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ok, this bug was hard to find.

Browse source 
hyperloglog.h was missing guards and randomly deleting memory at
addresses equal to variable contents.

I am not entirely sure why that did not crash before...
This commit is contained in:
Bernhard Amann 2013-04-10 13:45:21 -04:00
parent a37ffab0ea
commit 240d667e30
4 changed files with 17 additions and 12 deletions
Download patch file Download diff file Expand all files Collapse all files

5
src/HyperLogLog.cc
View file

@ -18,7 +18,7 @@ int CardinalityCounter::optimalB(double error)
answer++; answer++;
k = pow(2, (answer - initial_estimate)/2); k = pow(2, (answer - initial_estimate)/2);
} }
while (erf(k/sqrt(2)) < conf); while (erf(k/sqrt(2)) < HLL_CONF);
return answer; return answer;
} }
@ -67,9 +67,6 @@ CardinalityCounter :: CardinalityCounter(double error_margin)
CardinalityCounter::~CardinalityCounter() CardinalityCounter::~CardinalityCounter()
{ {
delete [] buckets; delete [] buckets;
delete &m;
delete &V;
delete &alpha_m;
} }
uint8_t CardinalityCounter::rank(uint64_t hash_modified) uint8_t CardinalityCounter::rank(uint64_t hash_modified)

11
src/HyperLogLog.h
View file

@ -1,16 +1,19 @@
// See the file "COPYING" in the main distribution directory for copyright. // See the file "COPYING" in the main distribution directory for copyright.
#ifndef hyperloglog_h
#define hyperloglog_h
#include <stdint.h> #include <stdint.h>
#include <opaqueval.h>
/* /*
* "conf" is how confident the estimate given by the counter is. * "conf" is how confident the estimate given by the counter is.
* *
* In other words, if the cardinality is estimated to be 100 with 2% error margin and conf is * In other words, if the cardinality is estimated to be 100 with 2% error margin and HLL_CONFis
* 0.95, then we are 95% sure that the actual cardinality is between 98 and 102. * 0.95, then we are 95% sure that the actual cardinality is between 98 and 102.
*/ */
#define conf .95 #define HLL_CONF .95
class CardinalityVal;
class CardinalityCounter { class CardinalityCounter {
friend class CardinalityVal; friend class CardinalityVal;
@ -114,3 +117,5 @@ class CardinalityCounter {
*/ */
uint64_t getM(); uint64_t getM();
}; };
#endif

7
src/OpaqueVal.cc
View file

@ -11,14 +11,16 @@ CardinalityVal::CardinalityVal() : OpaqueVal(new OpaqueType("cardinality"))
CardinalityVal::~CardinalityVal() CardinalityVal::~CardinalityVal()
{ {
if ( valid && c ) if ( valid && c != 0 )
delete c; delete c;
c = 0;
valid = false;
} }
IMPLEMENT_SERIAL(CardinalityVal, SER_CARDINALITY_VAL); IMPLEMENT_SERIAL(CardinalityVal, SER_CARDINALITY_VAL);
bool CardinalityVal::DoSerialize(SerialInfo* info) const bool CardinalityVal::DoSerialize(SerialInfo* info) const
{ {
printf("Serializing\n");
DO_SERIALIZE(SER_CARDINALITY_VAL, OpaqueVal); DO_SERIALIZE(SER_CARDINALITY_VAL, OpaqueVal);
if ( ! IsValid() ) if ( ! IsValid() )
@ -39,6 +41,7 @@ bool CardinalityVal::DoSerialize(SerialInfo* info) const
bool CardinalityVal::DoUnserialize(UnserialInfo* info) bool CardinalityVal::DoUnserialize(UnserialInfo* info)
{ {
printf("Unserializing\n");
DO_UNSERIALIZE(OpaqueVal); DO_UNSERIALIZE(OpaqueVal);
if ( ! IsValid() ) if ( ! IsValid() )

4
src/OpaqueVal.h
View file

@ -11,11 +11,11 @@ class CardinalityCounter;
class CardinalityVal: public OpaqueVal { class CardinalityVal: public OpaqueVal {
public: public:
CardinalityVal();
~CardinalityVal();
bool Init(CardinalityCounter*); bool Init(CardinalityCounter*);
bool IsValid() const { return valid; }; bool IsValid() const { return valid; };
CardinalityCounter* Get() { return c; }; CardinalityCounter* Get() { return c; };
CardinalityVal();
~CardinalityVal();
private: private:
bool valid; bool valid;