This is because the metadata api doesn't support get topics matching a regular expression.
For an offset to move, all replicas must have received the message on that offset. Otherwise, the tool just keeps retrying.
Not sure what your question is. Each fetch thread does the following in a loop:
1. fetch from the broker
2. wait for all threads to finish fetching
3. wait for verification to complete (only one threads does the verification)
The verification barrier is used so that all fetcher threads are in the right state in step 1.
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On Nov. 11, 2013, 4:44 p.m., Jun Rao wrote: