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fix: Fix a possible NULL PTR after introduced timeout on waitForDone #1638

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merged 8 commits into from
May 4, 2022
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fix: Fix a possible NULL PTR after introduced timeout on waitForDone #1638

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fix: Fix a possible nullptr error when requestCallback is called afte…
yirutang May 3, 2022
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yirutang May 3, 2022
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update the structure
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22 changes: 16 additions & 6 deletions ...loud-bigquerystorage/src/main/java/com/google/cloud/bigquery/storage/v1/StreamWriter.java
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Original file line number Diff line number Diff line change
Expand Up @@ -465,7 +465,7 @@ private void appendLoop() {
// We can close the stream connection and handle the remaining inflight requests.
if (streamConnection != null) {
this.streamConnection.close();
waitForDoneCallback(1, TimeUnit.MINUTES);
waitForDoneCallback(2, TimeUnit.MINUTES);
}

// At this point, there cannot be more callback. It is safe to clean up all inflight requests.
Expand Down Expand Up @@ -573,6 +573,9 @@ private void requestCallback(AppendRowsResponse response) {
conectionRetryCountWithoutCallback = 0;
}
requestWrapper = pollInflightRequestQueue();
if (requestWrapper == null) {
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If we haven't cleaned up and this happens, we should throw an exception

Maybe instead of using null, check if we've cleaned up, and don't call the method (since this is under lock anyways)?

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If we have cleaned up, then all inflight requests are all set with an exception already.
I don't think we should throw on requestCallback?

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I meant the opposite: if we haven't cleaned up.

If during normal operations we get a callback but there's nothing in the queue, that should never happen, so we should throw (or somehow error out)

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Updated the code, hope it is more straightforward.

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@gnanda gnanda May 3, 2022 •
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Yeah it is, but I was thinking we'd also have

doneCallback {
this.done = true;
}

and for your change in requestCallback:
if (!this.done && this.inflightRequestQueue.isEmpty()) {
// Handle this error case!
}

But since it's in the callback, that's probably more complicated than I originally thought... Should we handle that in a followup?

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PTAL

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There is no super good place for done, since the lock is done inside of the cleanupInflightQueue.

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Added an error message, without a response, user will probably not be able to get the actual exception.

return;
}
} finally {
this.lock.unlock();
}
Expand Down Expand Up @@ -640,11 +643,18 @@ private void doneCallback(Throwable finalStatus) {

@GuardedBy("lock")
private AppendRequestAndResponse pollInflightRequestQueue() {
AppendRequestAndResponse requestWrapper = this.inflightRequestQueue.pollFirst();
--this.inflightRequests;
this.inflightBytes -= requestWrapper.messageSize;
this.inflightReduced.signal();
return requestWrapper;
if (!this.inflightRequestQueue.isEmpty()) {
AppendRequestAndResponse requestWrapper = this.inflightRequestQueue.pollFirst();
--this.inflightRequests;
this.inflightBytes -= requestWrapper.messageSize;
this.inflightReduced.signal();
return requestWrapper;
} else {
// It is possible when requestCallback is called, the inflight queue is already drained to do
// timeout waiting
// for done.
return null;
}
}

/**
Expand Down