D20617.diff
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	diff --git a/src/infrastructure/storage/management/workflow/PhabricatorStorageManagementDumpWorkflow.php b/src/infrastructure/storage/management/workflow/PhabricatorStorageManagementDumpWorkflow.php
	--- a/src/infrastructure/storage/management/workflow/PhabricatorStorageManagementDumpWorkflow.php
	+++ b/src/infrastructure/storage/management/workflow/PhabricatorStorageManagementDumpWorkflow.php
	@@ -285,10 +285,13 @@
	$preamble = implode('', $preamble);
	$this->writeData($preamble, $file, $is_compress, $output_file);

	- $future = new ExecFuture('%C', $spec['command']);
	+ // See T13328. The "mysql" command may produce output very quickly.
	+ // Don't buffer more than a fixed amount.
	+ $future = id(new ExecFuture('%C', $spec['command']))
	+ ->setReadBufferSize(32 * 1024 * 1024);

	$iterator = id(new FutureIterator(array($future)))
	- ->setUpdateInterval(0.100);
	+ ->setUpdateInterval(0.010);
	foreach ($iterator as $ready) {
	list($stdout, $stderr) = $future->read();
	$future->discardBuffers();