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Why Multiwal Is Needed? |
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Answer» With a single WAL per REGIONSERVER, the RegionServer must write to the WAL SERIALLY, because HDFS files must be SEQUENTIAL. This causes the WAL to be a performance bottleneck. With a single WAL per RegionServer, the RegionServer must write to the WAL serially, because HDFS files must be sequential. This causes the WAL to be a performance bottleneck. |
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