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spotify / cassandra-reaper

Software to run automated repairs of cassandra
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Arithmetic Exception, division by 0 #109

Closed djsly closed 6 years ago

djsly commented 9 years ago 
  public static int getPossibleParallelRepairsCount(Map<List<String>, List<String>> ranges)
      throws ReaperException {
    if (ranges.size() == 0) {
      String msg = "Repairing 0-sized cluster.";
      LOG.error(msg);
      throw new ReaperException(msg);
    }
    return ranges.size() / ranges.values().iterator().next().size();
  }

my ranges contains no values (no endPoint), how would that be possible ? I'm not super familiar with Cassandra's internal.

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1775046580520098842]=[], [-7837449111407677059, -7835533857396313744]=[], [3608126377440011913, 3631763644187782196]=[], [1707987676098870457, 1715278190568603790]=[], [1262100321431177247, 1282693436558994280]=[], [-4238320399166945720, -4231722489526295728]=[], [-3527036946169677816, -3517969055276438922]=[], [186748954390194875, 212371013041908784]=[], [-3054876837884326554, -3047569376577333773]=[], [-1603482665970338357, -1586132657391656566]=[], [6482788915242085216, 6491980926278450301]=[], [-109575287580986427, -95112322885815284]=[], [-7835533857396313744, -7813710847714650905]=[], [5515671905275458960, 5528493110189420233]=[], [-8332208069486211233, -8322828368529916204]=[], [870287520923088409, 906880799052678148]=[], [-5906296738643732553, -5898911102407369534]=[], [-1154549854382614947, -1152130983607815360]=[], [-853787615013518331, -853561760424292496]=[], [8740747575121493913, 8744383075276610422]=[], [8536024164660715472, 8581577728470934773]=[], [-6099801613660131827, 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[155208214722633207, 183029690912963010]=[], [-4698430307027007341, -4671341321902941796]=[], [7355598039...
djsly commented 9 years ago

Turns out that my replication DC name was wrong when I setup my keyspace. so Cassandra was returning a list of empty listen addresses (end point)

I will let you decide if you prefer to have a better error message in case .values() returns 0. Right now it keeps the repair Run in the Running state for ever due to the aricmetic exception.

chbatey commented 8 years ago

Also hit this. Going to raise a PR to wrap this up in a reaper exception and give a better log message.