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We can see the one real redundancy example in the following picture. (I just highlight only one segment.)
Whenthere is no requirement for real-time analytics based on remote storage directly. It has the following drawbacks:
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public static final String REMOTE_COPY_LAG_MS_CONFIG = "remote.copy.lag.ms"; public static final String REMOTE_COPY_LAG_MS_DOC = "Controls how long to delay uploading segments to remote storage. " + "When set to 0 (default), segmentsimmediate areupload uploadedwithout asany soondelay ascheck. they" are+ eligible (no delay check). " + "When set to a positive value (ms), a segment can't become eligible for upload utiluntil the time since the latest record in the segment reaches the value. " + "The value should not exceed the real local retention ms except the latter is retained save foreverindefinitely (-1). " + "When set to -1, resolves to the real local retention ms (maximum delay, or no delay check when the retention is save forever)as maximum delay. " + "For how the real local retention time is computed, see <code>local.retention.ms</code>."; public static final String REMOTE_COPY_LAG_BYTES_CONFIG = "remote.copy.lag.bytes"; public static final String REMOTE_COPY_LAG_BYTES_DOC = "Controls size-based delay for uploading segments to remote storage. " + "When set to 0 (default), segmentsimmediate areupload uploaded as soon as they are eligible (nowithout any delay check). " + "When set to a positive value (bytes), a segment can't become eligible for upload utiluntil the total bytes of log data after the segment reach the value. " + "The value should not exceed the real local retention bytes except the latter is retained save foreverindefinitely (-1). " + "When set to -1, resolves to the real local retention bytes as (maximum delay, or no delay check when the retention is save forever). " + "For how the real local retention size is computed, see <code>local.retention.bytes</code>."; |
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public static final String LOG_REMOTE_COPY_LAG_MS_PROP = "log.remote.copy.lag.ms"; public static final String LOG_REMOTE_COPY_LAG_BYTES_PROP = "log.remote.copy.lag.bytes"; |
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We can use follow tests to cover the change:
Type\Configure | Case Id | local retention time | local retention size | lag time | lag size | Expect result |
Notes |
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0
-1
-1
1 day
1 GB
3 day
-1
0
0
-1
-1
1 day
1 GB
-1
3 GB
0
0
Special cases which can help to understand the basic rule for code review
| 1 | * | * | 0 (default value) | * | No lag | |
2 | * | * | * | 0 (default value) | No lag | ||
3 | * | -1 | * | -1 | No delay check on size. check the time configure as final result | For the case: 4 configures are -1. The final result is not upload. | |
4 | -1 | * | -1 | * | No delay check on time. check the size configure as final result | ||
Typical user cases which can test with deployment
| 5 | 7 days
| -1
| 0 (default value) | 0 (default value) | No lag | 7days + No size limit is If you want time lag delay. you need to set time lag to real value and size lag to -1 |
1 day | -1 | lag: 1 day | |||||
-1 | -1 | lag: 7 days | |||||
6 | -1 | 3 GB | 0 (default value) | 0 (default value) | No lag | ||
-1 | 1 GB | lag: 1 GB | |||||
-1 | -1 | lag: 3 GB | |||||
7 | 7 days | 3 GB | 0 (default value) | 0 (default value) | No lag |
-1
-1
1 day | 1 GB | lag: 1 day |
| or 1 GB |
3 day
3 GB
0
0
-1 | -1 | lag: |
| 7 days or 3 GB | |||
8 | 7 days | 3 GB | 1 day |
0 (default value) | No lag |
Unit Tests:
- Test upload eligibility logic with different configure values
- Test configuration validation for topic
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