Fix ConcurrentModificationException in IncrementalPublishingKafkaIndexTaskRunner#5907
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gianm merged 2 commits intoapache:masterfrom Jul 1, 2018
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Fix ConcurrentModificationException in IncrementalPublishingKafkaIndexTaskRunner#5907gianm merged 2 commits intoapache:masterfrom
gianm merged 2 commits intoapache:masterfrom
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gianm
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Jun 28, 2018
| private final String sequenceName; | ||
| private final Map<Integer, Long> startOffsets; | ||
| private final Map<Integer, Long> endOffsets; | ||
| private final ConcurrentHashMap<Integer, Long> endOffsets; |
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Please include a comment that explains two things:
- why this is a
ConcurrentHashMap - who is allowed to modify it (do you need to be a specific thread or acquire a specific lock)? I bet that if multiple threads modify this concurrently then unexpected things will happen.
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Well, the problem is that setEndOffsets() can be called by both the main thread and the http thread. Actually setEndOffsets() also sets checkpointed variable too, so I changed to acquire a lock before modifying endOffsets and checkpointed variables.
I bet that if multiple threads modify this concurrently then unexpected things will happen.
I have no idea about this.
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…xTaskRunner (apache#5907) * Fix ConcurrentModificationException in IncrementalPublishingKafkaIndexTaskRunner * fix lock and add comments
gianm
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…xTaskRunner (apache#5907) Ported without cherry-pick, since the original commit depends on the patch that splits KafkaIndexTask.
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…xTaskRunner (apache#5907) Ported without cherry-pick, since the original commit depends on the patch that splits KafkaIndexTask.
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Fixes #5745.
This change is