[Backport] Fix races in LookupSnapshotTaker, CoordinatorPollingBasicAuthenticato…#5360
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jon-wei merged 1 commit intoapache:0.12.0from Feb 7, 2018
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…rCacheManager (apache#5344) * Fix races in LookupSnapshotTaker, CoordinatorPollingBasicAuthenticatorCacheManager. Both were susceptible to the following conditions: 1. Two JVMs on the same machine (perhaps two peons) could conflict by one reading while the other was writing, or by writing to the file at the same time. 2. One JVM could partially write a file, then crash, leaving a truncated file. * Use StringUtils.format
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Backport of #5344 to 0.12.0