@Override
            public ByteBuffer call() throws Exception {
                try {
                    StoreFileChunk result = fileStore.readStoreFileChunkFromDisk(testFile.getName(), offset, 2, false);
                    latch.countDown();
                    return result.toBuffer();
                } catch (Exception e) {
                    throw e;
                }
            }
Tests concurrent file read operations.
Verifies:
- Multiple threads can read simultaneously
- Each thread gets correct data
- System handles concurrent access efficiently

@throws Exception if concurrent operations fail
ambry-store/src/test/java/com/github/ambry/store/FileStoreTest.java