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| author | Judah Schvimer <judah@mongodb.com> | 2018-05-16 11:14:17 -0400 |
|---|---|---|
| committer | Judah Schvimer <judah@mongodb.com> | 2018-05-16 11:43:01 -0400 |
| commit | e716867bb5c36f7ad4686cf020f5f35b9cd9636e (patch) | |
| tree | 5975df5796fd18d84b3b61192d64170fa61b7a65 | |
| parent | e205726dd5ea4effac7466efc35a9eb52fdb618d (diff) | |
| download | mongo-e716867bb5c36f7ad4686cf020f5f35b9cd9636e.tar.gz | |
SERVER-32382 set a default rollback batch size
| -rw-r--r-- | src/mongo/db/repl/bgsync.cpp | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/src/mongo/db/repl/bgsync.cpp b/src/mongo/db/repl/bgsync.cpp index 3fe778d9909..7e5ff744acc 100644 --- a/src/mongo/db/repl/bgsync.cpp +++ b/src/mongo/db/repl/bgsync.cpp @@ -80,7 +80,10 @@ MONGO_EXPORT_STARTUP_SERVER_PARAMETER(bgSyncOplogFetcherBatchSize, int, defaultB // The batchSize to use for the find/getMore queries called by the rollback common point resolver. // A batchSize of 0 means that the 'find' and 'getMore' commands will be given no batchSize. -constexpr int defaultRollbackBatchSize = 0; +// We set the default to 2000 to prevent the sync source from having to read too much data at once, +// and reduce the chance of a socket timeout. +// We choose 2000 for (10 minute timeout) * (60 sec / min) * (50 MB / second) / (16 MB / document). +constexpr int defaultRollbackBatchSize = 2000; MONGO_EXPORT_SERVER_PARAMETER(rollbackRemoteOplogQueryBatchSize, int, defaultRollbackBatchSize) ->withValidator([](const auto& potentialNewValue) { if (potentialNewValue < 0) { |