LakshSingla commented on code in PR #13062:
URL: https://github.com/apache/druid/pull/13062#discussion_r974231888
##########
extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/shuffle/DurableStorageInputChannelFactory.java:
##########
@@ -112,11 +118,59 @@ public ReadableFrameChannel openChannel(StageId stageId,
int workerNumber, int p
catch (Exception e) {
throw new IOE(
e,
- "Could not find remote output of worker task[%s] stage[%d]
partition[%d]",
- workerTaskId,
+ "Could not find remote output of worker task[%d] stage[%d]
partition[%d]",
+ workerNumber,
stageId.getStageNumber(),
partitionNumber
);
}
}
+
+ /**
+ * Given an input worker number, stage number and the partition number, this
method figures out the exact location
+ * where the outputs would be present in the durable storage and returns the
complete path or throws an exception
+ * if no such file exists in the durable storage
+ * More information at {@link
DurableStorageOutputChannelFactory#createSuccessFile(String)}
+ */
+ public String findSuccessfulPartitionOutput(
+ final String controllerTaskId,
+ final int workerNo,
+ final int stageNumber,
+ final int partitionNumber
+ ) throws IOException
+ {
+ String successfulFilePath = DurableStorageUtils.getSuccessFilePath(
+ controllerTaskId,
+ stageNumber,
+ workerNo
+ );
+
+ if (!storageConnector.pathExists(successfulFilePath)) {
+ throw new ISE(
+ "No file present at the location [%s]. Unable to read the inputs for
worker: [%d], stage: [%d], partition: [%d]",
+ successfulFilePath,
+ workerNo,
+ stageNumber,
+ partitionNumber
+ );
+ }
+
+ String successfulTaskId;
+
+ try (InputStream is = storageConnector.read(successfulFilePath)) {
+ // TODO: Check if this call can block indefinitely
+ successfulTaskId = IOUtils.toString(is, StandardCharsets.UTF_8);
Review Comment:
Need a review on this, and if it can potentially block the output.
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