Apache Accumulo 1.9.3 contains bug fixes for summary of bugs here. Users of any previous version of 1.8 or 1.9 are encouraged to upgrade immediately or specify recommended timeline.
Accumulo maintains a 1-up counter to keep file names and other identifiers unique. This counter is padded with 0 characters when used in file names. If the counter becomes sufficiently large, the padding code in versions prior to 1.9.3 causes an out of bounds error.
Most users will not be affected by this bug, since it requires the counter to be very large before the error would be seen. Situations which might cause the counter to get very large include: having a very old Accumulo cluster that has been running for many years, having a very large cluster, having a cluster that writes many files very quickly for long periods of time, having altered the current value of the counter in ZooKeeper, or if you experience a bug which causes the counter value to skip ahead very rapidly.
If you wish to check to see if you are at risk of being impacted by this bug, examine the name of RFiles recently created in your system. If you have one or more padded 0 characters (after an initial letter), as in I000zy98.rf or I0123abc.rf, you are probably at low risk from this bug.
This issue was fixed in pull request #562
More description here. This was fixed in [#NUM].
View the [Upgrading Accumulo documentation][upgrade] for guidance.
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