fernando-wizeline commented on a change in pull request #15549:
URL: https://github.com/apache/beam/pull/15549#discussion_r826382014
##########
File path:
sdks/java/io/redis/src/main/java/org/apache/beam/sdk/io/redis/RedisIO.java
##########
@@ -334,95 +337,33 @@ public void setup() {
public void teardown() {
jedis.close();
}
- }
-
- private static class ReadKeysWithPattern extends BaseReadFn<String> {
- ReadKeysWithPattern(RedisConnectionConfiguration connectionConfiguration) {
- super(connectionConfiguration);
+ @GetInitialRestriction
+ public ByteKeyRange getInitialRestriction() {
+ return ByteKeyRange.of(ByteKey.of(0x00), ByteKey.EMPTY);
}
@ProcessElement
- public void processElement(ProcessContext c) {
+ public void processElement(
+ ProcessContext c, RestrictionTracker<ByteKeyRange, ByteKey> tracker) {
+ ByteKey cursor = tracker.currentRestriction().getStartKey();
+ RedisCursor redisCursor = RedisCursor.byteKeyToRedisCursor(cursor,
jedis.dbSize(), true);
ScanParams scanParams = new ScanParams();
scanParams.match(c.element());
-
- String cursor = ScanParams.SCAN_POINTER_START;
- boolean finished = false;
- while (!finished) {
- ScanResult<String> scanResult = jedis.scan(cursor, scanParams);
- List<String> keys = scanResult.getResult();
- for (String k : keys) {
- c.output(k);
- }
- cursor = scanResult.getCursor();
- if (cursor.equals(ScanParams.SCAN_POINTER_START)) {
- finished = true;
- }
- }
- }
- }
-
- /** A {@link DoFn} requesting Redis server to get key/value pairs. */
- private static class ReadFn extends BaseReadFn<KV<String, String>> {
- transient @Nullable Multimap<BoundedWindow, String> bundles = null;
- @Nullable AtomicInteger batchCount = null;
- private final int batchSize;
-
- ReadFn(RedisConnectionConfiguration connectionConfiguration, int
batchSize) {
- super(connectionConfiguration);
- this.batchSize = batchSize;
- }
-
- @StartBundle
- public void startBundle() {
- bundles = ArrayListMultimap.create();
- batchCount = new AtomicInteger();
- }
-
- @ProcessElement
- public void processElement(ProcessContext c, BoundedWindow window) {
- String key = c.element();
- bundles.put(window, key);
- if (batchCount.incrementAndGet() > getBatchSize()) {
- Multimap<BoundedWindow, KV<String, String>> kvs = fetchAndFlush();
- for (BoundedWindow w : kvs.keySet()) {
- for (KV<String, String> kv : kvs.get(w)) {
- c.output(kv);
- }
- }
- }
- }
-
- @FinishBundle
- public void finishBundle(FinishBundleContext context) {
- Multimap<BoundedWindow, KV<String, String>> kvs = fetchAndFlush();
- for (BoundedWindow w : kvs.keySet()) {
- for (KV<String, String> kv : kvs.get(w)) {
- context.output(kv, w.maxTimestamp(), w);
- }
- }
- }
-
- private int getBatchSize() {
- return batchSize;
- }
-
- private Multimap<BoundedWindow, KV<String, String>> fetchAndFlush() {
- Multimap<BoundedWindow, KV<String, String>> kvs =
ArrayListMultimap.create();
- for (BoundedWindow w : bundles.keySet()) {
- String[] keys = new String[bundles.get(w).size()];
- bundles.get(w).toArray(keys);
- List<String> results = jedis.mget(keys);
- for (int i = 0; i < results.size(); i++) {
- if (results.get(i) != null) {
- kvs.put(w, KV.of(keys[i], results.get(i)));
+ while (tracker.tryClaim(cursor)) {
+ ScanResult<String> scanResult = jedis.scan(redisCursor.getCursor(),
scanParams);
+ if (scanResult.getResult().size() > 0) {
+ String[] keys = scanResult.getResult().toArray(new
String[scanResult.getResult().size()]);
+ List<String> results = jedis.mget(keys);
+ for (int i = 0; i < results.size(); i++) {
+ if (results.get(i) != null) {
+ c.output(KV.of(keys[i], results.get(i)));
+ }
}
}
+ redisCursor = RedisCursor.of(scanResult.getCursor(), jedis.dbSize(),
false);
Review comment:
Yeah, that is correct, we're handling the case properly.
This is being handled by the try/claim in line 353-361, since the ByteKey
has a special case for the 0 value at the end of the cursor.
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