- **status**: assigned --> review
---
** [tickets:#770] CKPT service performance enhancements**
**Status:** review
**Milestone:** future
**Created:** Thu Feb 06, 2014 07:01 PM UTC by Alex Jones
**Last Updated:** Tue Apr 29, 2014 06:05 PM UTC
**Owner:** Alex Jones
The checkpoint service has some major performance problems when using a lot of
sections (greater than 5k).
Attached is a patch which addresses the following problems:
1) section id database is implemented as a linked list, so searching for a
section id takes a long time (make it a C++ STL map)
2) MAX_SYNC_TRANSFER_SIZE is too large, and causes MDS timeouts
3) SectionCreate message should be asynchronous when ACTIVE_REPLICA is specified
There is still one more problem that I haven't delved into yet.
When there are 5 active checkpoints in the cluster, each with 40k sections and
1k worth of data in each section, and a standby node opens all of them (200k
total sections), and iterates through all of them, while those checkpoints are
being actively written, it takes on average 15 seconds to iterate through each
checkpoint, and sometimes the iteration function returns TIMEOUT. Hopefully,
this can be improved.
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