unable to read root page from file:sizeStorer.wt

[Seeyou Qiu]

Mongodb can't be started when the mongodb server is out of normal power.what can I do to repair mongodb?

log:

2017-08-18T03:06:22.147+0800 E STORAGE  [initandlisten] WiredTiger (-31802) [1502996782:147192][11674:0x7f081e961cc0], file:sizeStorer.wt, WT_SESSION.open_cursor: unable to read root page from file:sizeStorer.wt: WT_ERROR: non-specific WiredTiger error

2017-08-18T03:06:22.147+0800 I -        [initandlisten] Invariant failure: ret resulted in status UnknownError: -31802: WT_ERROR: non-specific WiredTiger error at src/mongo/db/storage/wiredtiger/wiredtiger_size_storer.cpp 67

2017-08-18T03:06:22.152+0800 I CONTROL  [initandlisten]

[Kevin Adistambha]

Hi

unable to read root page from file:sizeStorer.wt

That error could mean either:

• The sizeStorer.wt file is corrupt, or
• The WiredTiger.wt file is corrupt, or
• Either of those files was changed manually in the dbpath of MongoDB.

At this point, the quickest way to get your deployment in working order is to restore from a recent backup. Please also ensure that the recommendations in the Production Notes are followed to minimize any potential issues in the future.

You mentioned that power was cut in your deployment. However, this alone is usually not sufficient to corrupt WiredTiger files. Could you elaborate further on what happened? This corruption is typically caused by failures in the storage hardware (e.g. corrupt disk, hardware issues, etc.)

Best regards,
Kevin

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