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@@ -172,7 +172,7 @@ Then, the files created before or after *T* remain available in HDFS.
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The files deleted before or after *T* remain deleted in HDFS.
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A newer release is downgradable to the pre-upgrade release
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-only if both the namenode layout version and the datenode layout version
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+only if both the namenode layout version and the datanode layout version
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are not changed between these two releases.
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In a HA cluster,
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Arpit Agarwal