Issue #1550: remove multiple isFiltered invocations
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ppkarwasz
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Async logger configs call `isFiltered(LogEvent)` multiple times. While this is not a problem per-se, it can cause a performance penalty if the filter is slow and creates problems to stateful filters.
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jonatan-ivanov
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Oct 20, 2023
In case of async loggers, the MetricsFilter#filter method is/was called multiple times. Because of this, a check was introduced in gh-2183 assuming that if the event has the isEndOfBatch flag set to true, that is the last filter method call for that event. Unfortunately, it turned out that this approach did not work, since it did not just filter out the unwanted multiple calls on one event but it also filtered out all the filter method calls on events that were not at the end of the async batch. So Log4j2Metrics counted batches of events, not the individual events. Fortunately multiple filter invocations was fixed in Log4j2, see apache/logging-log4j2#1550 and apache/logging-log4j2#1552. Since now there will be only one filter method call, the check introduced in gh-2183 can and should be removed (the call to the filter method is before the isEndOfBatch flag is set so the flag will always return false). Closes gh-2176 See gh-2183 See gh-4253
jonatan-ivanov
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Oct 20, 2023
In case of async loggers, the MetricsFilter#filter method is/was called multiple times. Because of this, a check was introduced in gh-2183 assuming that if the event has the isEndOfBatch flag set to true, that is the last filter method call for that event. Unfortunately, it turned out that this approach did not work, since it did not just filter out the unwanted multiple calls on one event but it also filtered out all the filter method calls on events that were not at the end of the async batch. So Log4j2Metrics counted batches of events, not the individual events. Fortunately multiple filter invocations was fixed in Log4j2, see apache/logging-log4j2#1550 and apache/logging-log4j2#1552. Since now there will be only one filter method call, the check introduced in gh-2183 can and should be removed (the call to the filter method is before the isEndOfBatch flag is set so the flag will always return false). Closes gh-2176 See gh-2183 See gh-4253
jonatan-ivanov
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that referenced
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Oct 20, 2023
In case of async loggers, the MetricsFilter#filter method is/was called multiple times. Because of this, a check was introduced in gh-2183 assuming that if the event has the isEndOfBatch flag set to true, that is the last filter method call for that event. Unfortunately, it turned out that this approach did not work, since it did not just filter out the unwanted multiple calls on one event but it also filtered out all the filter method calls on events that were not at the end of the async batch. So Log4j2Metrics counted batches of events, not the individual events. Fortunately multiple filter invocations was fixed in Log4j2, see apache/logging-log4j2#1550 and apache/logging-log4j2#1552. Since now there will be only one filter method call, the check introduced in gh-2183 can and should be removed (the call to the filter method is before the isEndOfBatch flag is set so the flag will always return false). Closes gh-2176 See gh-2183 See gh-4253
jonatan-ivanov
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to micrometer-metrics/micrometer
that referenced
this pull request
Oct 25, 2023
In case of async loggers, the MetricsFilter#filter method is/was called multiple times. Because of this, a check was introduced in gh-2183 assuming that if the event has the isEndOfBatch flag set to true, that is the last filter method call for that event. Unfortunately, it turned out that this approach did not work, since it did not just filter out the unwanted multiple calls on one event but it also filtered out all the filter method calls on events that were not at the end of the async batch. So Log4j2Metrics counted batches of events, not the individual events. Fortunately multiple filter invocations was fixed in Log4j2, see apache/logging-log4j2#1550 and apache/logging-log4j2#1552. Since now there will be only one filter method call, the check introduced in gh-2183 can and should be removed (the call to the filter method is before the isEndOfBatch flag is set so the flag will always return false). Closes gh-2176 See gh-2183 See gh-4253
jonatan-ivanov
added a commit
to micrometer-metrics/micrometer
that referenced
this pull request
Oct 25, 2023
In case of async loggers, the MetricsFilter#filter method is/was called multiple times. Because of this, a check was introduced in gh-2183 assuming that if the event has the isEndOfBatch flag set to true, that is the last filter method call for that event. Unfortunately, it turned out that this approach did not work, since it did not just filter out the unwanted multiple calls on one event but it also filtered out all the filter method calls on events that were not at the end of the async batch. So Log4j2Metrics counted batches of events, not the individual events. Fortunately multiple filter invocations was fixed in Log4j2, see apache/logging-log4j2#1550 and apache/logging-log4j2#1552. Since now there will be only one filter method call, the check introduced in gh-2183 can and should be removed (the call to the filter method is before the isEndOfBatch flag is set so the flag will always return false). Closes gh-2176 See gh-2183 See gh-4253
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Async logger configs call
isFiltered(LogEvent)multiple times. While this is not a problem per-se, it can cause a performance penalty if the filter is slow and creates problems to stateful filters.This PR reduces the number of
isFiltered(LogEvent)calls to one and closes #1550.Remark: this PR changes the public API by increasing the visibility of
LoggerConfig#processLogEventtoprotected.