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couch-kvstore.cc
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/* -*- Mode: C++; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- */
#include "config.h"
#include <string.h>
#include <cstdlib>
#include <cctype>
#include <algorithm>
#include <stdio.h>
#include <sys/types.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <iostream>
#include <fstream>
#include "common.hh"
#include "couch-kvstore/couch-kvstore.hh"
#include "couch-kvstore/dirutils.hh"
#include "warmup.hh"
#include "tools/cJSON.h"
#include "tools/JSON_checker.h"
#define STATWRITER_NAMESPACE couchstore_engine
#include "statwriter.hh"
#undef STATWRITER_NAMESPACE
using namespace CouchKVStoreDirectoryUtilities;
static const int MUTATION_FAILED = -1;
static const int DOC_NOT_FOUND = 0;
static const int MUTATION_SUCCESS = 1;
static const int MAX_OPEN_DB_RETRY = 10;
extern "C" {
static int recordDbDumpC(Db *db, DocInfo *docinfo, void *ctx)
{
return CouchKVStore::recordDbDump(db, docinfo, ctx);
}
}
extern "C" {
static int getMultiCbC(Db *db, DocInfo *docinfo, void *ctx)
{
return CouchKVStore::getMultiCb(db, docinfo, ctx);
}
}
extern "C" {
static std::string getStrError() {
const size_t max_msg_len = 256;
char msg[max_msg_len];
couchstore_last_os_error(msg, max_msg_len);
std::string errorStr(msg);
return errorStr;
}
}
static bool isJSON(const value_t &value)
{
const int len = value->length();
const unsigned char *data = (unsigned char*) value->getData();
return checkUTF8JSON(data, len);
}
static const std::string getJSONObjString(const cJSON *i)
{
if (i == NULL) {
return "";
}
if (i->type != cJSON_String) {
abort();
}
return i->valuestring;
}
static bool endWithCompact(const std::string &filename)
{
size_t pos = filename.find(".compact");
if (pos == std::string::npos || (filename.size() - sizeof(".compact")) != pos) {
return false;
}
return true;
}
static uint64_t dbFileRev(const std::string &dbname)
{
char *ptr = NULL;
size_t secondDot = dbname.rfind(".");
return strtoull(dbname.substr(secondDot + 1).c_str(), &ptr, 10);
}
static void discoverDbFiles(const std::string &dir, std::vector<std::string> &v)
{
std::vector<std::string> files = findFilesContaining(dir, ".couch");
std::vector<std::string>::iterator ii;
for (ii = files.begin(); ii != files.end(); ++ii) {
if (!endWithCompact(*ii)) {
v.push_back(*ii);
}
}
}
static uint64_t computeMaxDeletedSeqNum(DocInfo **docinfos, const int numdocs)
{
uint64_t max = 0;
for (int idx = 0; idx < numdocs; idx++) {
if (docinfos[idx]->deleted) {
// check seq number only from a deleted file
uint64_t seqNum = docinfos[idx]->rev_seq;
max = std::max(seqNum, max);
}
}
return max;
}
static int getMutationStatus(couchstore_error_t errCode)
{
switch (errCode) {
case COUCHSTORE_SUCCESS:
return MUTATION_SUCCESS;
case COUCHSTORE_ERROR_NO_HEADER:
case COUCHSTORE_ERROR_NO_SUCH_FILE:
case COUCHSTORE_ERROR_DOC_NOT_FOUND:
// this return causes ep engine to drop the failed flush
// of an item since it does not know about the itme any longer
return DOC_NOT_FOUND;
default:
// this return causes ep engine to keep requeuing the failed
// flush of an item
return MUTATION_FAILED;
}
}
static bool allDigit(std::string &input)
{
size_t numchar = input.length();
for(size_t i = 0; i < numchar; ++i) {
if (!isdigit(input[i])) {
return false;
}
}
return true;
}
static std::string couchkvstore_strerrno(couchstore_error_t err) {
return (err == COUCHSTORE_ERROR_OPEN_FILE ||
err == COUCHSTORE_ERROR_READ ||
err == COUCHSTORE_ERROR_WRITE) ? getStrError() : "none";
}
struct GetMultiCbCtx {
GetMultiCbCtx(CouchKVStore &c, uint16_t v, vb_bgfetch_queue_t &f) :
cks(c), vbId(v), fetches(f) {}
CouchKVStore &cks;
uint16_t vbId;
vb_bgfetch_queue_t &fetches;
};
struct StatResponseCtx {
public:
StatResponseCtx(std::map<std::pair<uint16_t, uint16_t>, vbucket_state> &sm,
uint16_t vb) : statMap(sm), vbId(vb) {
/* EMPTY */
}
std::map<std::pair<uint16_t, uint16_t>, vbucket_state> &statMap;
uint16_t vbId;
};
struct LoadResponseCtx {
shared_ptr<Callback<GetValue> > callback;
uint16_t vbucketId;
bool keysonly;
EPStats *stats;
};
CouchRequest::CouchRequest(const Item &it, uint64_t rev, CouchRequestCallback &cb, bool del) :
value(it.getValue()), valuelen(it.getNBytes()),
vbucketId(it.getVBucketId()), fileRevNum(rev),
key(it.getKey()), deleteItem(del)
{
bool isjson = false;
uint64_t cas = htonll(it.getCas());
uint32_t flags = it.getFlags();
uint32_t exptime = it.getExptime();
// Save time of deletion in expiry time field of deleted item's metadata.
if (del) {
exptime = ep_real_time();
}
exptime = htonl(exptime);
itemId = (it.getId() <= 0) ? 1 : 0;
dbDoc.id.buf = const_cast<char *>(key.c_str());
dbDoc.id.size = it.getNKey();
if (valuelen) {
isjson = isJSON(value);
dbDoc.data.buf = const_cast<char *>(value->getData());
dbDoc.data.size = valuelen;
} else {
dbDoc.data.buf = NULL;
dbDoc.data.size = 0;
}
memcpy(meta, &cas, 8);
memcpy(meta + 8, &exptime, 4);
memcpy(meta + 12, &flags, 4);
dbDocInfo.rev_meta.buf = reinterpret_cast<char *>(meta);
dbDocInfo.rev_meta.size = COUCHSTORE_METADATA_SIZE;
dbDocInfo.rev_seq = it.getSeqno();
dbDocInfo.size = dbDoc.data.size;
if (del) {
dbDocInfo.deleted = 1;
callback.delCb = cb.delCb;
} else {
dbDocInfo.deleted = 0;
callback.setCb = cb.setCb;
}
dbDocInfo.id = dbDoc.id;
dbDocInfo.content_meta = isjson ? COUCH_DOC_IS_JSON : COUCH_DOC_NON_JSON_MODE;
//Compress everything. Snappy is fast. Don't attempt to compress empty bodies.
if(dbDoc.data.size > 0 && !deleteItem) {
dbDocInfo.content_meta |= COUCH_DOC_IS_COMPRESSED;
}
start = gethrtime();
}
CouchKVStore::CouchKVStore(EPStats &stats, Configuration &config, bool read_only) :
KVStore(read_only), epStats(stats), configuration(config),
dbname(configuration.getDbname()), couchNotifier(NULL), pendingCommitCnt(0),
intransaction(false)
{
open();
statCollectingFileOps = getCouchstoreStatsOps(&st.fsStats);
}
CouchKVStore::CouchKVStore(const CouchKVStore ©From) :
KVStore(copyFrom), epStats(copyFrom.epStats),
configuration(copyFrom.configuration),
dbname(copyFrom.dbname),
couchNotifier(NULL),
pendingCommitCnt(0), intransaction(false)
{
open();
dbFileMap = copyFrom.dbFileMap;
statCollectingFileOps = getCouchstoreStatsOps(&st.fsStats);
}
void CouchKVStore::reset()
{
assert(!isReadOnly());
// TODO CouchKVStore::flush() when couchstore api ready
RememberingCallback<bool> cb;
couchNotifier->flush(cb);
cb.waitForValue();
vbucket_map_t::iterator itor = cachedVBStates.begin();
for (; itor != cachedVBStates.end(); ++itor) {
uint16_t vbucket = itor->first;
itor->second.checkpointId = 0;
itor->second.maxDeletedSeqno = 0;
resetVBucket(vbucket, itor->second);
updateDbFileMap(vbucket, 1, true);
}
}
void CouchKVStore::set(const Item &itm, Callback<mutation_result> &cb)
{
assert(!isReadOnly());
assert(intransaction);
bool deleteItem = false;
CouchRequestCallback requestcb;
std::string dbFile;
uint64_t fileRev = 1;
requestcb.setCb = &cb;
if ((getDbFile(itm.getVBucketId(), dbFile))) {
fileRev = dbFileRev(dbFile);
} else {
LOG(EXTENSION_LOG_DEBUG, "Warning: cannot locate database file %s",
dbFile.c_str());
}
// each req will be de-allocated after commit
CouchRequest *req = new CouchRequest(itm, fileRev, requestcb, deleteItem);
queueItem(req);
}
void CouchKVStore::get(const std::string &key, uint64_t, uint16_t vb,
Callback<GetValue> &cb)
{
hrtime_t start = gethrtime();
Db *db = NULL;
std::string dbFile;
GetValue rv;
if (!(getDbFile(vb, dbFile))) {
// just log error, openDB will attemp to open the database
// file again and handle the final error
LOG(EXTENSION_LOG_DEBUG, "Info: cannot locate database file %s",
dbFile.c_str());
}
couchstore_error_t errCode = openDB(vb, dbFileRev(dbFile), &db,
COUCHSTORE_OPEN_FLAG_RDONLY);
if (errCode != COUCHSTORE_SUCCESS) {
++st.numGetFailure;
LOG(EXTENSION_LOG_WARNING,
"Warning: failed to open database to retrieve data "
"from vBucketId = %d, key = %s, file = %s\n",
vb, key.c_str(), dbFile.c_str());
rv.setStatus(couchErr2EngineErr(errCode));
cb.callback(rv);
return;
}
RememberingCallback<GetValue> *rc = dynamic_cast<RememberingCallback<GetValue> *>(&cb);
bool getMetaOnly = rc && rc->val.isPartial();
DocInfo *docInfo = NULL;
sized_buf id;
id.size = key.size();
id.buf = const_cast<char *>(key.c_str());
errCode = couchstore_docinfo_by_id(db, (uint8_t *)id.buf, id.size, &docInfo);
if (errCode != COUCHSTORE_SUCCESS) {
if (!getMetaOnly) {
// log error only if this is non-xdcr case
LOG(EXTENSION_LOG_WARNING,
"Warning: failed to retrieve doc info from "
"database, name=%s key=%s error=%s [%s]\n",
dbFile.c_str(), id.buf, couchstore_strerror(errCode),
couchkvstore_strerrno(errCode).c_str());
}
} else {
assert(docInfo);
errCode = fetchDoc(db, docInfo, rv, vb, getMetaOnly);
if (errCode != COUCHSTORE_SUCCESS) {
LOG(EXTENSION_LOG_WARNING,
"Warning: failed to retrieve key value from "
"database, name=%s key=%s error=%s [%s] "
"deleted=%s", dbFile.c_str(), id.buf,
couchstore_strerror(errCode),
couchkvstore_strerrno(errCode).c_str(),
docInfo->deleted ? "yes" : "no");
}
// record stats
st.readTimeHisto.add((gethrtime() - start) / 1000);
if (errCode == COUCHSTORE_SUCCESS) {
st.readSizeHisto.add(key.length() + rv.getValue()->getNBytes());
}
}
if(errCode != COUCHSTORE_SUCCESS) {
++st.numGetFailure;
}
couchstore_free_docinfo(docInfo);
closeDatabaseHandle(db);
rv.setStatus(couchErr2EngineErr(errCode));
cb.callback(rv);
}
void CouchKVStore::getMulti(uint16_t vb, vb_bgfetch_queue_t &itms)
{
std::string dbFile;
int numItems = itms.size();
if (!(getDbFile(vb, dbFile))) {
// just log error, openDB will attempt to open the database
// file again and handle the final error
LOG(EXTENSION_LOG_DEBUG, "Info: cannot locate database file %s",
dbFile.c_str());
}
Db *db = NULL;
couchstore_error_t errCode = openDB(vb, dbFileRev(dbFile), &db,
COUCHSTORE_OPEN_FLAG_RDONLY);
if (errCode != COUCHSTORE_SUCCESS) {
LOG(EXTENSION_LOG_WARNING,
"Warning: failed to open database for data fetch, "
"vBucketId = %d file = %s numDocs = %d\n",
vb, dbFile.c_str(), numItems);
st.numGetFailure += numItems;
vb_bgfetch_queue_t::iterator itr = itms.begin();
for (; itr != itms.end(); itr++) {
std::list<VBucketBGFetchItem *> &fetches = (*itr).second;
std::list<VBucketBGFetchItem *>::iterator fitr = fetches.begin();
for (; fitr != fetches.end(); fitr++) {
(*fitr)->value.setStatus(ENGINE_NOT_MY_VBUCKET);
}
}
return;
}
std::vector<uint64_t> seqIds;
VBucketBGFetchItem *item2fetch;
vb_bgfetch_queue_t::iterator itr = itms.begin();
for (; itr != itms.end(); itr++) {
item2fetch = (*itr).second.front();
seqIds.push_back(item2fetch->value.getId());
}
GetMultiCbCtx ctx(*this, vb, itms);
errCode = couchstore_docinfos_by_sequence(db, &seqIds[0], seqIds.size(),
0, getMultiCbC, &ctx);
if (errCode != COUCHSTORE_SUCCESS) {
st.numGetFailure += numItems;
for (itr = itms.begin(); itr != itms.end(); itr++) {
std::list<VBucketBGFetchItem *> &fetches = (*itr).second;
std::list<VBucketBGFetchItem *>::iterator fitr = fetches.begin();
for (; fitr != fetches.end(); fitr++) {
LOG(EXTENSION_LOG_WARNING, "Warning: failed to read database by"
" sequence id = %lld, vBucketId = %d "
"key = %s file = %s error = %s [%s]\n",
(*fitr)->value.getId(), vb, (*fitr)->key.c_str(),
dbFile.c_str(), couchstore_strerror(errCode),
couchkvstore_strerrno(errCode).c_str());
(*fitr)->value.setStatus(couchErr2EngineErr(errCode));
}
}
}
closeDatabaseHandle(db);
}
void CouchKVStore::del(const Item &itm,
uint64_t,
Callback<int> &cb)
{
assert(!isReadOnly());
assert(intransaction);
std::string dbFile;
CouchRequestCallback requestcb;
uint64_t fileRev = 1;
requestcb.delCb = &cb;
if (getDbFile(itm.getVBucketId(), dbFile)) {
fileRev = dbFileRev(dbFile);
} else {
LOG(EXTENSION_LOG_WARNING,
"Warning: cannot locate database file %s for delete\n",
dbFile.c_str());
}
// each req will be de-allocated after commit
CouchRequest *req = new CouchRequest(itm, fileRev, requestcb, true);
queueItem(req);
}
bool CouchKVStore::delVBucket(uint16_t vbucket, bool recreate)
{
assert(!isReadOnly());
assert(couchNotifier);
RememberingCallback<bool> cb;
couchNotifier->delVBucket(vbucket, cb);
cb.waitForValue();
if (recreate) {
vbucket_state vbstate(vbucket_state_dead, 0, 0);
vbucket_map_t::iterator it = cachedVBStates.find(vbucket);
if (it != cachedVBStates.end()) {
vbstate.state = it->second.state;
}
cachedVBStates[vbucket] = vbstate;
resetVBucket(vbucket, vbstate);
} else {
cachedVBStates.erase(vbucket);
}
updateDbFileMap(vbucket, 1, false);
return cb.val;
}
vbucket_map_t CouchKVStore::listPersistedVbuckets()
{
std::vector<std::string> files;
if (dbFileMap.empty()) {
// warmup, first discover db files from local directory
discoverDbFiles(dbname, files);
populateFileNameMap(files);
}
if (!cachedVBStates.empty()) {
cachedVBStates.clear();
}
Db *db = NULL;
couchstore_error_t errorCode;
std::map<uint16_t, uint64_t>::iterator itr = dbFileMap.begin();
for (; itr != dbFileMap.end(); itr++) {
errorCode = openDB(itr->first, itr->second, &db,
COUCHSTORE_OPEN_FLAG_RDONLY);
if (errorCode != COUCHSTORE_SUCCESS) {
std::stringstream rev, vbid;
rev << itr->second;
vbid << itr->first;
std::string fileName = dbname + "/" + vbid.str() + ".couch." + rev.str();
LOG(EXTENSION_LOG_WARNING,
"Warning: failed to open database file, name=%s\n",
fileName.c_str());
remVBucketFromDbFileMap(itr->first);
} else {
vbucket_state vb_state;
uint16_t vbID = itr->first;
/* read state of VBucket from db file */
readVBState(db, vbID, vb_state);
/* insert populated state to the array to return to the caller */
cachedVBStates[vbID] = vb_state;
/* update stat */
++st.numLoadedVb;
closeDatabaseHandle(db);
}
db = NULL;
}
return cachedVBStates;
}
void CouchKVStore::getPersistedStats(std::map<std::string, std::string> &stats)
{
char *buffer = NULL;
std::string fname = dbname + "/stats.json";
if (access(fname.c_str(), R_OK) == -1) {
return ;
}
std::ifstream session_stats;
session_stats.exceptions (session_stats.failbit | session_stats.badbit);
try {
session_stats.open(fname.c_str(), ios::binary);
session_stats.seekg (0, ios::end);
int flen = session_stats.tellg();
if (flen < 0) {
LOG(EXTENSION_LOG_WARNING,
"Warning: error in session stats ifstream!!!");
session_stats.close();
return;
}
session_stats.seekg (0, ios::beg);
buffer = new char[flen + 1];
session_stats.read(buffer, flen);
session_stats.close();
buffer[flen] = '\0';
cJSON *json_obj = cJSON_Parse(buffer);
if (!json_obj) {
LOG(EXTENSION_LOG_WARNING,
"Warning: failed to parse the session stats json doc!!!");
delete[] buffer;
return;
}
int json_arr_size = cJSON_GetArraySize(json_obj);
for (int i = 0; i < json_arr_size; ++i) {
cJSON *obj = cJSON_GetArrayItem(json_obj, i);
if (obj) {
stats[obj->string] = obj->valuestring ? obj->valuestring : "";
}
}
cJSON_Delete(json_obj);
} catch (const std::ifstream::failure &e) {
LOG(EXTENSION_LOG_WARNING,
"Warning: failed to load the engine session stats "
" due to IO exception \"%s\"", e.what());
} catch (...) {
LOG(EXTENSION_LOG_WARNING,
"Warning: failed to load the engine session stats "
" due to IO exception");
}
delete[] buffer;
}
bool CouchKVStore::snapshotVBuckets(const vbucket_map_t &vbstates)
{
assert(!isReadOnly());
bool success = true;
vbucket_map_t::const_reverse_iterator iter = vbstates.rbegin();
for (; iter != vbstates.rend(); ++iter) {
uint16_t vbucketId = iter->first;
vbucket_state vbstate = iter->second;
vbucket_map_t::iterator it = cachedVBStates.find(vbucketId);
uint32_t vb_change_type = VB_NO_CHANGE;
if (it != cachedVBStates.end()) {
if (it->second.state != vbstate.state) {
vb_change_type |= VB_STATE_CHANGED;
}
if (it->second.checkpointId != vbstate.checkpointId) {
vb_change_type |= VB_CHECKPOINT_CHANGED;
}
if (vb_change_type == VB_NO_CHANGE) {
continue; // no changes
}
it->second.state = vbstate.state;
it->second.checkpointId = vbstate.checkpointId;
// Note that the max deleted seq number is maintained within CouchKVStore
vbstate.maxDeletedSeqno = it->second.maxDeletedSeqno;
} else {
vb_change_type = VB_STATE_CHANGED;
cachedVBStates[vbucketId] = vbstate;
}
success = setVBucketState(vbucketId, vbstate, vb_change_type, false);
if (!success) {
LOG(EXTENSION_LOG_WARNING,
"Warning: failed to set new state, %s, for vbucket %d\n",
VBucket::toString(vbstate.state), vbucketId);
break;
}
}
return success;
}
bool CouchKVStore::snapshotStats(const std::map<std::string, std::string> &stats)
{
assert(!isReadOnly());
size_t count = 0;
size_t size = stats.size();
std::stringstream stats_buf;
stats_buf << "{";
std::map<std::string, std::string>::const_iterator it = stats.begin();
for (; it != stats.end(); ++it) {
stats_buf << "\"" << it->first << "\": \"" << it->second << "\"";
++count;
if (count < size) {
stats_buf << ", ";
}
}
stats_buf << "}";
// TODO: This stats json should be written into the master database. However,
// we don't support the write synchronization between CouchKVStore in C++ and
// compaction manager in the erlang side for the master database yet. At this time,
// we simply log the engine stats into a separate json file. As part of futhre work,
// we need to get rid of the tight coupling between those two components.
bool rv = true;
std::string next_fname = dbname + "/stats.json.new";
std::ofstream new_stats;
new_stats.exceptions (new_stats.failbit | new_stats.badbit);
try {
new_stats.open(next_fname.c_str());
new_stats << stats_buf.str().c_str() << std::endl;
new_stats.flush();
new_stats.close();
} catch (const std::ofstream::failure& e) {
LOG(EXTENSION_LOG_WARNING, "Warning: failed to log the engine stats due"
" to IO exception \"%s\"", e.what());
rv = false;
}
if (rv) {
std::string old_fname = dbname + "/stats.json.old";
std::string stats_fname = dbname + "/stats.json";
if (access(old_fname.c_str(), F_OK) == 0 && remove(old_fname.c_str()) != 0) {
LOG(EXTENSION_LOG_WARNING, "FATAL: Failed to remove '%s': %s",
old_fname.c_str(), strerror(errno));
remove(next_fname.c_str());
rv = false;
} else if (access(stats_fname.c_str(), F_OK) == 0 &&
rename(stats_fname.c_str(), old_fname.c_str()) != 0) {
LOG(EXTENSION_LOG_WARNING,
"Warning: failed to rename '%s' to '%s': %s",
stats_fname.c_str(), old_fname.c_str(), strerror(errno));
remove(next_fname.c_str());
rv = false;
} else if (rename(next_fname.c_str(), stats_fname.c_str()) != 0) {
LOG(EXTENSION_LOG_WARNING,
"Warning: failed to rename '%s' to '%s': %s",
next_fname.c_str(), stats_fname.c_str(), strerror(errno));
remove(next_fname.c_str());
rv = false;
}
}
return rv;
}
bool CouchKVStore::setVBucketState(uint16_t vbucketId, vbucket_state &vbstate,
uint32_t vb_change_type, bool newfile,
bool notify)
{
Db *db = NULL;
uint64_t fileRev, newFileRev;
std::stringstream id;
std::string dbFileName;
std::map<uint16_t, uint64_t>::iterator mapItr;
id << vbucketId;
dbFileName = dbname + "/" + id.str() + ".couch";
if (newfile) {
fileRev = 1; // create a db file with rev = 1
} else {
mapItr = dbFileMap.find(vbucketId);
if (mapItr == dbFileMap.end()) {
uint64_t rev = checkNewRevNum(dbFileName, true);
if (rev == 0) {
fileRev = 1;
newfile = true;
} else {
fileRev = rev;
}
} else {
fileRev = mapItr->second;
}
}
couchstore_error_t errorCode;
bool retry = true;
while (retry) {
retry = false;
errorCode = openDB(vbucketId, fileRev, &db,
(uint64_t)COUCHSTORE_OPEN_FLAG_CREATE, &newFileRev);
if (errorCode != COUCHSTORE_SUCCESS) {
std::stringstream filename;
filename << dbname << "/" << vbucketId << ".couch." << fileRev;
++st.numVbSetFailure;
LOG(EXTENSION_LOG_WARNING,
"Warning: failed to open database, name=%s",
filename.str().c_str());
return false;
}
fileRev = newFileRev;
errorCode = saveVBState(db, vbstate);
if (errorCode != COUCHSTORE_SUCCESS) {
++st.numVbSetFailure;
LOG(EXTENSION_LOG_WARNING,
"Warning: failed to save local doc, name=%s",
dbFileName.c_str());
closeDatabaseHandle(db);
return false;
}
errorCode = couchstore_commit(db);
if (errorCode != COUCHSTORE_SUCCESS) {
++st.numVbSetFailure;
LOG(EXTENSION_LOG_WARNING,
"Warning: commit failed, vbid=%u rev=%llu error=%s [%s]",
vbucketId, fileRev, couchstore_strerror(errorCode),
couchkvstore_strerrno(errorCode).c_str());
closeDatabaseHandle(db);
return false;
} else {
if (notify) {
uint64_t newHeaderPos = couchstore_get_header_position(db);
RememberingCallback<uint16_t> lcb;
VBStateNotification vbs(vbstate.checkpointId, vbstate.state,
vb_change_type, vbucketId);
couchNotifier->notify_update(vbs, fileRev, newHeaderPos, lcb);
if (lcb.val != PROTOCOL_BINARY_RESPONSE_SUCCESS) {
if (lcb.val == PROTOCOL_BINARY_RESPONSE_ETMPFAIL) {
LOG(EXTENSION_LOG_WARNING,
"Retry notify CouchDB of update, "
"vbid=%u rev=%llu\n", vbucketId, fileRev);
retry = true;
} else {
LOG(EXTENSION_LOG_WARNING,
"Warning: failed to notify CouchDB of update, "
"vbid=%u rev=%llu error=0x%x\n",
vbucketId, fileRev, lcb.val);
if (!epStats.shutdown.isShutdown) {
closeDatabaseHandle(db);
return false;
}
}
}
}
}
closeDatabaseHandle(db);
}
return true;
}
void CouchKVStore::dump(shared_ptr<Callback<GetValue> > cb)
{
loadDB(cb, false, NULL, COUCHSTORE_NO_DELETES);
}
void CouchKVStore::dump(uint16_t vb, shared_ptr<Callback<GetValue> > cb)
{
std::vector<uint16_t> vbids;
vbids.push_back(vb);
loadDB(cb, false, &vbids);
}
void CouchKVStore::dumpKeys(const std::vector<uint16_t> &vbids, shared_ptr<Callback<GetValue> > cb)
{
(void)vbids;
loadDB(cb, true, NULL, COUCHSTORE_NO_DELETES);
}
void CouchKVStore::dumpDeleted(uint16_t vb, shared_ptr<Callback<GetValue> > cb)
{
std::vector<uint16_t> vbids;
vbids.push_back(vb);
loadDB(cb, true, &vbids, COUCHSTORE_DELETES_ONLY);
}
StorageProperties CouchKVStore::getStorageProperties()
{
StorageProperties rv(true, true, true, true);
return rv;
}
bool CouchKVStore::commit(void)
{
assert(!isReadOnly());
if (intransaction) {
intransaction = commit2couchstore() ? false : true;
}
return !intransaction;
}
void CouchKVStore::addStats(const std::string &prefix,
ADD_STAT add_stat,
const void *c)
{
const char *prefix_str = prefix.c_str();
/* stats for both read-only and read-write threads */
addStat(prefix_str, "backend_type", "couchstore", add_stat, c);
addStat(prefix_str, "open", st.numOpen, add_stat, c);
addStat(prefix_str, "close", st.numClose, add_stat, c);
addStat(prefix_str, "readTime", st.readTimeHisto, add_stat, c);
addStat(prefix_str, "readSize", st.readSizeHisto, add_stat, c);
addStat(prefix_str, "numLoadedVb", st.numLoadedVb, add_stat, c);
// failure stats
addStat(prefix_str, "failure_open", st.numOpenFailure, add_stat, c);
addStat(prefix_str, "failure_get", st.numGetFailure, add_stat, c);
if (!isReadOnly()) {
addStat(prefix_str, "failure_set", st.numSetFailure, add_stat, c);
addStat(prefix_str, "failure_del", st.numDelFailure, add_stat, c);
addStat(prefix_str, "failure_vbset", st.numVbSetFailure, add_stat, c);
addStat(prefix_str, "lastCommDocs", st.docsCommitted, add_stat, c);
addStat(prefix_str, "numCommitRetry", st.numCommitRetry, add_stat, c);
// stats for CouchNotifier
couchNotifier->addStats(prefix, add_stat, c);
}
}
void CouchKVStore::addTimingStats(const std::string &prefix,
ADD_STAT add_stat, const void *c) {
if (isReadOnly()) {
return;
}
const char *prefix_str = prefix.c_str();
addStat(prefix_str, "commit", st.commitHisto, add_stat, c);
addStat(prefix_str, "commitRetry", st.commitRetryHisto, add_stat, c);
addStat(prefix_str, "delete", st.delTimeHisto, add_stat, c);
addStat(prefix_str, "save_documents", st.saveDocsHisto, add_stat, c);
addStat(prefix_str, "writeTime", st.writeTimeHisto, add_stat, c);
addStat(prefix_str, "writeSize", st.writeSizeHisto, add_stat, c);
addStat(prefix_str, "bulkSize", st.batchSize, add_stat, c);
// Couchstore file ops stats
addStat(prefix_str, "fsReadTime", st.fsStats.readTimeHisto, add_stat, c);
addStat(prefix_str, "fsWriteTime", st.fsStats.writeTimeHisto, add_stat, c);
addStat(prefix_str, "fsSyncTime", st.fsStats.syncTimeHisto, add_stat, c);
addStat(prefix_str, "fsReadSize", st.fsStats.readSizeHisto, add_stat, c);
addStat(prefix_str, "fsWriteSize", st.fsStats.writeSizeHisto, add_stat, c);
addStat(prefix_str, "fsReadSeek", st.fsStats.readSeekHisto, add_stat, c);
}
template <typename T>
void CouchKVStore::addStat(const std::string &prefix, const char *stat, T &val,
ADD_STAT add_stat, const void *c)
{
std::stringstream fullstat;
fullstat << prefix << ":" << stat;
add_casted_stat(fullstat.str().c_str(), val, add_stat, c);
}
void CouchKVStore::optimizeWrites(std::vector<queued_item> &items)
{
assert(!isReadOnly());
if (items.empty()) {
return;
}
CompareQueuedItemsByVBAndKey cq;
std::sort(items.begin(), items.end(), cq);
}
void CouchKVStore::loadDB(shared_ptr<Callback<GetValue> > cb, bool keysOnly,
std::vector<uint16_t> *vbids,
couchstore_docinfos_options options)
{
std::vector<std::string> files;
std::map<uint16_t, uint64_t> &filemap = dbFileMap;
std::map<uint16_t, uint64_t> vbmap;
std::vector< std::pair<uint16_t, uint64_t> > vbuckets;
std::vector< std::pair<uint16_t, uint64_t> > replicaVbuckets;
bool loadingData = !vbids && !keysOnly;
if (dbFileMap.empty()) {
// warmup, first discover db files from local directory
discoverDbFiles(dbname, files);
populateFileNameMap(files);
}
if (vbids) {
// get entries for given vbucket(s) from dbFileMap
std::string dirname = dbname;
getFileNameMap(vbids, dirname, vbmap);
filemap = vbmap;
}
// order vbuckets data loading by using vbucket states
if (loadingData && cachedVBStates.empty()) {
listPersistedVbuckets();
}
std::map<uint16_t, uint64_t>::iterator fitr = filemap.begin();
for (; fitr != filemap.end(); fitr++) {
if (loadingData) {
vbucket_map_t::const_iterator vsit = cachedVBStates.find(fitr->first);
if (vsit != cachedVBStates.end()) {
vbucket_state vbs = vsit->second;
// ignore loading dead vbuckets during warmup
if (vbs.state == vbucket_state_active) {
vbuckets.push_back(make_pair(fitr->first, fitr->second));
} else if (vbs.state == vbucket_state_replica) {
replicaVbuckets.push_back(make_pair(fitr->first, fitr->second));
}
}
} else {
vbuckets.push_back(make_pair(fitr->first, fitr->second));
}
}
if (loadingData) {
std::vector< std::pair<uint16_t, uint64_t> >::iterator it = replicaVbuckets.begin();
for (; it != replicaVbuckets.end(); it++) {
vbuckets.push_back(*it);
}
}
Db *db = NULL;
couchstore_error_t errorCode;
int keyNum = 0;
std::vector< std::pair<uint16_t, uint64_t> >::iterator itr = vbuckets.begin();
for (; itr != vbuckets.end(); itr++, keyNum++) {
errorCode = openDB(itr->first, itr->second, &db,
COUCHSTORE_OPEN_FLAG_RDONLY);
if (errorCode != COUCHSTORE_SUCCESS) {
std::stringstream rev, vbid;
rev << itr->second;
vbid << itr->first;
std::string dbName = dbname + "/" + vbid.str() + ".couch." + rev.str();
LOG(EXTENSION_LOG_WARNING,
"Warning: failed to open database, name=%s\n", dbName.c_str());
remVBucketFromDbFileMap(itr->first);
} else {
LoadResponseCtx ctx;
ctx.vbucketId = itr->first;
ctx.keysonly = keysOnly;
ctx.callback = cb;
ctx.stats = &epStats;
errorCode = couchstore_changes_since(db, 0, options, recordDbDumpC,
static_cast<void *>(&ctx));
if (errorCode != COUCHSTORE_SUCCESS) {
if (errorCode == COUCHSTORE_ERROR_CANCEL) {
LOG(EXTENSION_LOG_WARNING,
"Canceling loading database, warmup has completed\n");
closeDatabaseHandle(db);
break;
} else {
LOG(EXTENSION_LOG_WARNING,
"Warning: couchstore_changes_since failed, error=%s [%s]",
couchstore_strerror(errorCode),
couchkvstore_strerrno(errorCode).c_str());
remVBucketFromDbFileMap(itr->first);
}
}
closeDatabaseHandle(db);
}
db = NULL;
}
}
void CouchKVStore::open()
{
// TODO intransaction, is it needed?
intransaction = false;
if (!isReadOnly()) {
couchNotifier = CouchNotifier::create(epStats, configuration);
}
struct stat dbstat;
bool havedir = false;