/**
* Creates the calls and submit them
*
* @param cs - the completion service to use for submitting
* @param rl - the region locations
* @param min - the id of the first replica, inclusive
* @param max - the id of the last replica, inclusive.
*/
private void addCallsForReplica(
ResultBoundedCompletionService<Result> cs, RegionLocations rl, int min, int max) {
for (int id = min; id <= max; id++) {
HRegionLocation hrl = rl.getRegionLocation(id);
ReplicaRegionServerCallable callOnReplica = new ReplicaRegionServerCallable(id, hrl);
cs.submit(callOnReplica, callTimeout, id);
}
}
/**
* Two responsibilities - if the call is already completed (by another replica) stops the
* retries. - set the location to the right region, depending on the replica.
*/
@Override
public void prepare(final boolean reload) throws IOException {
if (controller.isCanceled()) return;
if (Thread.interrupted()) {
throw new InterruptedIOException();
}
if (reload || location == null) {
RegionLocations rl = getRegionLocations(false, id, cConnection, tableName, get.getRow());
location = id < rl.size() ? rl.getRegionLocation(id) : null;
}
if (location == null || location.getServerName() == null) {
// With this exception, there will be a retry. The location can be null for a replica
// when the table is created or after a split.
throw new HBaseIOException("There is no location for replica id #" + id);
}
ServerName dest = location.getServerName();
setStub(cConnection.getClient(dest));
}
public void append(
TableName tableName, byte[] encodedRegionName, byte[] row, List<Entry> entries)
throws IOException {
if (disabledAndDroppedTables.getIfPresent(tableName) != null) {
if (LOG.isTraceEnabled()) {
LOG.trace(
"Skipping "
+ entries.size()
+ " entries because table "
+ tableName
+ " is cached as a disabled or dropped table");
for (Entry entry : entries) {
LOG.trace("Skipping : " + entry);
}
}
sink.getSkippedEditsCounter().addAndGet(entries.size());
return;
}
// If the table is disabled or dropped, we should not replay the entries, and we can skip
// replaying them. However, we might not know whether the table is disabled until we
// invalidate the cache and check from meta
RegionLocations locations = null;
boolean useCache = true;
while (true) {
// get the replicas of the primary region
try {
locations =
RegionReplicaReplayCallable.getRegionLocations(
connection, tableName, row, useCache, 0);
if (locations == null) {
throw new HBaseIOException(
"Cannot locate locations for " + tableName + ", row:" + Bytes.toStringBinary(row));
}
} catch (TableNotFoundException e) {
if (LOG.isTraceEnabled()) {
LOG.trace(
"Skipping "
+ entries.size()
+ " entries because table "
+ tableName
+ " is dropped. Adding table to cache.");
for (Entry entry : entries) {
LOG.trace("Skipping : " + entry);
}
}
disabledAndDroppedTables.put(tableName, Boolean.TRUE); // put to cache. Value ignored
// skip this entry
sink.getSkippedEditsCounter().addAndGet(entries.size());
return;
}
// check whether we should still replay this entry. If the regions are changed, or the
// entry is not coming from the primary region, filter it out.
HRegionLocation primaryLocation = locations.getDefaultRegionLocation();
if (!Bytes.equals(
primaryLocation.getRegionInfo().getEncodedNameAsBytes(), encodedRegionName)) {
if (useCache) {
useCache = false;
continue; // this will retry location lookup
}
if (LOG.isTraceEnabled()) {
LOG.trace(
"Skipping "
+ entries.size()
+ " entries in table "
+ tableName
+ " because located region "
+ primaryLocation.getRegionInfo().getEncodedName()
+ " is different than the original region "
+ Bytes.toStringBinary(encodedRegionName)
+ " from WALEdit");
for (Entry entry : entries) {
LOG.trace("Skipping : " + entry);
}
}
sink.getSkippedEditsCounter().addAndGet(entries.size());
return;
}
break;
}
if (locations.size() == 1) {
return;
}
ArrayList<Future<ReplicateWALEntryResponse>> tasks =
new ArrayList<Future<ReplicateWALEntryResponse>>(locations.size() - 1);
// All passed entries should belong to one region because it is coming from the EntryBuffers
// split per region. But the regions might split and merge (unlike log recovery case).
for (int replicaId = 0; replicaId < locations.size(); replicaId++) {
HRegionLocation location = locations.getRegionLocation(replicaId);
if (!RegionReplicaUtil.isDefaultReplica(replicaId)) {
HRegionInfo regionInfo =
location == null
? RegionReplicaUtil.getRegionInfoForReplica(
locations.getDefaultRegionLocation().getRegionInfo(), replicaId)
: location.getRegionInfo();
RegionReplicaReplayCallable callable =
new RegionReplicaReplayCallable(
connection,
rpcControllerFactory,
tableName,
location,
regionInfo,
row,
entries,
sink.getSkippedEditsCounter());
Future<ReplicateWALEntryResponse> task =
pool.submit(
new RetryingRpcCallable<ReplicateWALEntryResponse>(
rpcRetryingCallerFactory, callable, operationTimeout));
tasks.add(task);
}
}
boolean tasksCancelled = false;
for (Future<ReplicateWALEntryResponse> task : tasks) {
try {
task.get();
} catch (InterruptedException e) {
throw new InterruptedIOException(e.getMessage());
} catch (ExecutionException e) {
Throwable cause = e.getCause();
if (cause instanceof IOException) {
// The table can be disabled or dropped at this time. For disabled tables, we have no
// cheap mechanism to detect this case because meta does not contain this information.
// HConnection.isTableDisabled() is a zk call which we cannot do for every replay RPC.
// So instead we start the replay RPC with retries and
// check whether the table is dropped or disabled which might cause
// SocketTimeoutException, or RetriesExhaustedException or similar if we get IOE.
if (cause instanceof TableNotFoundException || connection.isTableDisabled(tableName)) {
if (LOG.isTraceEnabled()) {
LOG.trace(
"Skipping "
+ entries.size()
+ " entries in table "
+ tableName
+ " because received exception for dropped or disabled table",
cause);
for (Entry entry : entries) {
LOG.trace("Skipping : " + entry);
}
}
disabledAndDroppedTables.put(tableName, Boolean.TRUE); // put to cache for later.
if (!tasksCancelled) {
sink.getSkippedEditsCounter().addAndGet(entries.size());
tasksCancelled = true; // so that we do not add to skipped counter again
}
continue;
}
// otherwise rethrow
throw (IOException) cause;
}
// unexpected exception
throw new IOException(cause);
}
}
}