[HADOOP-9857] Tests block and sometimes timeout on Windows due to invalid entropy source.

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.1.1-beta, 3.0.0-alpha1
• Fix Version/s: 2.1.1-beta
• Component/s: build, test
• Target Version/s: 2.1.1-beta
• Hadoop Flags: Reviewed
• Assignee: Chris Nauroth
• Reporter: Chris Nauroth
• Created: 09/Aug/13 18:55
• Updated: 12/May/16 18:21
• Resolved: 09/Aug/13 23:06

Description

Tests are configured to set the entropy source to file:///dev/urandom to prevent blocking on machines with low entropy. We've observed that on Windows, this will cause tests to block for 5 seconds trying to access this non-existent path the first time the process does something that needs entropy, such as using a SecureRandom or creating a UUID. This can cause tests to fail due to timeouts. In addition to the initial 5-second blocking, this causes the JVM to fall back to a slower, non-native seed generation implementation.

Issue Links

• relates to: HADOOP-7335 Force entropy to come from non-true random for tests
• relates to: HADOOP-9688 Add globally unique Client ID to RPC requests
• relates to: HADOOP-7841 Run tests with non-secure random