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https://issues.apache.org/jira/browse/BEAM-3446?focusedWorklogId=120839&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-120839
]
ASF GitHub Bot logged work on BEAM-3446:
----------------------------------------
Author: ASF GitHub Bot
Created on: 09/Jul/18 16:13
Start Date: 09/Jul/18 16:13
Worklog Time Spent: 10m
Work Description: vvarma commented on a change in pull request #5841:
Fixes https://issues.apache.org/jira/browse/BEAM-3446.
URL: https://github.com/apache/beam/pull/5841#discussion_r201061427
##########
File path:
sdks/java/io/redis/src/main/java/org/apache/beam/sdk/io/redis/RedisIO.java
##########
@@ -279,28 +290,31 @@ 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>> {
- @Teardown
- public void teardown() {
- jedis.close();
+ ReadFn(RedisConnectionConfiguration connectionConfiguration) {
+ super(connectionConfiguration);
+ }
+
+ @ProcessElement
+ public void processElement(ProcessContext processContext) throws Exception
{
+ String key = processContext.element();
+
+ String value = jedis.get(key);
Review comment:
@iemejia right now there are two operators exposed for read operations
1. ReadKeysWithPattern - which is 2 stepped - a ) for each pattern prefix in
the PCollection fetch all matching keys b) fetch values for each key
2. ReadFn - which gets values for each key in the PCollection.
I can make changes to ReadKeysWithPattern to use a parameterized batch to
fetch the data in the b step, but for ReadFn I am not sure of how to use the
batch parameter.
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Issue Time Tracking
-------------------
Worklog Id: (was: 120839)
Time Spent: 3h (was: 2h 50m)
> 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
> 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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