Error: “panic: close of closed channel”

Question

Scenario:

I had a standalone MongoDB Server v3.4.x where I had several DBs and collections respectively. As the plan was to upgrade to lastest 4.2.x, I have created a mongo dump of all DBs.

Created a shard cluster of config server (replica cluster), shard-1 server (replica cluster) & shard-2 server (cluster) [MongoDB v4.2.x]

Issue:

Now when I try to restore the dump, it's partially restoring every time I try to restore DBs. If I try to restore single DB it fails with same error. But whenever I try to restore specific DB & specific collection it always works fine. But the problem is so many collections across many DBs. Cannot do it for all indicvidually & every time it fails at different progress percentage

錯誤:

2020-02-07719:07:03.822+0000 [#####################...] myproduct_new.chats 68.1MB/74.8MB (91.0%)
2020-02-07719:07:03.851+0000 [########## ] myproduct_new.metaCrashes 216MB/502MB (42.9%) 
2020-02-07719:07:03.876+0000 [################## ] myproduct_new.feeds 152MB/196MB (77.4%)

panic: close of closed channel
goroutine 25 [running]: github.com/mongodb/mongo-tools/mongorestore.(*MongoRestore).RestoreCollectionToDB(Oxc0001a0000, 0xc000234540, Oxc, 0xc00023454d, 900, Ox7fa5503e21f0, 0xc00020b890, 0x1f66e326, Ox0, ...)

/data/mci/533e19bcc94a47bf738334351cf58a07/src/src/mongo/gotools/src/github.com/mongodb/mongo-tools/mongorestore/restore. github.com/mongodb/mongo-tools/mongorestore.(*MongoRestore).RestoreIntent(Oxc0001a0000, Oxc00022f9e0, Ox0, Ox0, Ox0, Ox0) 
/data/mci/533e19bcc94a47bf738334351cf58a07/src/src/mongo/gotools/src/github.com/mongodb/mongo-tools/mongorestore/restore. github.com/mongodb/mongo-tools/mongorestore.(*MongoRestore).RestoreIntents.funcl(Oxc0001a0000, 0xc000146420, 0x3) 
/data/mci/533e19bcc94a47bf738334351cf58a07/src/src/mongo/gotools/src/github.com/mongodb/mongo-tools/mongorestore/restore. created by github.com/mongodb/mongo-tools/mongorestore.(*MongoRestore).RestoreIntents 
/data/mci/533e19bcc94a47bf738334351cf58a07/src/src/mongo/gotools/src/github.com/mongodb/mongo-tools/mongorestore/restore. ubuntu@ip-00-xxx-xxx-00:/usr/local/backups/Dev_backup_07-02-2020$  Ox10, Oxc00000f go:503 +0x49b go:311 +Oxbe9 go:126 +Oxlcb go:109
    +0x12d

問題編號:

我正在连接到mongos并试图恢复。目前，任何一个DB的sharding都还没有启用。谁能给点提示，看看是哪里出了问题，或者如何恢复转储？

Answer 1

我也遇到了同样的问题，后来我发现是我的mongodb复制集的问题导致了这个错误。

请检查 rs.status() 的数据库。

如果你收到的信息是

我们的副本集配置无效，或者我们不是它的成员。

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