https://bugs.openldap.org/show_bug.cgi?id=10275
Issue ID: 10275 Summary: mdb_load could use a parameter to pass batch size Product: LMDB Version: 0.9.21 Hardware: All OS: All Status: UNCONFIRMED Keywords: needs_review Severity: normal Priority: --- Component: tools Assignee: bugs@openldap.org Reporter: gkwicker@amazon.com Target Milestone: ---
Created attachment 1037 --> https://bugs.openldap.org/attachment.cgi?id=1037&action=edit Patch to mdb_load.c in version 0.9.21
mdb_load is very slow when ingesting a large db. The attached patch (0.9.21 but will apply to other versions with modification) allows the user to pass a batch size to be used instead of the default value of 100. Changing the batch size to a larger value improves ingestion speed.
I, Gary Wicker, hereby place the following modifications to OpenLDAP Software (and only these modifications) into the public domain. Hence, these modifications may be freely used and/or redistributed for any purpose with or without attribution and/or other notice.
https://bugs.openldap.org/show_bug.cgi?id=10275
--- Comment #1 from Howard Chu hyc@openldap.org --- Increasing the batch size is a bit risky, since it doesn't take into account transactions with very large data items, which could overflow the txn dirty list and cause page spills - which would then reduce performance, defeating the point of this.
It probably would be better to add a NoSync option instead, if all you want is the fastest possible load time.
https://bugs.openldap.org/show_bug.cgi?id=10275
gkwicker@amazon.com changed:
What |Removed |Added ---------------------------------------------------------------------------- Attachment #1037|0 |1 is obsolete| |
--- Comment #2 from gkwicker@amazon.com --- Created attachment 1039 --> https://bugs.openldap.org/attachment.cgi?id=1039&action=edit Added Quick mode (-Q) flag to mdb_load for faster loading with MDB_NOSYNC
Added Quick mode (-Q) flag to mdb_load for faster loading with MDB_NOSYNC
For version 0.9.21, should work in other versions with modification.
https://bugs.openldap.org/show_bug.cgi?id=10275
--- Comment #3 from gkwicker@amazon.com --- Thanks for the suggestion Howard, that makes sense. Uploaded a replacement patch which adds a "-Q" (Quick mode) flag to use MDB_NOSYNC during loading and force sync before exit. The patch also updates the mdb_load man page.
I, Gary Wicker, hereby place the following modifications to OpenLDAP Software (and only these modifications) into the public domain. Hence, these modifications may be freely used and/or redistributed for any purpose with or without attribution and/or other notice.
https://bugs.openldap.org/show_bug.cgi?id=10275
--- Comment #4 from Howard Chu hyc@openldap.org --- Thanks for the patch.
The tool should be silent for normal operation; the message printf("Using MDB_NOSYNC flag, will force sync before exit");
is unnecessary. And even if we were to include such messages, since they're not related to the actual program output they would belong on stderr, not stdout.
I'm going to delete that line from the patch.
https://bugs.openldap.org/show_bug.cgi?id=10275
Howard Chu hyc@openldap.org changed:
What |Removed |Added ---------------------------------------------------------------------------- Resolution|--- |FIXED Status|UNCONFIRMED |RESOLVED
https://bugs.openldap.org/show_bug.cgi?id=10275
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https://bugs.openldap.org/show_bug.cgi?id=10275
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https://bugs.openldap.org/show_bug.cgi?id=10275
Howard Chu hyc@openldap.org changed:
What |Removed |Added ---------------------------------------------------------------------------- Keywords|needs_review | Target Milestone|--- |0.9.33
https://bugs.openldap.org/show_bug.cgi?id=10275
--- Comment #7 from Quanah Gibson-Mount quanah@openldap.org --- • c5f0ac27 by Gary Wicker at 2024-10-26T21:26:17+01:00 ITS#10275 mdb_load: add -Q option to use NOSYNC for faster loading
• 790ed0e9 by Howard Chu at 2024-10-26T21:27:01+01:00 ITS#10275 mdb_load: add -Q option to use NOSYNC for faster loading
https://bugs.openldap.org/show_bug.cgi?id=10275
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https://bugs.openldap.org/show_bug.cgi?id=10275
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