Shulou(Shulou.com)06/03 Report--

Refresh

The operation record in the translog is not purged, and the translog is emptied only after the data is written to disk from the filesystem cache.

Execute refresh manually: call _ refresh to implement memory-> file system caching immediately, so that documents can be searched immediately. # single indexPOST / twitter/_refresh# multiple indexPOST / index01,index02/_refresh# all indexPOST / _ refresh reference figure

Fresh

The process of writing to disk from filesystem cache is flush.

Manual execution of fresh:# single indexPOST / twitter/_fresh# multiple indexPOST / index01,index02/_fresh# all indexPOST / _ fresh conditions for triggering fresh each shard of 1:es performs a flush operation every 30 minutes; 2: when the translog file size is larger than 512MB, flush;3 is initiated: every time index, bulk, delete, update is completed, flush translog is triggered to disk Core configuration item: 1:index.translog.flush_threshold_ops: a flush is performed when many operations occur. The default is unlimited. 2:index.translog.flush_threshold_size: a flush operation occurs when the size of the translog reaches this value. The default is 512mb. 3:index.translog.flush_threshold_period: if no flush operation is performed within the specified time interval, a forced flush operation will be performed. The default is 30m. 4:index.translog.interval: how often will translog be checked to perform a flush operation.

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