rbalamohan commented on a change in pull request #152:
URL: https://github.com/apache/tez/pull/152#discussion_r732529927
##########
File path:
tez-dag/src/main/java/org/apache/tez/dag/app/dag/impl/TaskAttemptImpl.java
##########
@@ -1793,80 +1793,107 @@ public TaskAttemptStateInternal
transition(TaskAttemptImpl attempt, TaskAttemptE
MultipleArcTransition<TaskAttemptImpl, TaskAttemptEvent,
TaskAttemptStateInternal> {
@Override
- public TaskAttemptStateInternal transition(TaskAttemptImpl attempt,
+ public TaskAttemptStateInternal transition(TaskAttemptImpl sourceAttempt,
TaskAttemptEvent event) {
TaskAttemptEventOutputFailed outputFailedEvent =
(TaskAttemptEventOutputFailed) event;
- TezEvent tezEvent = outputFailedEvent.getInputFailedEvent();
- TezTaskAttemptID failedDestTaId =
tezEvent.getSourceInfo().getTaskAttemptID();
- InputReadErrorEvent readErrorEvent =
(InputReadErrorEvent)tezEvent.getEvent();
+ TezEvent inputFailedEvent = outputFailedEvent.getInputFailedEvent();
+ TezTaskAttemptID failedDestTaId =
inputFailedEvent.getSourceInfo().getTaskAttemptID();
+
+ InputReadErrorEvent readErrorEvent =
(InputReadErrorEvent)inputFailedEvent.getEvent();
int failedInputIndexOnDestTa = readErrorEvent.getIndex();
- if (readErrorEvent.getVersion() != attempt.getID().getId()) {
- throw new TezUncheckedException(attempt.getID()
+
+ if (readErrorEvent.getVersion() != sourceAttempt.getID().getId()) {
+ throw new TezUncheckedException(sourceAttempt.getID()
+ " incorrectly blamed for read error from " + failedDestTaId
+ " at inputIndex " + failedInputIndexOnDestTa + " version"
+ readErrorEvent.getVersion());
}
- LOG.info(attempt.getID()
- + " blamed for read error from " + failedDestTaId
- + " at inputIndex " + failedInputIndexOnDestTa);
- long time = attempt.clock.getTime();
- Long firstErrReportTime =
attempt.uniquefailedOutputReports.get(failedDestTaId);
+ // source host: where the data input is supposed to come from
+ String sHost = sourceAttempt.getNodeId().getHost();
+ // destination: where the data is tried to be fetched to
+ String dHost = readErrorEvent.getDestinationLocalhostName();
+
+ LOG.info("{} (on {}) blamed for read error from {} (on {}) at inputIndex
{}", sourceAttempt.getID(),
+ sHost, failedDestTaId, dHost, failedInputIndexOnDestTa);
+
+ boolean tooManyDownstreamHostsBlamedTheSameUpstreamHost = false;
+ Map<String, Set<String>> downstreamBlamingHosts =
sourceAttempt.getVertex().getDownstreamBlamingHosts();
Review comment:
Thought more about this again. Since this map would be populated mainly
during error condition, there needs to be a lot of bad nodes to cause such
case.
Should be ok to have this map. But the other concern is how to choose the
right default config? 1 seems very restrictive, as source will bail out
immediately on second downstream node reporting failure. Set it to a much
higher value and on need basis this can be adjusted.
Can you check if this value can be adjusted at runtime? If so, this may need
to be added in "confKeys" of respective inputs/outputs? E.g plz refer to
UnorderedKVInput
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