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Use binary search in ShardBoundaries#getShardForToken #1792

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Use binary search in ShardBoundaries#getShardForToken #1792

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11 changes: 5 additions & 6 deletions src/java/org/apache/cassandra/db/memtable/ShardBoundaries.java
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Original file line number Diff line number Diff line change
Expand Up @@ -68,12 +68,11 @@ public ShardBoundaries(List<Token> boundaries, long ringVersion)
*/
public int getShardForToken(Token tk)
{
for (int i = 0; i < boundaries.length; i++)
{
if (tk.compareTo(boundaries[i]) <= 0) // boundaries are end-inclusive
return i;
}
return boundaries.length;
int idx = Arrays.binarySearch(boundaries, tk);
// boundaries are end-inclusive, so an exact match is the correct shard
if (idx >= 0)
return idx;
return -idx - 1;
}

/**
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