**BUG REPORT**
1. Please describe the issue you observed:
- What did you do?
build and test build
- What did you expect to see?
all the unit tests passed
- What did you see instead?
```
[ERROR]
testAddFailsWithReadOnlyBookie(org.apache.bookkeeper.client.MdcContextTest)
Time elapsed: 3.92 s <<< ERROR!
java.util.ConcurrentModificationException
at
org.apache.bookkeeper.client.MdcContextTest.assertLogWithMdc(MdcContextTest.java:97)
at
org.apache.bookkeeper.client.MdcContextTest.testAddFailsWithReadOnlyBookie(MdcContextTest.java:195)
```
[ Full content available at: https://github.com/apache/bookkeeper/issues/1696 ]
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