1. Your system is overloaded. You are asking it to do too much. Also, you're probably reacting to single snapshot - every process takes it in turn to sleep awaiting its turn on the CPU, if it's not waiting for something else such as disk I/O requests. In fact, there can be no more than N processes actually executing at any one time if you have N CPUs or CPU-equivalents.
2. You have not checked thoroughly enough. Somehow, somewhere, your data contains eight columns and your metadata only four. Find it, perhaps using the debugger, and fix it.
problem with environment setting
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