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https://issues.apache.org/jira/browse/BEAM-3446?focusedWorklogId=145638&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-145638
]
ASF GitHub Bot logged work on BEAM-3446:
----------------------------------------
Author: ASF GitHub Bot
Created on: 19/Sep/18 12:11
Start Date: 19/Sep/18 12:11
Worklog Time Spent: 10m
Work Description: iemejia commented on a change in pull request #5841:
[BEAM-3446] Fixes RedisIO non-prefix read operations
URL: https://github.com/apache/beam/pull/5841#discussion_r218777618
##########
File path:
sdks/java/io/redis/src/main/java/org/apache/beam/sdk/io/redis/RedisIO.java
##########
@@ -280,28 +316,77 @@ public void processElement(ProcessContext
processContext) throws Exception {
while (!finished) {
ScanResult<String> scanResult = jedis.scan(cursor, scanParams);
List<String> keys = scanResult.getResult();
-
- Pipeline pipeline = jedis.pipelined();
- if (keys != null) {
- for (String key : keys) {
- pipeline.get(key);
- }
- List<Object> values = pipeline.syncAndReturnAll();
- for (int i = 0; i < values.size(); i++) {
- processContext.output(KV.of(keys.get(i), (String) values.get(i)));
- }
+ for (String k : keys) {
+ processContext.output(k);
}
-
cursor = scanResult.getStringCursor();
if ("0".equals(cursor)) {
finished = true;
}
}
}
+ }
+ /** A {@link DoFn} requesting Redis server to get key/value pairs. */
+ private static class ReadFn extends BaseReadFn<KV<String, String>> {
+ @Nullable transient Multimap<BoundedWindow, String> bundles = null;
+ @Nullable AtomicInteger batchCount = null;
+ private final int batchSize;
+
+ @StartBundle
+ public void startBundle(StartBundleContext context) {
+ bundles = ArrayListMultimap.create();
+ batchCount = new AtomicInteger();
+ }
- @Teardown
- public void teardown() {
- jedis.close();
+ ReadFn(RedisConnectionConfiguration connectionConfiguration, int
batchSize) {
+ super(connectionConfiguration);
+ this.batchSize = batchSize;
+ }
+
+ private int getBatchSize() {
+ return batchSize;
+ }
+
+ @ProcessElement
+ public void processElement(ProcessContext processContext, BoundedWindow
window)
+ throws Exception {
+ String key = processContext.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)) {
+ processContext.output(kv);
+ }
+ }
+ }
+ }
+
+ 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)));
+ }
+ }
+ }
+ bundles = ArrayListMultimap.create();
+ batchCount.set(0);
+ return kvs;
+ }
+
+ @FinishBundle
+ public void finishBundle(FinishBundleContext context) throws Exception {
+ Multimap<BoundedWindow, KV<String, String>> kvs = fetchAndFlush();
Review comment:
Thanks for answering, I have somehow misread the `startBundle` as a setup
only method. I see how everything fits now.
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Issue Time Tracking
-------------------
Worklog Id: (was: 145638)
Time Spent: 5h 50m (was: 5h 40m)
> RedisIO non-prefix read operations
> ----------------------------------
>
> Key: BEAM-3446
> URL: https://issues.apache.org/jira/browse/BEAM-3446
> Project: Beam
> Issue Type: New Feature
> Components: io-java-redis
> Reporter: Vinay varma
> Assignee: Vinay varma
> Priority: Major
> Time Spent: 5h 50m
> Remaining Estimate: 0h
>
> Read operation in RedisIO is for prefix based look ups. While this can be
> used for exact key matches as well, the number of operations limits the
> through put of the function.
> I suggest exposing current readAll operation as readbyprefix and using more
> simpler operations for readAll functionality.
> ex:
> {code:java}
> String output = jedis.get(element);
> if (output != null) {
> processContext.output(KV.of(element, output));
> }
> {code}
> instead of:
> https://github.com/apache/beam/blob/7d240c0bb171af6868f1a6e95196c9dcfc9ac640/sdks/java/io/redis/src/main/java/org/apache/beam/sdk/io/redis/RedisIO.java#L292
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