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service_log.cpp
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service_log.cpp
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#include "service_common.h"
#ifdef HAVE_SWITCH
#include <switch_algorithms.h>
#endif
#include <sys/types.h>
#include <dirent.h>
int Rename(const char *oldpath, const char *newpath);
int Unlink(const char *pathname);
uint32_t Service::verify_log(int fd) {
const auto fileSize = lseek64(fd, 0, SEEK_END);
if (!fileSize) {
return 0;
}
auto *const fileData = mmap(nullptr, fileSize, PROT_READ, MAP_SHARED, fd, 0);
strwlen8_t key;
strwlen32_t msgContent;
IOBuffer cb;
range_base<const uint8_t *, size_t> msgSetContent;
uint64_t msgSeqNum{1}, firstMsgSeqNum, lastMsgSeqNum;
static constexpr bool trace{false};
if (fileData == MAP_FAILED) {
throw Switch::system_error("Unable to mmap():", strerror(errno));
}
DEFER(
{
madvise(fileData, fileSize, MADV_DONTNEED);
munmap(fileData, fileSize);
});
madvise(fileData, fileSize, MADV_SEQUENTIAL | MADV_DONTDUMP);
for (const auto *p = static_cast<uint8_t *>(fileData), *const e = p + fileSize, *const base = p; p != e;) {
const auto *const bundleBase = p;
const auto bundleLen = Compression::decode_varuint32(p);
const auto nextBundle = p + bundleLen;
TANK_EXPECT(p < e);
TANK_EXPECT(bundleLen);
const auto bundleFlags = *p++;
const auto codec = bundleFlags & 3;
const bool sparseBundleBitSet = bundleFlags & (1u << 6);
const auto msgsSetSize = ((bundleFlags >> 2) & 0xf) ?: Compression::decode_varuint32(p);
if (trace) {
SLog("Bundle, flags = ", bundleFlags, ", codec = ", codec, ", sparseBundleBitSet = ", sparseBundleBitSet, ", msgsSetSize = ", msgsSetSize, "\n");
}
if (sparseBundleBitSet) {
firstMsgSeqNum = decode_pod<uint64_t>(p);
if (msgsSetSize != 1) {
lastMsgSeqNum = firstMsgSeqNum + Compression::decode_varuint32(p) + 1;
} else {
lastMsgSeqNum = firstMsgSeqNum;
}
if (trace) {
SLog("sparse bundle - firstMsgSeqNum = ", firstMsgSeqNum, ", lastMsgSeqNum = ", lastMsgSeqNum, "\n");
}
TANK_EXPECT(firstMsgSeqNum && lastMsgSeqNum >= firstMsgSeqNum);
}
TANK_EXPECT(p <= e);
TANK_EXPECT(msgsSetSize);
TANK_EXPECT(codec == 0 || codec == 1);
if (false) {
Print(msgSeqNum, " => OFFSET ", bundleBase - base, "\n");
}
if (codec) {
cb.clear();
if (!Compression::UnCompress(Compression::Algo::SNAPPY, p, nextBundle - p, &cb)) {
throw Switch::system_error("Failed to decompress content");
}
msgSetContent.set(reinterpret_cast<uint8_t *>(cb.data()), cb.size());
} else {
msgSetContent.set(p, nextBundle - p);
}
[[maybe_unused]] uint64_t msgTs{0};
uint32_t msgIdx{0};
for (const auto *p = msgSetContent.offset, *const e = p + msgSetContent.len; p != e; ++msgIdx, ++msgSeqNum) {
// Next message set message
const auto flags = *p++;
if (sparseBundleBitSet) {
if (msgIdx == 0 || msgIdx == msgsSetSize - 1) {
msgSeqNum = firstMsgSeqNum;
} else if (msgIdx == msgsSetSize - 1) {
msgSeqNum = lastMsgSeqNum;
} else if (flags & uint8_t(TankFlags::BundleMsgFlags::SeqNumPrevPlusOne)) {
// incremented in for()
} else {
// delta from prev - 1
msgSeqNum += Compression::decode_varuint32(p);
}
}
if (!(flags & uint8_t(TankFlags::BundleMsgFlags::UseLastSpecifiedTS))) {
msgTs = decode_pod<uint64_t>(p);
}
if (flags & uint8_t(TankFlags::BundleMsgFlags::HaveKey)) {
key.set(reinterpret_cast<const char *>(p) + 1, *p);
p += key.size() + sizeof(uint8_t);
} else {
key.reset();
}
const auto msgLen = Compression::decode_varuint32(p);
msgContent.set(reinterpret_cast<const char *>(p), msgLen);
p += msgLen;
if (trace) {
Print("MSG:", msgSeqNum, ", size = ", msgLen, "\n");
}
}
p = nextBundle;
TANK_EXPECT(p <= e);
}
return msgSeqNum;
}
bool Service::close_partition_log(topic_partition *partition) {
static constexpr bool trace{false};
TANK_EXPECT(partition);
auto log = partition->_log.get();
// need to make sure we are no longer tracking this
if (partition->access.ll.try_detach_and_reset() && active_partitions.empty()) {
next_active_partitions_check = std::numeric_limits<uint64_t>::max();
}
if (!log) {
// already closed
// we shouldn't ever reach this path, but we may as well account for it
return false;
}
if (log->compacting.load()) {
// can't touch this while a compaction is on-going
// XXX: may need to use CAS to set this to some other magic value
// so that we won't be attempting to compacting them while its closed
// i.e tri-state(open, close, open-compacting)
return false;
}
auto topic = partition->owner;
TANK_EXPECT(topic);
if (trace) {
SLog(ansifmt::bold, ansifmt::color_green, ansifmt::inverse, "closing PARTITION ", topic->name(), "/", partition->idx, ansifmt::reset, "\n");
}
partition->_log.reset(nullptr);
if (std::exchange(partition->open_ok, false)) {
--total_open_partitions;
}
return true;
}
int Service::reset_partition_log(topic_partition *partition) {
[[maybe_unused]] static constexpr bool trace{false};
TANK_EXPECT(partition);
const auto topic = partition->owner;
TANK_EXPECT(topic);
TANK_EXPECT(!partition->_log); // log must be closed or not opened
TANK_EXPECT(partition->access.ll.empty());
if (partition->flags & unsigned(topic_partition::Flags::NoDataFiles)) {
// there is nothing to do here
return 0;
}
TANK_EXPECT(false == read_only);
char basePath[PATH_MAX];
const auto basePathLen = snprintf(basePath, sizeof(basePath), "%.*s/%.*s/%u/",
static_cast<int>(::basePath_.size()), ::basePath_.data(),
static_cast<int>(topic->name_.size()),
topic->name_.data(), partition->idx);
try {
for (auto name : DirectoryEntries(basePath)) {
if (name.front() == '.') {
continue;
}
TANK_EXPECT(false == read_only);
name.ToCString(basePath + basePathLen);
if (-1 == unlink(basePath)) {
Print("Failed to unlink(", basePath, "): ", strerror(errno), "\n");
return 1;
}
}
} catch (...) {
// maybe gone anyway
}
partition->flags |= unsigned(topic_partition::Flags::NoDataFiles);
return 0;
}
void Service::open_partition_log(topic_partition *partition, const partition_config &conf) {
enum {
trace = false,
};
const auto before = Timings::Microseconds::Tick();
char basePath[PATH_MAX];
auto topic = partition->owner;
auto out = basePath;
out = basePath_.as_s32().CopyTo(out);
*out++ = '/';
if (topic->flags & unsigned(topic::Flags::under_construction)) {
*out++ = '.';
}
out = topic->name_.CopyTo(out);
*(out++) = '/';
const auto topic_path_len = std::distance(basePath, out);
#ifdef HAVE_SWITCH
out += SwitchAlgorithms::U32ToASCII(partition->idx, out);
#else
out += sprintf(out, "%u", partition->idx);
#endif
*(out++) = '/';
const auto full_path_len = std::distance(basePath, out);
*out = '\0'; // make sure its null terminated or there be dragons
TANK_EXPECT(not partition->_log); // already initialized?
track_accessed_partition(partition, curTime);
if (trace) {
puts("");
SLog(ansifmt::bold, ansifmt::color_green, ansifmt::inverse, "OPENING PARTITION ", topic->name(),
"/", partition->idx, " ", ptr_repr(this), ", basePath:[", basePath, ']', ansifmt::reset, "\n");
puts("");
}
const auto __before = Timings::Milliseconds::Tick();
DEFER({
open_partitions_time += Timings::Milliseconds::Since(__before);
});
try {
struct rosegment_ctx final {
uint64_t firstAvailableSeqNum;
uint64_t lastAvailSeqNum;
uint32_t creationTS;
};
// TODO(markp): reuse roLogs, wideEntyRoLogIndices, swapped and the allocator
std::vector<rosegment_ctx> roLogs;
std::unordered_set<uint64_t> wideEntyRoLogIndices;
simple_allocator allocator{1024};
std::vector<strwlen32_t> swapped;
uint64_t curLogSeqNum{0};
uint32_t curLogCreateTS{0};
const strwlen32_t b(basePath, full_path_len);
int fd;
bool processSwapped{true};
struct stat st;
char _base_path[PATH_MAX];
auto l = new topic_partition_log();
bool any_files{false};
l->partition = partition;
l->config = conf;
partition->_log.reset(l);
l->roSegments = nullptr;
l->cur.index.ondisk.data = nullptr;
l->cur.index.ondisk.span = 0;
l->cur.index.haveWideEntries = false;
l->cur.index.ondisk.lastRecorded.relSeqNum = 0;
l->cur.index.ondisk.lastRecorded.absPhysical = 0;
*b.CopyTo(_base_path) = '\0';
// Scan the partitiond directory
// UPDATE: 2021-10-14
// the topic and topic/partition directories may not be created yet(because we are
// creating them lazily) so we need to create them if they are missing
//
// This helps a lot with performance/resources (e.g inodes) for even
// if we create a million of topics or partitions, and we only ever access a few
// only those few partitions directories will be created
const auto dtor = [](DIR *const dh) {
if (dh) {
::closedir(dh);
}
};
std::unique_ptr<DIR, decltype(dtor)> _dir(nullptr, dtor);
_dir.reset(::opendir(basePath));
if (not _dir) {
// try creating the partition directory and if that fails, try the topic and then the partition again
const auto se = errno;
if (trace) {
SLog("Failed to opendir(", basePath, "):", strerror(se), "\n");
}
if (ENOENT == se) {
// try to create the partition first
if (-1 == mkdir(basePath, 0775)) {
const auto se = errno;
if (trace) {
SLog("Failed to mkdir(", basePath, "):", strerror(se), "\n");
}
if (ENOENT != errno) {
goto io_error;
}
// create the topic and then try the partition again
basePath[topic_path_len - 1] = '\0';
if (-1 == mkdir(basePath, 0775)) {
const auto se = errno;
if (trace) {
SLog("Failed to mkdir(", basePath, "):", strerror(se), "\n");
}
if (ENOENT != se) {
goto io_error;
}
}
basePath[topic_path_len - 1] = '/';
if (-1 == mkdir(basePath, 0775)) {
const auto se = errno;
if (trace) {
SLog("Failed to mkdir(", basePath, "):", strerror(se), "\n");
}
if (EEXIST != se) {
goto io_error;
}
}
}
_dir.reset(::opendir(basePath));
if (not _dir) {
if (trace) {
SLog("opendir(", basePath, ") failed:", strerror(errno), "\n");
}
goto io_error;
}
if (trace) {
SLog("opendir(", basePath, ") successful\n");
}
} else {
io_error:
IMPLEMENT_ME();
}
}
for (auto it = readdir(_dir.get()); it; it = readdir(_dir.get())) {
const auto name = str_view32(it->d_name, strlen(it->d_name));
if (name.front() == '.') {
continue;
}
any_files = true;
if (not cluster_aware() and name.Eq(_S("config"))) {
// override
parse_partition_config(Buffer::build(basePath, "/", name).data(), &l->config);
continue;
}
auto r = name.divided('.');
if (r.second.StripSuffix(_S(".cleaned"))) {
// Compaction failed mid-way
// remove this file and make sure any .swap file files are also deleted
auto fullPath = Buffer::build(basePath, "/", name);
if (Unlink(fullPath.data()) == -1) {
throw Switch::system_error("Failed to Unlink(", fullPath, "):", strerror(errno));
}
processSwapped = false;
continue;
} else if (r.second.EndsWith(_S(".swap"))) {
// Compaction failed mid-way
// Before we had a chance to append .old to all previous segment files, the broker crashed
//
// If any *.cleaned files are found, we didn't get to append .swap to all new segments files so we need to
// undo the effects by removing all .swap and .cleaned files
// If no *.cleaned files are found, we got to append .swap to all new segments files, so we should
// remove the *.swap extension and remove all *.old files
if (processSwapped == false) {
auto fullPath = Buffer::build(basePath, "/", name);
if (Unlink(fullPath.data()) == -1) {
throw Switch::system_error("Failed to Unlink(", fullPath, "):", strerror(errno));
}
} else {
// we 'll process them in the end, iff processSwapped is still true by then
swapped.emplace_back(allocator.CopyOf(name.p, name.len), name.len);
}
continue;
} else if (r.second.StripSuffix(_S(".old"))) {
// Compaction failed mid-way
//
// If any *.swap files are found, we didn't manage to strip the .swap extension from all new segments files
// but that's OK. We should still remove the .swap extension and remove all *.old files
//
// We are just going to remove the extension and consider the file
if (Rename(Buffer::build(basePath, "/", name).data(),
Buffer::build(basePath, "/", strwlen8_t(name.p, name.len - STRLEN(".old"))).data()) == -1) {
throw Switch::system_error("Unable to rename .old file:", strerror(errno));
}
}
if (r.second.Eq(_S("index"))) {
// accept
const auto v = r.first.divided('_');
if (v.second.Eq(_S("64"))) {
// Just so that ro_segment::ro_segment() won't have to try different names until it gets it right
wideEntyRoLogIndices.insert(v.first.as_uint64());
}
} else if (r.second.Eq(_S("ilog"))) {
// Immutable log
auto s = r.first;
uint32_t creationTS{0};
if (const auto *const p = s.Search('_')) {
// Creation TS is encoded in the name
creationTS = s.SuffixFrom(p + 1).AsUint32();
s = s.PrefixUpto(p);
}
const auto repr = s.divided('-');
const auto baseSeqNum = repr.first.as_uint64(), lastAvailSeqNum = repr.second.as_uint64();
if (trace) {
SLog("collected ROLog ( baseSeqNum = ", baseSeqNum, ", lastAvailSeqNum = ", lastAvailSeqNum, ", creationTS = ", creationTS, ") r.first = ", r.first, "\n");
}
roLogs.push_back({
baseSeqNum,
lastAvailSeqNum,
creationTS,
});
} else if (r.second.Eq(_S("log"))) {
// current, mutable log(segment)
//
// Either num.log or
// num_ts.log
// the later encodes the creation timestamp in the path, which is useful because
// we 'd like to know when this was created, when we restart the service and get to continue using the selected log
if (const auto *const p = r.first.Search('_')) {
*name.CopyTo(_base_path + b.size() + 1) = '\0';
if (-1 == stat(_base_path, &st)) {
Print("Failed to stat ", _base_path, ": ", strerror(errno), "\n");
std::abort();
}
if (0 == st.st_size) {
// This is a stray - whatever the reason this is here, it needs to go
Print("Found a stray ", _base_path, ", deleting it\n");
TANK_EXPECT(false == read_only);
unlink(_base_path);
continue;
}
const auto seqRepr = r.first.PrefixUpto(p);
const auto tsRepr = r.first.SuffixFrom(p + 1);
if (!seqRepr.IsDigits() || !tsRepr.IsDigits()) {
throw Switch::system_error("Unexpected name ", name);
} else {
const auto seq = seqRepr.as_uint64();
TANK_EXPECT(seq);
curLogSeqNum = seq;
curLogCreateTS = tsRepr.AsUint32();
if (!curLogSeqNum) {
Print(ansifmt::bold, ansifmt::color_red, "Unexpected, curLogSeqNum == 0 from ", _base_path, ansifmt::reset, " name='", name, "'\n");
std::abort();
}
if (trace) {
SLog("curLogSeqNum = ", curLogSeqNum, ", curLogCreateTS = ", curLogCreateTS, " from ", r.first, "\n");
}
}
} else {
if (unlikely(!r.first.all_of_digits())) {
throw Switch::system_error("Unexpected name ", name);
} else {
const auto seq = r.first.as_uint64();
TANK_EXPECT(seq);
TANK_EXPECT(!curLogSeqNum);
curLogSeqNum = seq;
}
}
} else {
Print("Unexpected name ", name, " in ", basePath, "\n");
}
}
_dir.reset();
if (any_files) {
partition->flags &= ~unsigned(topic_partition::Flags::NoDataFiles);
}
// Finish merge process if needed and if it's possible
if (processSwapped == false) {
if (trace) {
SLog("Cannot process any swapped files\n");
}
while (!swapped.empty()) {
auto it = swapped.back();
TANK_EXPECT(false == read_only);
if (Unlink(Buffer::build(basePath, "/", it).data()) == -1) {
throw Switch::system_error("Failed to unlink swapped file:", strerror(errno));
}
swapped.pop_back();
}
} else {
if (trace) {
SLog("Can process swapped files\n");
}
while (not swapped.empty()) {
auto name = swapped.back();
name.StripSuffix(".swap"_len);
if (trace) {
SLog("Processing swapped ", name, "\n");
}
if (Rename(Buffer::build(basePath, "/", name, ".swap").data(),
Buffer::build(basePath, "/", name).data()) == -1) {
throw Switch::system_error("Failed to rename swapped file:", strerror(errno));
}
const auto r = name.divided('.');
if (r.second.Eq(_S("index"))) {
const auto v = r.first.divided('_');
if (v.second.Eq(_S("64"))) {
// Just so that ro_segment::ro_segment() won't have to try different names until it gets it right
wideEntyRoLogIndices.insert(v.first.as_uint64());
}
} else if (r.second.Eq(_S("ilog"))) {
auto s = r.first;
uint32_t creationTS{0};
if (const auto *const p = s.Search('_')) {
// Creation TS is encoded in the name
creationTS = s.SuffixFrom(p + 1).AsUint32();
s = s.PrefixUpto(p);
}
const auto repr = s.Divided('-');
const auto baseSeqNum = repr.first.as_uint64(), lastAvailSeqNum = repr.second.as_uint64();
if (trace) {
SLog("Collected ROLog ( ", baseSeqNum, ", ", lastAvailSeqNum, ", ", creationTS, ") ", r.first, "\n");
}
roLogs.push_back({
baseSeqNum,
lastAvailSeqNum,
creationTS,
});
}
swapped.pop_back();
}
}
if (trace) {
SLog("roLogs.size() = ", roLogs.size(),
", curLogSeqNum = ", curLogSeqNum,
", curLogCreateTS = ", curLogCreateTS, "\n");
}
// Process read only segments
if (const auto total = roLogs.size()) {
std::sort(roLogs.begin(), roLogs.end(), [](const auto &a, const auto &b) noexcept {
return a.firstAvailableSeqNum < b.firstAvailableSeqNum;
});
l->firstAvailableSeqNum = roLogs.front().firstAvailableSeqNum;
l->roSegments.reset(new std::vector<ro_segment *>());
for (const auto &it : roLogs) {
if (trace) {
SLog("Initializing [firstAvailableSeqNum=", it.firstAvailableSeqNum,
",lastAvailSeqNum=", it.lastAvailSeqNum, ", base = ", b, "]\n");
}
try {
auto s = std::make_unique<ro_segment>(it.firstAvailableSeqNum,
it.lastAvailSeqNum,
b,
it.creationTS,
wideEntyRoLogIndices.count(it.firstAvailableSeqNum));
assert(not s->fdh);
l->roSegments->emplace_back(s.release());
} catch (const std::exception &e) {
if (trace) {
SLog("Failed:", e.what(), "\n");
}
throw;
}
}
if (trace) {
SLog("All RO segments\n");
for (const auto s : *l->roSegments) {
SLog("Segment ", ptr_repr(s), " with baseSeqNum ", s->baseSeqNum, "\n");
}
}
TANK_EXPECT(std::is_sorted(l->roSegments->begin(), l->roSegments->end(), [](const auto a, const auto b) noexcept {
return a->baseSeqNum < b->baseSeqNum;
}));
for (auto seg : *l->roSegments) {
assert(not seg->fdh);
}
} else {
l->firstAvailableSeqNum = curLogSeqNum;
l->roSegments.reset(new std::vector<ro_segment *>());
}
// Have a current segment?
if (curLogSeqNum) {
if (curLogCreateTS) {
Snprint(basePath, sizeof(basePath), b, curLogSeqNum, "_", curLogCreateTS, ".log");
} else {
Snprint(basePath, sizeof(basePath), b, curLogSeqNum, ".log");
}
if (trace){
SLog("Have current segment:", basePath, "\n");
}
fd = open(basePath, read_only ? O_RDONLY : (O_RDWR | O_LARGEFILE | O_CREAT | O_NOATIME), 0775);
if (fd == -1) [[unlikely]] {
throw Switch::system_error("open(", basePath, ") failed:", strerror(errno), ". Cannot open current segment log");
}
l->cur.fdh.reset(new fd_handle(fd));
l->cur.baseSeqNum = curLogSeqNum;
l->cur.fileSize = lseek64(fd, 0, SEEK_END);
// TODO(markp): check if index has wideEntries
// and set l->cur.index.haveWideEntries accordingly
Snprint(basePath, sizeof(basePath), b, curLogSeqNum, ".index");
fd = open(basePath, read_only ? O_RDWR : (O_RDWR | O_LARGEFILE | O_CREAT | O_NOATIME | O_APPEND), 0775);
if (trace) {
SLog("Considering index ", basePath, " cur.fileSize = ", l->cur.fileSize, ", with cur.baseSeqNum = ", l->cur.baseSeqNum, "\n");
}
if (fd == -1) [[unlikely]] {
throw Switch::system_error("open(", basePath_, ") failed:", strerror(errno), ". Cannot open current segment index");
} else if (lseek64(fd, 0, SEEK_END) == 0 && l->cur.fileSize) {
if (trace) {
SLog("Empty index, but datafile is not empty: will need to rebuild\n");
}
Service::rebuild_index(l->cur.fdh->fd, fd, curLogSeqNum);
} else if (l->cur.fileSize == 0) {
if (trace) {
SLog("Got a dummy/empty current segment, will reset\n");
}
TANK_EXPECT(false == read_only);
if (-1 == unlink(basePath)) {
throw Switch::system_error("Failed to unlink(", basePath, "): ", strerror(errno));
}
if (curLogCreateTS) {
Snprint(basePath, sizeof(basePath), b, curLogSeqNum, "_", curLogCreateTS, ".log");
} else {
Snprint(basePath, sizeof(basePath), b, curLogSeqNum, ".log");
}
if (-1 == unlink(basePath)) {
throw Switch::system_error("Failed to unlink(", basePath, "): ", strerror(errno));
}
goto new_cur_segment;
}
l->cur.index.fd = fd;
l->cur.sinceLastUpdate = l->cur.fileSize == 0 ? UINT32_MAX : 0;
l->cur.ra_proxy.ra.reset_to(l->cur.fdh->fd);
assert(l->cur.fdh);
assert(l->cur.fdh->fd > 2);
assert(l->cur.ra_proxy.ra.get_fd() > 2);
assert(l->cur.ra_proxy.ra.get_fd() == l->cur.fdh->fd);
if (const auto size = lseek64(fd, 0, SEEK_END); size > 0) {
// we don't want to deserialize the skiplist for faster startup
// we 'll mmap the region though
l->cur.index.ondisk.span = size;
l->cur.index.ondisk.data = static_cast<const uint8_t *>(mmap(nullptr, size, PROT_READ, MAP_SHARED, fd, 0));
if (unlikely(l->cur.index.ondisk.data == MAP_FAILED)) {
throw Switch::system_error("mmap() failed:", strerror(errno));
}
madvise((void *)l->cur.index.ondisk.data, size, MADV_DONTDUMP);
if (l->cur.index.haveWideEntries) {
IMPLEMENT_ME();
} else {
const auto *const p = (uint32_t *)(l->cur.index.ondisk.data + l->cur.index.ondisk.span - sizeof(uint32_t) - sizeof(uint32_t));
l->cur.index.ondisk.lastRecorded.relSeqNum = p[0];
l->cur.index.ondisk.lastRecorded.absPhysical = p[1];
}
if (trace) {
SLog("Have cur.index.ondisk.span = ",
l->cur.index.ondisk.span, " lastRecorded = ( relSeqNum = ",
l->cur.index.ondisk.lastRecorded.relSeqNum, ", absPhysical = ", l->cur.index.ondisk.lastRecorded.absPhysical, ")\n");
if (l->cur.index.haveWideEntries) {
IMPLEMENT_ME();
} else {
for (const auto *it = (uint32_t *)l->cur.index.ondisk.data,
*const base = it,
*const e = it + l->cur.index.ondisk.span / sizeof(uint32_t);
it != e; it += 2) {
if (it != base) {
TANK_EXPECT(it[0] != it[-2]);
}
}
}
}
} else if (size < 0) {
Print("lseek() failed:", strerror(errno), "\n");
std::abort();
}
l->lastAssignedSeqNum = 0;
if (const auto s = l->cur.fileSize) {
const auto o = l->cur.index.ondisk.lastRecorded.absPhysical;
// This is somewhat expensive; but we only need to do this whenever we open_partition_log(), usually
// once during startuo
//
// We just start from the last tracked-recorded (relSeqNum, absPhysical) and skip bundles until EOF
// keeping track of offsets as we go.
if (unlikely(s < o)) {
Print(ansifmt::bold, ansifmt::color_red, "Dataset corruption", ansifmt::reset,
": Unexpected file size ", s, "(", size_repr(s), ") < last checkpoint in index at ", o, ". Did you copy the data while the partition was actively being updated?\n");
Print("You can force repair it by deleting ", basePath,
" and restarting TANK. This will not salvage whatever data was lost, but will rebuild the index and you should be able to access the partition\n");
Print("Aborting\n");
exit(1);
}
TANK_EXPECT(s >= o);
const auto span = s - o;
auto *const data = static_cast<uint8_t *>(malloc(span));
// first message in the first bundle we 'll parse
uint64_t next = l->cur.index.ondisk.lastRecorded.relSeqNum + l->cur.baseSeqNum;
const auto savedNext{next};
int fd = l->cur.fdh->fd;
if (trace) {
SLog("From lastRecorded.relSeqNum = ",
l->cur.index.ondisk.lastRecorded.relSeqNum,
", lastRecorded.absPhysical = ", o, ", cur.baseSeqNum = ", l->cur.baseSeqNum, "\n");
SLog("span = ", span, " (file_size - last message bundle offset recorded), start from abs sequence number ", next, "\n");
}
if (unlikely(!data)) {
throw Switch::system_error("malloc(", span, ") failed");
}
DEFER({ free(data); });
assert(fd > 2);
const auto res = pread(fd, data, span, o);
const uint8_t *lastCheckpoint{data};
if (trace) {
SLog("Attempting to read ", span, " bytes at ", o, ": ", res, "\n");
}
if (res != span) [[unlikely]] {
throw Switch::system_error("pread64() failed:", strerror(errno));
}
for (const auto *p = data, *const e = p + span; p < e;) {
const auto *saved{p};
const auto bundleLen = Compression::decode_varuint32(p);
const auto *const bundleEnd = p + bundleLen;
if (unlikely(bundleLen == 0 || bundleEnd > e)) {
const auto ckpt = (lastCheckpoint - data) + o;
Print("Likely corrupt TANK partition segment(ran out of disk space?).\n");
if (getenv("TANK_FORCE_SALVAGE_CURSEGMENT")) {
if (ftruncate(l->cur.fdh->fd, ckpt) == -1) {
Print("Failed to truncate:", strerror(errno), "\n");
exit(1);
} else if (l->cur.index.fd != -1 && ftruncate(l->cur.index.fd, 0) == -1) {
Print("Failed to truncate:", strerror(errno), "\n");
exit(1);
} else {
Print("Salvaged segment. Please restart Tank\n");
}
} else {
Print("Set TANK_FORCE_SALVAGE_CURSEGMENT=1 and restart Tank so that it will _delete_ the current segment index and truncate the current segment file so that it will salvage whatever's possible\n");
Print("Can save up to ", size_repr(ckpt), ", will lose ", size_repr(s - ckpt), "\n");
Print("Aborting\n");
}
exit(1);
}
TANK_EXPECT(bundleLen);
lastCheckpoint = saved;
const auto bundleFlags = *p++;
const bool sparseBundleBitSet = bundleFlags & (1u << 6);
const uint32_t msgSetSize = ((bundleFlags >> 2) & 0xf) ?: Compression::decode_varuint32(p);
if (trace) {
SLog("bundleFlags = ", bundleFlags, ", sparseBundleBitSet = ", sparseBundleBitSet, ", msgSetSize = ", msgSetSize, "\n");
}
if (sparseBundleBitSet) {
const auto firstMsgSeqNum = decode_pod<uint64_t>(p);
uint64_t lastMsgSeqNum;
if (msgSetSize != 1) {
lastMsgSeqNum = firstMsgSeqNum + Compression::decode_varuint32(p) + 1;
} else {
lastMsgSeqNum = firstMsgSeqNum;
}
if (trace) {
SLog("sparse bundle, firstMsgSeqNum = ", firstMsgSeqNum, ", lastMsgSeqNum = ", lastMsgSeqNum, "\n");
}
next = lastMsgSeqNum + 1;
} else {
next += msgSetSize;
}
if (trace) {
SLog("bundle msgSetSize = ", msgSetSize, "\n");
}
p = bundleEnd;
TANK_EXPECT(p <= e);
}
TANK_EXPECT(next > savedNext);
TANK_EXPECT(l->cur.sinceLastUpdate == 0); // not an empty current segment log
l->lastAssignedSeqNum = next - 1;
set_hwmark(partition, l->lastAssignedSeqNum);
if (trace) {
SLog(ansifmt::bold, "Set lastAssignedSeqNum = ", l->lastAssignedSeqNum, ansifmt::reset, "\n");
}
}
// Just in case
lseek(l->cur.index.fd, 0, SEEK_END);
lseek(l->cur.fdh->fd, 0, SEEK_END);
if (const uint32_t max = l->config.maxRollJitterSecs) {
std::random_device dev;
std::mt19937 rng(dev());
std::uniform_int_distribution<uint32_t> distr(0, max);
l->cur.rollJitterSecs = std::max<uint32_t>(distr(rng),
Timings::Hours::ToSeconds(1));
} else {
// something sensible
l->cur.rollJitterSecs = std::max<uint32_t>(Timings::Hours::ToSeconds(1), Timings::Weeks::ToSeconds(1));
}
const auto now = time(nullptr);
if (now == ((time_t)-1)) {
// Yes, this is possible
IMPLEMENT_ME();
}
l->cur.createdTS = curLogCreateTS ?: now;
l->cur.nameEncodesTS = curLogCreateTS;
l->cur.flush_state.pendingFlushMsgs = 0;
l->cur.flush_state.nextFlushTS = config.flushIntervalSecs ? now + config.flushIntervalSecs : UINT32_MAX;
if (l->lastAssignedSeqNum >= l->cur.baseSeqNum) {
// OK
} else {
Print("UNEXPECTED lastAssignedSeqNum(", l->lastAssignedSeqNum, ") baseSeqNum(", l->cur.baseSeqNum, ") for ", basePath_, "\n");
std::abort();
}
if (trace) {
SLog("createdTS(", l->cur.createdTS, ") nameEncodesTS(", l->cur.nameEncodesTS, ")\n");
}
} else {
// We 'll just create those on demand in append() (lazily)
new_cur_segment:
l->cur.fdh.reset();
l->cur.fileSize = UINT32_MAX;
l->cur.index.fd = -1;
l->cur.sinceLastUpdate = UINT32_MAX;
l->cur.baseSeqNum = UINT64_MAX;
l->lastAssignedSeqNum = 0;
l->cur.index.haveWideEntries = false;
l->cur.reset_cache();
if (l->roSegments and not l->roSegments->empty()) {
// We can still use the last immutable segment
Print(ansifmt::bold, ansifmt::color_red, "Looks like someone deleted the active segment from ", basePath, ansifmt::reset, "\n");
l->lastAssignedSeqNum = l->roSegments->back()->lastAvailSeqNum;
set_hwmark(partition, l->lastAssignedSeqNum);
} else {
set_hwmark(partition, 0);
}
}
partition->open_ok = true;
++total_open_partitions;
} catch (const std::exception &e) {
// we need to _close_ the partition explicitly because we couldn't open it
// this should reclaim resources, and partition will no longer be considered open, because it is not
if (trace) {
SLog("Exception:", e.what(), "\n");
}
close_partition_log(partition);
throw;
}
if (trace) {