/** @return Nodes to execute on. */
private Collection<ClusterNode> nodes() {
CacheMode cacheMode = cctx.config().getCacheMode();
switch (cacheMode) {
case LOCAL:
if (prj != null)
U.warn(
log,
"Ignoring query projection because it's executed over LOCAL cache "
+ "(only local node will be queried): "
+ this);
return Collections.singletonList(cctx.localNode());
case REPLICATED:
if (prj != null || partition() != null) return nodes(cctx, prj, partition());
return cctx.affinityNode()
? Collections.singletonList(cctx.localNode())
: Collections.singletonList(F.rand(nodes(cctx, null, partition())));
case PARTITIONED:
return nodes(cctx, prj, partition());
default:
throw new IllegalStateException("Unknown cache distribution mode: " + cacheMode);
}
}
/**
* Calculates partition mapping for partitioned cache on unstable topology.
*
* @param cctx Cache context for main space.
* @param extraSpaces Extra spaces.
* @return Partition mapping or {@code null} if we can't calculate it due to repartitioning and we
* need to retry.
*/
@SuppressWarnings("unchecked")
private Map<ClusterNode, IntArray> partitionedUnstableDataNodes(
final GridCacheContext<?, ?> cctx, List<String> extraSpaces) {
assert !cctx.isReplicated() && !cctx.isLocal() : cctx.name() + " must be partitioned";
final int partsCnt = cctx.affinity().partitions();
if (extraSpaces != null) { // Check correct number of partitions for partitioned caches.
for (String extraSpace : extraSpaces) {
GridCacheContext<?, ?> extraCctx = cacheContext(extraSpace);
if (extraCctx.isReplicated() || extraCctx.isLocal()) continue;
int parts = extraCctx.affinity().partitions();
if (parts != partsCnt)
throw new CacheException(
"Number of partitions must be the same for correct collocation [cache1="
+ cctx.name()
+ ", parts1="
+ partsCnt
+ ", cache2="
+ extraSpace
+ ", parts2="
+ parts
+ "]");
}
}
Set<ClusterNode>[] partLocs = new Set[partsCnt];
// Fill partition locations for main cache.
for (int p = 0, parts = cctx.affinity().partitions(); p < parts; p++) {
List<ClusterNode> owners = cctx.topology().owners(p);
if (F.isEmpty(owners)) {
if (!F.isEmpty(dataNodes(cctx.name(), NONE))) return null; // Retry.
throw new CacheException(
"Failed to find data nodes [cache=" + cctx.name() + ", part=" + p + "]");
}
partLocs[p] = new HashSet<>(owners);
}
if (extraSpaces != null) {
// Find owner intersections for each participating partitioned cache partition.
// We need this for logical collocation between different partitioned caches with the same
// affinity.
for (String extraSpace : extraSpaces) {
GridCacheContext<?, ?> extraCctx = cacheContext(extraSpace);
if (extraCctx.isReplicated() || extraCctx.isLocal()) continue;
for (int p = 0, parts = extraCctx.affinity().partitions(); p < parts; p++) {
List<ClusterNode> owners = extraCctx.topology().owners(p);
if (F.isEmpty(owners)) {
if (!F.isEmpty(dataNodes(extraSpace, NONE))) return null; // Retry.
throw new CacheException(
"Failed to find data nodes [cache=" + extraSpace + ", part=" + p + "]");
}
if (partLocs[p] == null) partLocs[p] = new HashSet<>(owners);
else {
partLocs[p].retainAll(owners); // Intersection of owners.
if (partLocs[p].isEmpty()) return null; // Intersection is empty -> retry.
}
}
}
// Filter nodes where not all the replicated caches loaded.
for (String extraSpace : extraSpaces) {
GridCacheContext<?, ?> extraCctx = cacheContext(extraSpace);
if (!extraCctx.isReplicated()) continue;
Set<ClusterNode> dataNodes = replicatedUnstableDataNodes(extraCctx);
if (F.isEmpty(dataNodes)) return null; // Retry.
for (Set<ClusterNode> partLoc : partLocs) {
partLoc.retainAll(dataNodes);
if (partLoc.isEmpty()) return null; // Retry.
}
}
}
// Collect the final partitions mapping.
Map<ClusterNode, IntArray> res = new HashMap<>();
// Here partitions in all IntArray's will be sorted in ascending order, this is important.
for (int p = 0; p < partLocs.length; p++) {
Set<ClusterNode> pl = partLocs[p];
assert !F.isEmpty(pl) : pl;
ClusterNode n = pl.size() == 1 ? F.first(pl) : F.rand(pl);
IntArray parts = res.get(n);
if (parts == null) res.put(n, parts = new IntArray());
parts.add(p);
}
return res;
}
/**
* @param cctx Cache context.
* @param qry Query.
* @param keepPortable Keep portable.
* @return Cursor.
*/
public Iterator<List<?>> query(
GridCacheContext<?, ?> cctx, GridCacheTwoStepQuery qry, boolean keepPortable) {
for (int attempt = 0; ; attempt++) {
if (attempt != 0) {
try {
Thread.sleep(attempt * 10); // Wait for exchange.
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new CacheException("Query was interrupted.", e);
}
}
long qryReqId = reqIdGen.incrementAndGet();
QueryRun r = new QueryRun();
r.pageSize = qry.pageSize() <= 0 ? GridCacheTwoStepQuery.DFLT_PAGE_SIZE : qry.pageSize();
r.idxs = new ArrayList<>(qry.mapQueries().size());
String space = cctx.name();
r.conn = (JdbcConnection) h2.connectionForSpace(space);
AffinityTopologyVersion topVer = h2.readyTopologyVersion();
List<String> extraSpaces = extraSpaces(space, qry.spaces());
Collection<ClusterNode> nodes;
// Explicit partition mapping for unstable topology.
Map<ClusterNode, IntArray> partsMap = null;
if (isPreloadingActive(cctx, extraSpaces)) {
if (cctx.isReplicated()) nodes = replicatedUnstableDataNodes(cctx, extraSpaces);
else {
partsMap = partitionedUnstableDataNodes(cctx, extraSpaces);
nodes = partsMap == null ? null : partsMap.keySet();
}
} else nodes = stableDataNodes(topVer, cctx, extraSpaces);
if (nodes == null) continue; // Retry.
assert !nodes.isEmpty();
if (cctx.isReplicated() || qry.explain()) {
assert qry.explain() || !nodes.contains(ctx.discovery().localNode())
: "We must be on a client node.";
// Select random data node to run query on a replicated data or get EXPLAIN PLAN from a
// single node.
nodes = Collections.singleton(F.rand(nodes));
}
int tblIdx = 0;
final boolean skipMergeTbl = !qry.explain() && qry.skipMergeTable();
for (GridCacheSqlQuery mapQry : qry.mapQueries()) {
GridMergeIndex idx;
if (!skipMergeTbl) {
GridMergeTable tbl;
try {
tbl = createMergeTable(r.conn, mapQry, qry.explain());
} catch (IgniteCheckedException e) {
throw new IgniteException(e);
}
idx = tbl.getScanIndex(null);
fakeTable(r.conn, tblIdx++).setInnerTable(tbl);
} else idx = GridMergeIndexUnsorted.createDummy();
for (ClusterNode node : nodes) idx.addSource(node.id());
r.idxs.add(idx);
}
r.latch = new CountDownLatch(r.idxs.size() * nodes.size());
runs.put(qryReqId, r);
try {
if (ctx.clientDisconnected()) {
throw new CacheException(
"Query was cancelled, client node disconnected.",
new IgniteClientDisconnectedException(
ctx.cluster().clientReconnectFuture(), "Client node disconnected."));
}
Collection<GridCacheSqlQuery> mapQrys = qry.mapQueries();
if (qry.explain()) {
mapQrys = new ArrayList<>(qry.mapQueries().size());
for (GridCacheSqlQuery mapQry : qry.mapQueries())
mapQrys.add(new GridCacheSqlQuery("EXPLAIN " + mapQry.query(), mapQry.parameters()));
}
if (nodes.size() != 1 || !F.first(nodes).isLocal()) { // Marshall params for remotes.
Marshaller m = ctx.config().getMarshaller();
for (GridCacheSqlQuery mapQry : mapQrys) mapQry.marshallParams(m);
}
boolean retry = false;
if (send(
nodes,
new GridQueryRequest(qryReqId, r.pageSize, space, mapQrys, topVer, extraSpaces, null),
partsMap)) {
awaitAllReplies(r, nodes);
Object state = r.state.get();
if (state != null) {
if (state instanceof CacheException) {
CacheException err = (CacheException) state;
if (err.getCause() instanceof IgniteClientDisconnectedException) throw err;
throw new CacheException("Failed to run map query remotely.", err);
}
if (state instanceof AffinityTopologyVersion) {
retry = true;
// If remote node asks us to retry then we have outdated full partition map.
h2.awaitForReadyTopologyVersion((AffinityTopologyVersion) state);
}
}
} else // Send failed.
retry = true;
Iterator<List<?>> resIter = null;
if (!retry) {
if (qry.explain()) return explainPlan(r.conn, space, qry);
if (skipMergeTbl) {
List<List<?>> res = new ArrayList<>();
assert r.idxs.size() == 1 : r.idxs;
GridMergeIndex idx = r.idxs.get(0);
Cursor cur = idx.findInStream(null, null);
while (cur.next()) {
Row row = cur.get();
int cols = row.getColumnCount();
List<Object> resRow = new ArrayList<>(cols);
for (int c = 0; c < cols; c++) resRow.add(row.getValue(c).getObject());
res.add(resRow);
}
resIter = res.iterator();
} else {
GridCacheSqlQuery rdc = qry.reduceQuery();
// Statement caching is prohibited here because we can't guarantee correct merge index
// reuse.
ResultSet res =
h2.executeSqlQueryWithTimer(
space, r.conn, rdc.query(), F.asList(rdc.parameters()), false);
resIter = new Iter(res);
}
}
for (GridMergeIndex idx : r.idxs) {
if (!idx.fetchedAll()) // We have to explicitly cancel queries on remote nodes.
send(nodes, new GridQueryCancelRequest(qryReqId), null);
}
if (retry) {
if (Thread.currentThread().isInterrupted())
throw new IgniteInterruptedCheckedException("Query was interrupted.");
continue;
}
return new GridQueryCacheObjectsIterator(resIter, cctx, keepPortable);
} catch (IgniteCheckedException | RuntimeException e) {
U.closeQuiet(r.conn);
if (e instanceof CacheException) throw (CacheException) e;
Throwable cause = e;
if (e instanceof IgniteCheckedException) {
Throwable disconnectedErr =
((IgniteCheckedException) e).getCause(IgniteClientDisconnectedException.class);
if (disconnectedErr != null) cause = disconnectedErr;
}
throw new CacheException("Failed to run reduce query locally.", cause);
} finally {
if (!runs.remove(qryReqId, r)) U.warn(log, "Query run was already removed: " + qryReqId);
if (!skipMergeTbl) {
for (int i = 0, mapQrys = qry.mapQueries().size(); i < mapQrys; i++)
fakeTable(null, i).setInnerTable(null); // Drop all merge tables.
}
}
}
}