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Surviving SQS and building B-link Trees on S3As mentioned above, to bypass the severe latency of writing full data pages directly to S3, clients commit transactions by shipping small redo log records to SQS queues. Subsequently, clients act as checkpointers, asynchronously pulling these queued logs and applying the updates to their local copies before writing the newly materialized B-tree pages back to S3. This asynchronous log-shipping model means B-tree pages on S3 can be arbitrarily out-of-date compared to the real-time logs in SQS. Working on such stale state seems impossible, but the authors bound the staleness: writers (and probabilistically readers) run asynchronous checkpoints that pull batches of logs from SQS and apply them to S3, keeping the database consistent despite delays.，推荐阅读PDF资料获取更多信息
The narrow, 104-mile strait is the main choke point separating the Persian Gulf—and the daily flow of nearly 20 million barrels of oil—from the Indian Ocean and global energy markets. Nearly 20% of global oil and natural gas exports flow through the strait each day—until now. Saudi Arabia, Iraq, Iran, Kuwait, Qatar, and the United Arab Emirates all depend on the waterway for their exports.，更多细节参见纸飞机下载
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