/**
* Given an Object value, pick a partition to store the data. Currently only String objects can be
* hashed.
*
* @param value The value to hash.
* @param partitionCount The number of partitions to choose from.
* @return A value between 0 and partitionCount-1, hopefully pretty evenly distributed.
*/
static int hashinate(Object value, int partitionCount) {
if (value instanceof String) {
String string = (String) value;
try {
byte bytes[] = string.getBytes("UTF-8");
int hashCode = 0;
int offset = 0;
for (int ii = 0; ii < bytes.length; ii++) {
hashCode = 31 * hashCode + bytes[offset++];
}
return java.lang.Math.abs(hashCode % partitionCount);
} catch (UnsupportedEncodingException e) {
hostLogger.l7dlog(
Level.FATAL,
LogKeys.host_TheHashinator_ExceptionHashingString.name(),
new Object[] {string},
e);
HStore.crashDB();
}
}
hostLogger.l7dlog(
Level.FATAL,
LogKeys.host_TheHashinator_AttemptedToHashinateNonLongOrString.name(),
new Object[] {value.getClass().getName()},
null);
HStore.crashDB();
return -1;
}
@Override
public void faultOccured(VoltFault fault) {
System.err.println("Unrecoverable fault occured: " + fault.toString());
HStore.crashDB();
}