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couch-kvstore.cc
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couch-kvstore.cc
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/* -*- Mode: C++; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* Copyright 2012 Couchbase, Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "config.h"
#ifdef _MSC_VER
#define PATH_MAX MAX_PATH
#include <direct.h>
#define mkdir(a, b) _mkdir(a)
#endif
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <algorithm>
#include <cctype>
#include <cstdlib>
#include <fstream>
#include <iostream>
#include <list>
#include <map>
#include <string>
#include <utility>
#include <vector>
#include <platform/dirutils.h>
#include <cJSON.h>
#include "common.h"
#include "couch-kvstore/couch-kvstore.h"
#define STATWRITER_NAMESPACE couchstore_engine
#include "statwriter.h"
#undef STATWRITER_NAMESPACE
#include <JSON_checker.h>
#include <snappy-c.h>
using namespace CouchbaseDirectoryUtilities;
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;
static const uint32_t DEFAULT_META_LEN = 16;
class NoLookupCallback : public Callback<CacheLookup> {
public:
NoLookupCallback() {}
~NoLookupCallback() {}
void callback(CacheLookup&) {}
};
class NoRangeCallback : public Callback<SeqnoRange> {
public:
NoRangeCallback() {}
~NoRangeCallback() {}
void callback(SeqnoRange&) {}
};
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);
}
}
static std::string getStrError(Db *db) {
const size_t max_msg_len = 256;
char msg[max_msg_len];
couchstore_last_os_error(db, msg, max_msg_len);
std::string errorStr(msg);
return errorStr;
}
static std::string getSystemStrerror(void) {
std::stringstream ss;
#ifdef WIN32
char* win_msg = NULL;
DWORD err = GetLastError();
FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, err,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR) &win_msg,
0, NULL);
ss << "errno = " << err << ": '" << win_msg << "'";
LocalFree(win_msg);
#else
ss << "errno = " << errno << ": '" << strerror(errno) << "'";
#endif
return ss.str();
}
static uint8_t determine_datatype(const unsigned char* value,
size_t length) {
if (checkUTF8JSON(value, length)) {
return PROTOCOL_BINARY_DATATYPE_JSON;
} else {
return PROTOCOL_BINARY_RAW_BYTES;
}
}
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 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(Db *db, couchstore_error_t err) {
return (err == COUCHSTORE_ERROR_OPEN_FILE ||
err == COUCHSTORE_ERROR_READ ||
err == COUCHSTORE_ERROR_WRITE) ? getStrError(db) : "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;
shared_ptr<Callback<CacheLookup> > lookup;
uint16_t vbucketId;
bool keysonly;
EPStats *stats;
};
struct AllKeysCtx {
AllKeysCtx(AllKeysCB *callback, uint32_t cnt) :
cb(callback), count(cnt) { }
AllKeysCB *cb;
uint32_t count;
};
CouchRequest::CouchRequest(const Item &it, uint64_t rev,
CouchRequestCallback &cb, bool del) :
value(it.getValue()), vbucketId(it.getVBucketId()), fileRevNum(rev),
key(it.getKey()), deleteItem(del)
{
uint64_t cas = htonll(it.getCas());
uint32_t flags = it.getFlags();
uint32_t vlen = it.getNBytes();
uint32_t exptime = it.getExptime();
// Datatype used to determine whether document requires compression or not
uint8_t datatype;
// Save time of deletion in expiry time field of deleted item's metadata.
if (del) {
exptime = ep_real_time();
}
exptime = htonl(exptime);
dbDoc.id.buf = const_cast<char *>(key.c_str());
dbDoc.id.size = it.getNKey();
if (vlen) {
dbDoc.data.buf = const_cast<char *>(value->getData());
dbDoc.data.size = vlen;
datatype = it.getDataType();
} else {
dbDoc.data.buf = NULL;
dbDoc.data.size = 0;
datatype = 0x00;
}
memset(meta, 0, sizeof(meta));
memcpy(meta, &cas, 8);
memcpy(meta + 8, &exptime, 4);
memcpy(meta + 12, &flags, 4);
*(meta + DEFAULT_META_LEN) = FLEX_META_CODE;
memcpy(meta + DEFAULT_META_LEN + FLEX_DATA_OFFSET, it.getExtMeta(),
it.getExtMetaLen());
dbDocInfo.db_seq = it.getBySeqno();
dbDocInfo.rev_meta.buf = reinterpret_cast<char *>(meta);
dbDocInfo.rev_meta.size = COUCHSTORE_METADATA_SIZE;
dbDocInfo.rev_seq = it.getRevSeqno();
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 = (datatype == PROTOCOL_BINARY_DATATYPE_JSON) ?
COUCH_DOC_IS_JSON : COUCH_DOC_NON_JSON_MODE;
//Compress only those documents that aren't already compressed.
if (dbDoc.data.size > 0 && !deleteItem) {
if (datatype == PROTOCOL_BINARY_RAW_BYTES ||
datatype == PROTOCOL_BINARY_DATATYPE_JSON) {
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()), intransaction(false),
dbFileRevMapPopulated(false)
{
open();
statCollectingFileOps = getCouchstoreStatsOps(&st.fsStats);
// init db file map with default revision number, 1
numDbFiles = static_cast<uint16_t>(configuration.getMaxVbuckets());
cachedVBStates.reserve(numDbFiles);
for (uint16_t i = 0; i < numDbFiles; i++) {
// pre-allocate to avoid rehashing for safe read-only operations
dbFileRevMap.push_back(1);
cachedDocCount[i] = (size_t)-1;
cachedDeleteCount[i] = (size_t)-1;
cachedVBStates.push_back((vbucket_state *)NULL);
}
}
CouchKVStore::CouchKVStore(const CouchKVStore ©From) :
KVStore(copyFrom), epStats(copyFrom.epStats),
configuration(copyFrom.configuration),
dbname(copyFrom.dbname), dbFileRevMap(copyFrom.dbFileRevMap),
numDbFiles(copyFrom.numDbFiles),
intransaction(false),
dbFileRevMapPopulated(copyFrom.dbFileRevMapPopulated)
{
open();
statCollectingFileOps = getCouchstoreStatsOps(&st.fsStats);
}
CouchKVStore::~CouchKVStore() {
close();
for (std::vector<vbucket_state *>::iterator it = cachedVBStates.begin();
it != cachedVBStates.end(); it++) {
vbucket_state *vbstate = *it;
if (vbstate) {
delete vbstate;
*it = NULL;
}
}
}
void CouchKVStore::reset(uint16_t vbucketId) {
cb_assert(!isReadOnly());
vbucket_state *state = cachedVBStates[vbucketId];
if (state) {
state->checkpointId = 0;
state->maxDeletedSeqno = 0;
state->highSeqno = 0;
state->lastSnapStart = 0;
state->lastSnapEnd = 0;
// Unlink the couchstore file upon reset
unlinkCouchFile(vbucketId, dbFileRevMap[vbucketId]);
resetVBucket(vbucketId, *state);
updateDbFileMap(vbucketId, 1);
} else {
LOG(EXTENSION_LOG_WARNING, "No entry in cached states "
"for vbucket %u", vbucketId);
cb_assert(false);
}
}
void CouchKVStore::set(const Item &itm, Callback<mutation_result> &cb) {
cb_assert(!isReadOnly());
cb_assert(intransaction);
bool deleteItem = false;
CouchRequestCallback requestcb;
std::string dbFile;
uint64_t fileRev = dbFileRevMap[itm.getVBucketId()];
// each req will be de-allocated after commit
requestcb.setCb = &cb;
CouchRequest *req = new CouchRequest(itm, fileRev, requestcb, deleteItem);
pendingReqsQ.push_back(req);
}
void CouchKVStore::get(const std::string &key, uint64_t, uint16_t vb,
Callback<GetValue> &cb, bool fetchDelete) {
Db *db = NULL;
std::string dbFile;
GetValue rv;
uint64_t fileRev = dbFileRevMap[vb];
couchstore_error_t errCode = openDB(vb, fileRev, &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;
}
getWithHeader(db, key, vb, cb, fetchDelete);
closeDatabaseHandle(db);
}
void CouchKVStore::getWithHeader(void *dbHandle, const std::string &key,
uint16_t vb, Callback<GetValue> &cb,
bool fetchDelete) {
Db *db = (Db *)dbHandle;
hrtime_t start = gethrtime();
RememberingCallback<GetValue> *rc = dynamic_cast<RememberingCallback<GetValue> *>(&cb);
bool getMetaOnly = rc && rc->val.isPartial();
DocInfo *docInfo = NULL;
sized_buf id;
GetValue rv;
std::string dbFile;
id.size = key.size();
id.buf = const_cast<char *>(key.c_str());
couchstore_error_t 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(db, errCode).c_str());
}
} else {
cb_assert(docInfo);
errCode = fetchDoc(db, docInfo, rv, vb, getMetaOnly, fetchDelete);
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(db, 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);
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();
uint64_t fileRev = dbFileRevMap[vb];
Db *db = NULL;
couchstore_error_t errCode = openDB(vb, fileRev, &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.fetch_add(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;
}
size_t idx = 0;
sized_buf *ids = new sized_buf[itms.size()];
vb_bgfetch_queue_t::iterator itr = itms.begin();
for (; itr != itms.end(); ++itr) {
ids[idx].size = itr->first.size();
ids[idx].buf = const_cast<char *>(itr->first.c_str());
++idx;
}
GetMultiCbCtx ctx(*this, vb, itms);
errCode = couchstore_docinfos_by_id(db, ids, itms.size(),
0, getMultiCbC, &ctx);
if (errCode != COUCHSTORE_SUCCESS) {
st.numGetFailure.fetch_add(numItems);
for (itr = itms.begin(); itr != itms.end(); ++itr) {
LOG(EXTENSION_LOG_WARNING, "Warning: failed to read database by"
" vBucketId = %d key = %s file = %s error = %s [%s]\n",
vb, (*itr).first.c_str(),
dbFile.c_str(), couchstore_strerror(errCode),
couchkvstore_strerrno(db, errCode).c_str());
std::list<VBucketBGFetchItem *> &fetches = (*itr).second;
std::list<VBucketBGFetchItem *>::iterator fitr = fetches.begin();
for (; fitr != fetches.end(); ++fitr) {
(*fitr)->value.setStatus(couchErr2EngineErr(errCode));
}
}
}
closeDatabaseHandle(db);
delete []ids;
}
void CouchKVStore::del(const Item &itm,
Callback<int> &cb) {
cb_assert(!isReadOnly());
cb_assert(intransaction);
uint64_t fileRev = dbFileRevMap[itm.getVBucketId()];
CouchRequestCallback requestcb;
requestcb.delCb = &cb;
CouchRequest *req = new CouchRequest(itm, fileRev, requestcb, true);
pendingReqsQ.push_back(req);
}
void CouchKVStore::delVBucket(uint16_t vbucket) {
cb_assert(!isReadOnly());
unlinkCouchFile(vbucket, dbFileRevMap[vbucket]);
if (cachedVBStates[vbucket]) {
delete cachedVBStates[vbucket];
}
std::string failovers("[{\"id\":0, \"seq\":0}]");
cachedVBStates[vbucket] = new vbucket_state(vbucket_state_dead, 0, 0, 0, 0,
0, 0, failovers);
updateDbFileMap(vbucket, 1);
}
std::vector<vbucket_state *> CouchKVStore::listPersistedVbuckets() {
std::vector<std::string> files;
std::vector<uint16_t> vbids;
// warmup, first discover db files from local directory
discoverDbFiles(dbname, files);
populateFileNameMap(files, &vbids);
for (std::vector<vbucket_state *>::iterator it = cachedVBStates.begin();
it != cachedVBStates.end(); it++) {
vbucket_state *vbstate = *it;
if (vbstate) {
delete vbstate;
*it = NULL;
}
}
Db *db = NULL;
couchstore_error_t errorCode;
std::vector<uint16_t>::iterator itr = vbids.begin();
for (; itr != vbids.end(); ++itr) {
uint16_t id = *itr;
uint64_t rev = dbFileRevMap[id];
errorCode = openDB(id, rev, &db, COUCHSTORE_OPEN_FLAG_RDONLY);
if (errorCode == COUCHSTORE_SUCCESS) {
readVBState(db, id);
/* update stat */
++st.numLoadedVb;
closeDatabaseHandle(db);
} else {
std::stringstream revnum, vbid;
revnum << rev;
vbid << id;
std::string fileName =
dbname + "/" + vbid.str() + ".couch." + revnum.str();
LOG(EXTENSION_LOG_WARNING,
"WARN: failed to open database file, name=%s\n",
fileName.c_str());
remVBucketFromDbFileMap(id);
}
db = NULL;
removeCompactFile(dbname, id, rev);
}
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(), std::ios::binary);
session_stats.seekg(0, std::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, std::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;
}
static std::string getDBFileName(const std::string &dbname,
uint16_t vbid,
uint64_t rev) {
std::stringstream ss;
ss << dbname << "/" << vbid << ".couch." << rev;
return ss.str();
}
static int edit_docinfo_hook(DocInfo **info, const sized_buf *item) {
if ((*info)->rev_meta.size == DEFAULT_META_LEN) {
const unsigned char* data;
bool ret;
if (((*info)->content_meta | COUCH_DOC_IS_COMPRESSED) ==
(*info)->content_meta) {
size_t uncompr_len;
snappy_uncompressed_length(item->buf, item->size, &uncompr_len);
char *dbuf = (char *) malloc(uncompr_len);
snappy_uncompress(item->buf, item->size, dbuf, &uncompr_len);
data = (const unsigned char*)dbuf;
ret = checkUTF8JSON(data, uncompr_len);
free(dbuf);
} else {
data = (const unsigned char*)item->buf;
ret = checkUTF8JSON(data, item->size);
}
uint8_t flex_code = FLEX_META_CODE;
uint8_t datatype;
if (ret) {
datatype = PROTOCOL_BINARY_DATATYPE_JSON;
} else {
datatype = PROTOCOL_BINARY_RAW_BYTES;
}
DocInfo *docinfo = (DocInfo *) calloc (sizeof(DocInfo) +
(*info)->id.size +
(*info)->rev_meta.size +
FLEX_DATA_OFFSET + EXT_META_LEN,
sizeof(uint8_t));
if (!docinfo) {
LOG(EXTENSION_LOG_WARNING, "Failed to allocate docInfo, "
"while editing docinfo in the compaction's docinfo_hook");
return 0;
}
char *extra = (char *)docinfo + sizeof(DocInfo);
memcpy(extra, (*info)->id.buf, (*info)->id.size);
docinfo->id.buf = extra;
docinfo->id.size = (*info)->id.size;
extra += (*info)->id.size;
memcpy(extra, (*info)->rev_meta.buf, (*info)->rev_meta.size);
memcpy(extra + (*info)->rev_meta.size,
&flex_code, FLEX_DATA_OFFSET);
memcpy(extra + (*info)->rev_meta.size + FLEX_DATA_OFFSET,
&datatype, sizeof(uint8_t));
docinfo->rev_meta.buf = extra;
docinfo->rev_meta.size = (*info)->rev_meta.size +
FLEX_DATA_OFFSET + EXT_META_LEN;
docinfo->db_seq = (*info)->db_seq;
docinfo->rev_seq = (*info)->rev_seq;
docinfo->deleted = (*info)->deleted;
docinfo->content_meta = (*info)->content_meta;
docinfo->bp = (*info)->bp;
docinfo->size = (*info)->size;
couchstore_free_docinfo(*info);
*info = docinfo;
return 1;
}
return 0;
}
static int time_purge_hook(Db* d, DocInfo* info, void* ctx_p) {
compaction_ctx* ctx = (compaction_ctx*) ctx_p;
DbInfo infoDb;
couchstore_db_info(d, &infoDb);
//Compaction finished
if (info == NULL) {
return couchstore_set_purge_seq(d, ctx->max_purged_seq);
}
if (info->rev_meta.size >= DEFAULT_META_LEN) {
uint32_t exptime;
memcpy(&exptime, info->rev_meta.buf + 8, 4);
exptime = ntohl(exptime);
if (info->deleted) {
if (info->db_seq != infoDb.last_sequence) {
if (ctx->drop_deletes) { // all deleted items must be dropped ...
if (ctx->max_purged_seq < info->db_seq) {
ctx->max_purged_seq = info->db_seq; // track max_purged_seq
}
return COUCHSTORE_COMPACT_DROP_ITEM; // ...unconditionally
}
if (exptime < ctx->purge_before_ts &&
(!ctx->purge_before_seq ||
info->db_seq <= ctx->purge_before_seq)) {
if (ctx->max_purged_seq < info->db_seq) {
ctx->max_purged_seq = info->db_seq;
}
return COUCHSTORE_COMPACT_DROP_ITEM;
}
}
} else if (exptime && exptime < ctx->curr_time) {
std::string keyStr(info->id.buf, info->id.size);
expiredItemCtx expItem = { info->rev_seq, keyStr };
ctx->expiredItems.push_back(expItem);
}
}
return COUCHSTORE_COMPACT_KEEP_ITEM;
}
void CouchKVStore::compactVBucket(const uint16_t vbid,
compaction_ctx *hook_ctx,
Callback<compaction_ctx> &cb,
Callback<kvstats_ctx> &kvcb) {
couchstore_compact_hook hook = time_purge_hook;
couchstore_docinfo_hook dhook = edit_docinfo_hook;
const couch_file_ops *def_iops = couchstore_get_default_file_ops();
Db *compactdb = NULL;
Db *targetDb = NULL;
uint64_t fileRev = dbFileRevMap[vbid];
uint64_t new_rev = fileRev + 1;
couchstore_error_t errCode = COUCHSTORE_SUCCESS;
hrtime_t start = gethrtime();
uint64_t newHeaderPos = 0;
std::string dbfile;
std::string compact_file;
std::string new_file;
kvstats_ctx kvctx;
DbInfo info;
// Open the source VBucket database file ...
errCode = openDB(vbid, fileRev, &compactdb,
(uint64_t)COUCHSTORE_OPEN_FLAG_RDONLY, NULL);
if (errCode != COUCHSTORE_SUCCESS) {
LOG(EXTENSION_LOG_WARNING,
"Warning: failed to open database, vbucketId = %d "
"fileRev = %llu", vbid, fileRev);
return;
}
// Build the temporary vbucket.compact file name
dbfile = getDBFileName(dbname, vbid, fileRev);
compact_file = dbfile + ".compact";
// Perform COMPACTION of vbucket.couch.rev into vbucket.couch.rev.compact
errCode = couchstore_compact_db_ex(compactdb, compact_file.c_str(), 0,
hook, dhook, hook_ctx, def_iops);
if (errCode != COUCHSTORE_SUCCESS) {
LOG(EXTENSION_LOG_WARNING,
"Warning: failed to compact database with name=%s "
"error=%s errno=%s",
dbfile.c_str(),
couchstore_strerror(errCode),
couchkvstore_strerrno(compactdb, errCode).c_str());
closeDatabaseHandle(compactdb);
return;
}
// Close the source Database File once compaction is done
closeDatabaseHandle(compactdb);
// Rename the .compact file to one with the next revision number
new_file = getDBFileName(dbname, vbid, new_rev);
if (rename(compact_file.c_str(), new_file.c_str()) != 0) {
LOG(EXTENSION_LOG_WARNING,
"Warning: failed to rename '%s' to '%s': %s",
compact_file.c_str(), new_file.c_str(),
getSystemStrerror().c_str());
removeCompactFile(compact_file);
return;
}
// Open the newly compacted VBucket database file ...
errCode = openDB(vbid, new_rev, &targetDb,
(uint64_t)COUCHSTORE_OPEN_FLAG_RDONLY, NULL);
if (errCode != COUCHSTORE_SUCCESS) {
LOG(EXTENSION_LOG_WARNING,
"Warning: failed to open compacted database file %s "
"fileRev = %llu", new_file.c_str(), new_rev);
if (remove(new_file.c_str()) != 0) {
LOG(EXTENSION_LOG_WARNING, NULL,
"Warning: Failed to remove '%s': %s",
new_file.c_str(), getSystemStrerror().c_str());
}
return;
}
// Update the global VBucket file map so all operations use the new file
updateDbFileMap(vbid, new_rev);
LOG(EXTENSION_LOG_INFO,
"INFO: created new couch db file, name=%s rev=%llu",
new_file.c_str(), new_rev);
// Update stats to caller
kvctx.vbucket = vbid;
couchstore_db_info(targetDb, &info);
kvctx.fileSpaceUsed = info.space_used;
kvctx.fileSize = info.file_size;
kvcb.callback(kvctx);
// also update cached state with dbinfo
vbucket_state *state = cachedVBStates[vbid];
if (state) {
state->highSeqno = info.last_sequence;
state->purgeSeqno = info.purge_seq;
cachedDeleteCount[vbid] = info.deleted_count;
cachedDocCount[vbid] = info.doc_count;
}
// Notify MCCouch that compaction is Done...
newHeaderPos = couchstore_get_header_position(targetDb);
closeDatabaseHandle(targetDb);
if (hook_ctx->expiredItems.size()) {
cb.callback(*hook_ctx);
}
// Removing the stale couch file
unlinkCouchFile(vbid, fileRev);
st.compactHisto.add((gethrtime() - start) / 1000);
}
bool CouchKVStore::snapshotVBucket(uint16_t vbucketId, vbucket_state &vbstate,
Callback<kvstats_ctx> *cb) {
cb_assert(!isReadOnly());
vbucket_state *state = cachedVBStates[vbucketId];
if (state) {
if (state->state == vbstate.state &&
state->checkpointId == vbstate.checkpointId &&
state->failovers.compare(vbstate.failovers) == 0) {
return true; // no changes
}
state->state = vbstate.state;
state->checkpointId = vbstate.checkpointId;
state->failovers = vbstate.failovers;
// Note that max deleted seq number is maintained within CouchKVStore
vbstate.maxDeletedSeqno = state->maxDeletedSeqno;
} else {
cachedVBStates[vbucketId] = new vbucket_state(vbstate);
}
if (!setVBucketState(vbucketId, vbstate, cb)) {
LOG(EXTENSION_LOG_WARNING,
"Warning: failed to set new state, %s, for vbucket %d\n",
VBucket::toString(vbstate.state), vbucketId);
return false;
}
return true;
}
bool CouchKVStore::snapshotStats(const std::map<std::string,
std::string> &stats) {
cb_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 to "
"file \"%s\" due to IO exception \"%s\"; Not critical because new "
"stats will be dumped later, please ignore.",
next_fname.c_str(), 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,
Callback<kvstats_ctx> *kvcb) {
Db *db = NULL;
uint64_t fileRev, newFileRev;
std::stringstream id;
std::string dbFileName;
std::map<uint16_t, uint64_t>::iterator mapItr;
kvstats_ctx kvctx;
kvctx.vbucket = vbucketId;
id << vbucketId;
dbFileName = dbname + "/" + id.str() + ".couch." + id.str();
fileRev = dbFileRevMap[vbucketId];
couchstore_error_t errorCode;
errorCode = openDB(vbucketId, fileRev, &db,
(uint64_t)COUCHSTORE_OPEN_FLAG_CREATE, &newFileRev);
if (errorCode != COUCHSTORE_SUCCESS) {
++st.numVbSetFailure;
LOG(EXTENSION_LOG_WARNING,
"Warning: failed to open database, name=%s",