciliation calls" : 93,
"page reconciliation calls for eviction" : 29,
"pages deleted" : 0
},
"session" : {
"object compaction" : 0,
"open cursor count" : 1
},
"transaction" : {
"update conflicts" : 0
}
},
解決
As your sh.status() says:
shards:
{ "_id" : "rs1", "host" : "rs1/172.31.12.34:27018,172.31.13.80:27018", "state" : 1 }
You have only ONE shard active in your cluster. There is no place where balancer could balance.
Error message says:
could not find host matching read preference { mode: "primary" } for set rs2
So, check your configuration. RS2 that it is working (it have primary) and it is added to cluster and listed in the sh.status().
他のヒント
I added the second shard as you requested. however, nothing changer. I remodved all the existing documents and added 1.000.000 new document.
mongos> sh.status()
--- Sharding Status ---
sharding version: {
"_id" : 1,
"minCompatibleVersion" : 5,
"currentVersion" : 6,
"clusterId" : ObjectId("59fb2f9173d9611f98c95eb3")
}
shards:
{ "_id" : "rs1", "host" : "rs1/172.31.12.34:27018,172.31.13.80:27018", "state" : 1 }
{ "_id" : "rs2", "host" : "rs2/ip-172-31-0-181:27018", "state" : 1 }
active mongoses:
"3.4.10" : 1
autosplit:
Currently enabled: yes
balancer:
Currently enabled: yes
Currently running: no
NaN
Failed balancer rounds in last 5 attempts: 5
Last reported error: could not find host matching read preference { mode: "primary" } for set rs2
Time of Reported error: Thu Nov 02 2017 18:56:13 GMT+0000 (UTC)
Migration Results for the last 24 hours:
No recent migrations
databases:
{ "_id" : "tests", "primary" : "rs1", "partitioned" : true }
tests.clients
shard key: { "num" : 1 }
unique: false
balancing: true
chunks:
rs1 1
{ "num" : { "$minKey" : 1 } } -->> { "num" : { "$maxKey" : 1 } } on : rs1 Timestamp(1, 0)
tests.vquest_metadata
shard key: { "_id" : 1 }
unique: false
balancing: true
chunks:
rs1 1
{ "_id" : { "$minKey" : 1 } } -->> { "_id" : { "$maxKey" : 1 } } on : rs1 Timestamp(1, 0)
mongos>
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