Merge pull request #7786 from influxdata/mr-cache-decrease-size
Use one atomic operation in (*Cache).decreaseSizepull/7646/head
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153277c01d
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@ -24,6 +24,7 @@ The stress tool `influx_stress` will be removed in a subsequent release. We reco
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### Bugfixes
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- [#7786](https://github.com/influxdata/influxdb/pull/7786): Fix potential race condition in correctness of tsm1_cache memBytes statistic.
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- [#7784](https://github.com/influxdata/influxdb/pull/7784): Fix broken error return on meta client's UpdateUser and DropContinuousQuery methods.
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- [#7741](https://github.com/influxdata/influxdb/pull/7741): Fix string quoting and significantly improve performance of `influx_inspect export`.
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- [#7698](https://github.com/influxdata/influxdb/pull/7698): CLI was caching db/rp for insert into statements.
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@ -425,8 +425,8 @@ func (c *Cache) increaseSize(delta uint64) {
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// decreaseSize decreases size by delta.
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func (c *Cache) decreaseSize(delta uint64) {
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size := atomic.LoadUint64(&c.size)
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atomic.StoreUint64(&c.size, size-delta)
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// Per sync/atomic docs, bit-flip delta minus one to perform subtraction within AddUint64.
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atomic.AddUint64(&c.size, ^(delta - 1))
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}
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// MaxSize returns the maximum number of bytes the cache may consume.
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