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Type:
Bug
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Resolution: Done
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Priority:
Major - P3
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None
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Affects Version/s: 2.2.1
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Component/s: Sharding
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Sharding
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ALL
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I've created a 4-shard cluster, each consisting of a replica set (3 nodes).
After enableSharding and shardCollection, I remove shard02. I then try to moveChunk the only existing chunk from shard01 to shard04. An error is thrown and the move fails:
{
"errmsg" : "exception: No replica set monitor active and no cached seed found for set: shard02",
"code" : 16340,
"ok" : 0
}
After quitting the mongo shell and restarting it, the moveChunk command works fine. Note: Nothing else (mongod, mongos) was restarted, only the shell reconnected.
Below is the history to reproduce the issue. It was tested on 2.2.0 and 2.2.1. Both versions are affected.
tr@capslock:~/Documents/code/mtools$ mongo --port 27030
MongoDB shell version: 2.2.1
connecting to: 127.0.0.1:27030/test
mongos> sh.status()
--- Sharding Status ---
sharding version: { "_id" : 1, "version" : 3 }
shards:
{ "_id" : "shard01", "host" : "shard01/capslock.local:27017,capslock.local:27018,capslock.local:27019" }
{ "_id" : "shard02", "host" : "shard02/capslock.local:27020,capslock.local:27021,capslock.local:27022" }
{ "_id" : "shard03", "host" : "shard03/capslock.local:27023,capslock.local:27024,capslock.local:27025" }
{ "_id" : "shard04", "host" : "shard04/capslock.local:27026,capslock.local:27027,capslock.local:27028" }
databases:
{ "_id" : "admin", "partitioned" : false, "primary" : "config" }
mongos> sh.enableSharding('test')
{ "ok" : 1 }
mongos> sh.shardCollection('test.docs', {shardkey: 1})
{ "collectionsharded" : "test.docs", "ok" : 1 }
mongos> sh.status()
--- Sharding Status ---
sharding version: { "_id" : 1, "version" : 3 }
shards:
{ "_id" : "shard01", "host" : "shard01/capslock.local:27017,capslock.local:27018,capslock.local:27019" }
{ "_id" : "shard02", "host" : "shard02/capslock.local:27020,capslock.local:27021,capslock.local:27022" }
{ "_id" : "shard03", "host" : "shard03/capslock.local:27023,capslock.local:27024,capslock.local:27025" }
{ "_id" : "shard04", "host" : "shard04/capslock.local:27026,capslock.local:27027,capslock.local:27028" }
databases:
{ "_id" : "admin", "partitioned" : false, "primary" : "config" }
{ "_id" : "test", "partitioned" : true, "primary" : "shard01" }
test.docs chunks:
shard01 1
{ "shardkey" : { $minKey : 1 } } -->> { "shardkey" : { $maxKey : 1 } } on : shard01 Timestamp(1000, 0)
mongos> db.adminCommand({removeShard: 'shard02'})
{
"msg" : "draining started successfully",
"state" : "started",
"shard" : "shard02",
"ok" : 1
}
mongos> db.adminCommand({removeShard: 'shard02'})
{
"msg" : "removeshard completed successfully",
"state" : "completed",
"shard" : "shard02",
"ok" : 1
}
mongos> db.adminCommand({removeShard: 'shard02'})
{
"errmsg" : "exception: can't find shard for: shard02",
"code" : 13129,
"ok" : 0
}
mongos> sh.status()
--- Sharding Status ---
sharding version: { "_id" : 1, "version" : 3 }
shards:
{ "_id" : "shard01", "host" : "shard01/capslock.local:27017,capslock.local:27018,capslock.local:27019" }
{ "_id" : "shard03", "host" : "shard03/capslock.local:27023,capslock.local:27024,capslock.local:27025" }
{ "_id" : "shard04", "host" : "shard04/capslock.local:27026,capslock.local:27027,capslock.local:27028" }
databases:
{ "_id" : "admin", "partitioned" : false, "primary" : "config" }
{ "_id" : "test", "partitioned" : true, "primary" : "shard01" }
test.docs chunks:
shard01 1
{ "shardkey" : { $minKey : 1 } } -->> { "shardkey" : { $maxKey : 1 } } on : shard01 Timestamp(1000, 0)
mongos> sh.moveChunk('test.docs', {shardkey: 0}, 'shard04')
{
"errmsg" : "exception: No replica set monitor active and no cached seed found for set: shard02",
"code" : 16340,
"ok" : 0
}
mongos> ^C
bye
tr@capslock:~/Documents/code/mtools$ mongo --port 27030
MongoDB shell version: 2.2.1
connecting to: 127.0.0.1:27030/test
mongos> sh.moveChunk('test.docs', {shardkey: 0}, 'shard04')
{ "millis" : 2236, "ok" : 1 }
mongos> sh.status()
--- Sharding Status ---
sharding version: { "_id" : 1, "version" : 3 }
shards:
{ "_id" : "shard01", "host" : "shard01/capslock.local:27017,capslock.local:27018,capslock.local:27019" }
{ "_id" : "shard03", "host" : "shard03/capslock.local:27023,capslock.local:27024,capslock.local:27025" }
{ "_id" : "shard04", "host" : "shard04/capslock.local:27026,capslock.local:27027,capslock.local:27028" }
databases:
{ "_id" : "admin", "partitioned" : false, "primary" : "config" }
{ "_id" : "test", "partitioned" : true, "primary" : "shard01" }
test.docs chunks:
shard04 1
{ "shardkey" : { $minKey : 1 } } -->> { "shardkey" : { $maxKey : 1 } } on : shard04 Timestamp(2000, 0)
mongos>
