Mongod operations that support yielding must periodically yield a db lock voluntarily. The map reduce implementation does not yield the db lock voluntarily while its cursor iterates over non matching documents.
from mr.cpp
while ( cursor->ok() ) { if ( ! cursor->currentMatches() ) { cursor->advance(); continue; }
- is duplicated by
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SERVER-9905 mapreduce can lock the server (both read and write) for long periods of time
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- Closed
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- is related to
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SERVER-6818 audit map / reduce yield recovery cases
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- Closed
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- related to
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- Closed
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- Closed
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