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Summary, limitations and performance
Persistence files
Ignite with enabled persistence uses following folder stucture
Consistent ID may be configured using IgniteConfiguration or generated from local IPs set
There are following file types used for persisting data: Cache pages or page store, Checkpoint markers, and WAL segments
- WAL segments - constant size file (WAL work directory 0...9.wal;, WAL archive 0.wal…)
- CP markers (UUID-Begin.bin, UUID-End.bin)
- Page store (Now implemented as uses file per partition: cache-(cache_name)\part1,2,3.bin, and index.bin)
Consistent state comes only from pair of WAL and page store.
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Implementation | Waranny | |
|---|---|---|
| DEFAULT | fsync() on each commit | Any crashes (OS and process crash) |
| LOG_ONY | write() on commit Synchronisation is responsibility of OS | Kill process, but no OS fail |
| BACKGROUND | do nothing on commit (records are accumulated in memory) write() on timeout | kill -9 may cause loss of several latest updates |
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