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docs/CHANGELOG.md: document atomic directory deletion

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Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3038
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Aliaksandr Valialkin 2022-09-13 16:03:12 +03:00
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@ -18,6 +18,7 @@ The following tip changes can be tested by building VictoriaMetrics components f
**Update note:** this release changes data format for [/api/v1/export/native](https://docs.victoriametrics.com/#how-to-export-data-in-native-format) in incompatible way, so it cannot be imported into older version of VictoriaMetrics via [/api/v1/import/native](https://docs.victoriametrics.com/#how-to-import-data-in-native-format).
* FEATURE: check the correctess of raw sample timestamps stored on disk when reading them. This reduces the probability of possible silent corruption of the data stored on disk. This should help [this](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/2998) and [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3011).
* FEATURE: atomically delete directories with snapshots, parts and partitions at [storage level](https://docs.victoriametrics.com/#storage). Previously such directories can be left in partially deleted state when the deletion operation was interrupted by unclean shutdown. This may result in `cannot open file ...: no such file or directory` error on the next start. The probability of this error was quite high when NFS or EFS was used as persistent storage for VictoriaMetrics data. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3038).
* FEATURE: set the `start` arg to `end - 5 minutes` if isn't passed explicitly to [/api/v1/labels](https://docs.victoriametrics.com/url-examples.html#apiv1labels) and [/api/v1/label/.../values](https://docs.victoriametrics.com/url-examples.html#apiv1labelvalues). See [this pull request](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/3052).
* FEATURE: [vmctl](https://docs.victoriametrics.com/vmctl.html): add `vm-native-step-interval` command line flag for `vm-native` mode. New option allows splitting the import process into chunks by time interval. This helps migrating data sets with high churn rate and provides better control over the process. See [feature request](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/2733).
* FEATURE: [vmui](https://docs.victoriametrics.com/#vmui): add `top queries` tab, which shows various stats for recently executed queries. See [these docs](https://docs.victoriametrics.com/#top-queries) and [this feature request](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/2707).