Almost all catastrophic failures (48 in total, or 92%) are the result of incorrect handling of nonfatal errors explicitly signaled in software;
Error handlers with TODO or FIXME in the comments. This example took down a 4,000-node production cluster; and
Error handlers that catch an abstract exception type (for example, Exception or Throwable in Java) and then take drastic action such as aborting the system. This example brought down a whole Hadoop Distributed File System (HDFS) cluster.
And the list went on from there.
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