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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "bucket_ownership_calculator.h"
#include <vespa/document/bucket/bucket.h>
#include <vespa/vdslib/distribution/distribution.h>
#include <vespa/vdslib/state/clusterstate.h>
namespace storage::distributor {
namespace {
uint64_t superbucket_from_id(const document::BucketId& id, uint16_t distribution_bits) noexcept {
// The n LSBs of the bucket ID contain the superbucket number. Mask off the rest.
return id.getRawId() & ~(UINT64_MAX << distribution_bits);
}
}
bool
BucketOwnershipCalculator::this_distributor_owns_bucket(const document::BucketId& bucket_id) const
{
// TODO "no distributors available" case is the same for _all_ buckets; cache once in constructor.
// TODO "too few bits used" case can be cheaply checked without needing exception
try {
const auto bits = _state.getDistributionBitCount();
const auto this_superbucket = superbucket_from_id(bucket_id, bits);
if (_cached_decision_superbucket == this_superbucket) {
return _cached_owned;
}
uint16_t distributor = _distribution.getIdealDistributorNode(_state, bucket_id, "uim");
_cached_decision_superbucket = this_superbucket;
_cached_owned = (distributor == _this_node_index);
return _cached_owned;
} catch (lib::TooFewBucketBitsInUseException&) {
// Ignore; implicitly not owned
} catch (lib::NoDistributorsAvailableException&) {
// Ignore; implicitly not owned
}
return false;
}
}
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