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https://issues.apache.org/jira/browse/BEAM-3446?focusedWorklogId=127715&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-127715
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ASF GitHub Bot logged work on BEAM-3446:
----------------------------------------
Author: ASF GitHub Bot
Created on: 26/Jul/18 09:38
Start Date: 26/Jul/18 09:38
Worklog Time Spent: 10m
Work Description: vvarma 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_r205392609
##########
File path:
sdks/java/io/redis/src/main/java/org/apache/beam/sdk/io/redis/RedisIO.java
##########
@@ -279,28 +314,73 @@ 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>> {
+ private int batchSize;
+ private List<String> bufferedKeys;
+ BoundedWindow window;
+ Instant lastMsg;
+
+ @StartBundle
+ public void startBundle(StartBundleContext context) {
+ bufferedKeys = new ArrayList<>();
+ }
- @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();
+ bufferedKeys.add(key);
+ this.window = window;
+ this.lastMsg = processContext.timestamp();
+ if (bufferedKeys.size() > getBatchSize()) {
+ List<KV<String, String>> kvs = fetchAndFlush();
+ for (KV<String, String> kv : kvs) {
+ processContext.output(kv);
+ }
+ }
+ }
+
+ private List<KV<String, String>> fetchAndFlush() {
+ String[] keys = new String[bufferedKeys.size()];
+ bufferedKeys.toArray(keys);
+ List<String> results = jedis.mget(keys);
+ assert bufferedKeys.size() == results.size();
+ List<KV<String, String>> kvs = new ArrayList<>(bufferedKeys.size());
+ for (int i = 0; i < bufferedKeys.size(); i++) {
+ if (results.get(i) != null) {
+ kvs.add(KV.of(bufferedKeys.get(i), results.get(i)));
+ }
+ }
+ bufferedKeys = new ArrayList<>();
+ return kvs;
+ }
+
+ @FinishBundle
+ public void finishBundle(FinishBundleContext context) throws Exception {
+ List<KV<String, String>> kvs = fetchAndFlush();
+ for (KV<String, String> kv : kvs) {
+ context.output(kv, lastMsg, window);
Review comment:
Though here, messages with the same window are being bundled together,
stored and finally processed in the finishBundle.
In the case of ReadFn, the idea was to buffer requests till the batch size
and process them at that time. Hence the output is pushed in both
processElement method as well as finishBundle.
Not sure if I understand how to use a map with window as the key.
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Issue Time Tracking
-------------------
Worklog Id: (was: 127715)
Time Spent: 3h 50m (was: 3h 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: 3h 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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