ndimiduk commented on code in PR #6167:
URL: https://github.com/apache/hbase/pull/6167#discussion_r1740969491
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hbase-client/src/main/java/org/apache/hadoop/hbase/client/RawAsyncTableImpl.java:
##########
@@ -92,6 +95,11 @@ class RawAsyncTableImpl implements
AsyncTable<AdvancedScanResultConsumer> {
private static final Logger LOG =
LoggerFactory.getLogger(RawAsyncTableImpl.class);
+ private static final HashedWheelTimer HWT = new HashedWheelTimer(
Review Comment:
Is there an existing HWT that can be used for this purpose? Maybe something
tied to the Connection?
##########
hbase-endpoint/src/main/java/org/apache/hadoop/hbase/client/coprocessor/AsyncAggregationClient.java:
##########
@@ -106,6 +126,31 @@ public synchronized void onComplete() {
finished = true;
future.complete(getFinalResult());
}
+
+ @Override
+ public ServiceCaller<AggregateService, AggregateResponse>
+ getNextCallable(AggregateResponse response, RegionInfo region) {
+ if (!response.hasNextChunkStartRow()) {
+ return null;
+ }
+ return (stub, controller, rpcCallback) -> {
+ AggregateRequest.Builder updatedRequest =
AggregateRequest.newBuilder(originalRequest);
+ updatedRequest.setScan(originalRequest.getScan().toBuilder()
+ .setStartRow(response.getNextChunkStartRow()).build());
+ if (log.isTraceEnabled()) {
+ log.trace("Got incomplete result {} for original scan {}. Sending
new request {}.",
Review Comment:
nit: "sending _next_ request" ?
That is, this is considered to be part of the happy path, it is the case
that an aggregation request can span multiple RPCs, so it's not a "new as in
replacement" request, but a "new as in next in the chain of indeterminant
length" request, right?
##########
hbase-endpoint/src/main/java/org/apache/hadoop/hbase/client/coprocessor/AsyncAggregationClient.java:
##########
@@ -131,32 +175,38 @@ private static byte[] nullToEmpty(byte[] b) {
CompletableFuture<R> future = new CompletableFuture<>();
AggregateRequest req;
try {
- req = validateArgAndGetPB(scan, ci, false);
+ req = validateArgAndGetPB(scan, ci, false, true);
} catch (IOException e) {
future.completeExceptionally(e);
return future;
}
- AbstractAggregationCallback<R> callback = new
AbstractAggregationCallback<R>(future) {
+ AbstractAggregationCallback<R> callback =
+ new AbstractAggregationCallback<>(future, req, AggregateService::getMax)
{
- private R max;
+ private R max;
+ private final Object lock = new Object();
Review Comment:
if multiple threads need to coordinate on retrieving this value, should they
be synchronising on a final result? As in, should `getFinalResult` block on
completion of a future Future instead of simply locking around accesses of
`max` ?
##########
hbase-client/src/main/java/org/apache/hadoop/hbase/client/RawAsyncTableImpl.java:
##########
@@ -822,7 +830,30 @@ private <S, R> void onLocateComplete(Function<RpcChannel,
S> stubMaker,
} else {
callback.onRegionComplete(region, r);
}
- if (unfinishedRequest.decrementAndGet() == 0 && locateFinished.get()) {
+
+ boolean complete = unfinishedRequest.decrementAndGet() == 0 &&
locateFinished.get();
+
+ if (e == null && r != null) {
+ ServiceCaller<S, R> updatedCallable = callback.getNextCallable(r,
region);
+ if (updatedCallable != null) {
+ // We are launching a new request now, so un-set complete
+ complete = false;
+ long waitIntervalMs = callback.getWaitIntervalMs(r, region);
+ LOG.trace("Coprocessor returned incomplete result. "
+ + "Sleeping for {} millis before making follow-up request.",
waitIntervalMs);
+ if (waitIntervalMs > 0) {
+ HWT.newTimeout(
+ (timeout) -> onLocateComplete(stubMaker, updatedCallable,
callback, endKey,
+ endKeyInclusive, locateFinished, unfinishedRequest, loc,
null),
+ waitIntervalMs, TimeUnit.MILLISECONDS);
+ } else {
+ onLocateComplete(stubMaker, updatedCallable, callback, endKey,
endKeyInclusive,
+ locateFinished, unfinishedRequest, loc, null);
+ }
+ }
Review Comment:
I'm not very familiar with the Netty call-back code. This listener invokes
again the `onLocateComplete` method, which effectively makes this call
recursive? In that case, does it mean that the `if(complete)` body below will
be potentially invoked multiple times as listeners are popped off the stack?
That is, when `updatedCallable != null`, should the end of this if-block exit
early, rather than executing all the way through to checking for completeness?
Oh. Right. You set `complete = false` inside this block, so that even when
control flow gets down there, nothing happens. I think this would be less
confusing if the method exited after calling `onLocateComplete` rather than
letting control continue through the end of the method.
I dunno. Take this comment with a grain of salt.
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