2c0aa22e2e
`SimpleDateFormat` is not thread-safe. Some places use the same SimpleDateFormat object without safeguard in the multiple threads. It will cause that the Web UI displays improper date. This PR creates a new `SimpleDateFormat` every time when it's necessary. Another solution is using `ThreadLocal` to store a `SimpleDateFormat` in each thread. If this PR impacts the performance, I can change to the latter one. Author: zsxwing <zsxwing@gmail.com> Closes #179 from zsxwing/SPARK-1278 and squashes the following commits: 21fabd3 [zsxwing] SPARK-1278: Fix improper use of SimpleDateFormat |
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