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Type:
Bug
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Resolution: Done
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Priority:
Major - P3
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Affects Version/s: None
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Component/s: WiredTiger
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Fully Compatible
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ALL
- single-node replica set
- 2 threads inserting 1 kB compressible documents
- 10 GB oplog, 10 GB cache
- ssd for data files, separate hdd for journal
- using this build to avoid issues with LAS file from
SERVER-21585
- once cache fills inserts stall during latter part of checkpoint
- ops with latencies up to 18779 ms are reported in mongod log
- ftdc also stalls
A similar test on 3.0.7 shows some slowdown during checkpoints but no complete stalls, and max latency seen in a similar run was 7s. (The 3.0.7 test used 15 threads instead of 2 to get comparable throughput).
function repro(threads) {
Random.setRandomSeed();
db.c.ensureIndex({y:1})
var docs = [];
for (var i = 0; i < 1000; i++) {
var x = '';
while (x.length < 1000)
x += 'x'
docs.push({x: x, y: i, z: 0});
}
var insert_ops = [{
op: 'insert',
ns: 'test.c',
doc: docs,
safe: true,
}];
var res = benchRun({
ops: insert_ops,
seconds: 10000,
parallel: threads
});
printjson(res);
}
- depends on
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WT-2244 Trigger in-memory splits sooner
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- Closed
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- is depended on by
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- Closed
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- related to
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- Closed
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