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WARNING: Version 1.3 of Elasticsearch has passed its EOL date.

This documentation is no longer being maintained and may be removed. If you are running this version, we strongly advise you to upgrade. For the latest information, see the current release documentation.

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Elastic Docs ›Elasticsearch Guide [1.3] ›Index Modules

Translog

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Translog

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Each 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:

index.translog.flush_threshold_ops
After how many operations to flush. Defaults to unlimited.
index.translog.flush_threshold_size
Once the translog hits this size, a flush will happen. Defaults to 200mb.
index.translog.flush_threshold_period
The period with no flush happening to force a flush. Defaults to 30m.
index.translog.interval
How often to check if a flush is needed, randomized between the interval value and 2x the interval value. Defaults to 5s.
index.gateway.local.sync
How often the translog is fsynced to disk. Defaults to 5s.

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)

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