I was seeing this kind of problem and traced it to when a PutHDFS ran after a MergeContent (also using Docker). It would run fine until it started trying to write the files to HDFS and then the network IO overwhelmed the container (my theory anyway). By using a shorter time interval I was able to get past it (smaller, more frequent file writes). I tried to get the MergeContent to bundle based on max bytes but could never get it working right so I used time-based instead.
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