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That delay reduces the work per unit of time a thread can do, potentially incurring a performance penalty. The default behavior (O_DSYNC enabled) is that pwrite(2) will block the calling thread until the data has been written to the SSD. Until the a write block is persisted to SSD (by default at most 1 second afterīeing written to DRAM), its contents are subject to loss in the event of a system failure (e.g. With the interval bounded by the flush-max-msĬonfiguration parameter. Write blocks are regularly flushed to SSD via Linux pwrite(2) syscalls, The changed record initially resides in a memory buffer on a server node in a structure known as
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Some further details on the effect of this setting: When a database record is written or updated, With data in PMEM, this setting is only relevant for shadow file storage.
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Set conflict-resolution-policy to last-update-time:
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Suited whereas for use cases where the last update is more important to preserve, last-update-time would be more The history of a record (such as lists or maps with items appended on each update) generation may be more For use cases where it is more important to preserve In AP mode ( strong-consistency set to false) network partitionsĬould cause updates to be lost when the cluster re-forms itself.
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Generation value could wrap back to 0 on a record with a high update rate (Max of 65K generation number per Records). For version 3.8.3 and above,Ĭold restart conflict resolution always uses the last-update-time.įor records created prior to 3.8.3, the cold start resolution will fall back to generation.Īlso, in case of equal last-update-time, the tie is broken by generation. This parameter does not impact the cold restart conflict resolution policy. Ttl - Resolve records conflict based on the record's ttl. Last-update-time - Resolve records conflict based on the record's last update time (version 3.8.3 and up). Generation - Resolve records conflict based on the record's generation number. This setting can be set to either last-update-time or generation Set the namespace's compression-level to 1: In Aerospike Server versions 4.6.x or newer, if this setting has never been specified when using compression zstd,Ī default flag of 9 is displayed and the compression-level of 9 will be used.īelong to a namespace's storage-engine section. In Aerospike Server versions prior to 4.6.x, if this setting has never been specified when using compression zstd,Ī default flag of 0 is displayed and the compression-level of 9 will be used. Note that this item should only be specified when using compression zstd. Controls the trade-off between compression speed and compression ratio.Ī higher level value, for example 9, means more efficient but slower compression.Ī lower level value, for example 1, means less efficient but faster compression. The compression level to use with zstd compression. Not XDR compression-level for dc namespace. If you want to keep the same cup size, but need another band size? Just go down or up a cup size as well to keep the same cup volume.Note: this is compression-level for storage-engine,
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