Hello John,

We've encountered an issue when using multiple instances of data access
tool over the same data. When multiple instances try to build missing
indexes for some query on the same data, they crash with segfault. The
index is then in an undefined state and further attempts to query the data
result in a crash as well.

The solution is to build the indexes first and use the data as read only
for multiple instances. However, in our use case, this is highly
impractical. Is there any support for concurrent queries which create
indexes on the fly in the FastBit library? Or any kind of locking for this
use case?

Thanks,
Petr
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