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Diffstat (limited to 'docs/reference/index-modules/translog.asciidoc')
| -rw-r--r-- | docs/reference/index-modules/translog.asciidoc | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/docs/reference/index-modules/translog.asciidoc b/docs/reference/index-modules/translog.asciidoc new file mode 100644 index 0000000..e5215fe --- /dev/null +++ b/docs/reference/index-modules/translog.asciidoc @@ -0,0 +1,28 @@ +[[index-modules-translog]] +== Translog + +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: + +[cols="<,<",options="header",] +|======================================================================= +|Setting |Description +|index.translog.flush_threshold_ops |After how many operations to flush. +Defaults to `5000`. + +|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`. +|======================================================================= + +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) |