Local Cache with large page size cause Out of heap memory

Alluxio Version: Dora branch - 2.10.0-SNAPSHOT

Describe the bug Local cache hit read is zero copy. Local cache with FUSE SDK read is double copy at least:

byte[] page = LocalCacheFileInStream.readExternalPage(position, readType);

• UfsFileInStream.create()
• UfsFileInStream.seek()
• byte[] page = new byte[pageSize]; ← first copy, full page size = 512MB
• ByteBuffer.wrap(page)
• UfsFileInStream.read(ByteBuffer)
• • byte[] byteArray = new byte[len]; <-- second copy, full page size = 512MB
• • read(byte[] b, int off, int len)

To Reproduce Change page size to 512MB launch Fuse SDK with local cache Run FIO big file read: fio --name=sequentialread --rw=read --bs=4m --numjobs=1 --filesize=1g -direct=1 --group_reporting --nrfiles 1

read failed because out of heap memory

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