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Translog
editTranslog
editEach shard has a transaction log or write ahead log associated with it. It allows to guarantee that when an index/delete operation occurs, it is applied atomically, while not "committing" the internal Lucene index for each request. A flush ("commit") still happens based on several parameters:
| Setting | Description |
|---|---|
index.translog.flush_threshold_ops |
After how many operations to flush.
Defaults to |
index.translog.flush_threshold_size |
Once the translog hits this size,
a flush will happen. Defaults to |
index.translog.flush_threshold_period |
The period with no flush
happening to force a flush. Defaults to |
index.translog.interval |
How often to check if a flush is needed, randomized
between the interval value and 2x the interval value. Defaults to |
Note: these parameters can be updated at runtime using the Index Settings Update API (for example, these number can be increased when executing bulk updates to support higher TPS)