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[ML] Fix possible race condition starting datafeed #51646

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Jan 30, 2020
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[ML] Fix possible race condition starting datafeed #51646

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[ML] Fix possible race condition starting datafeed
henningandersen Jan 29, 2020
b8978dd
Fix message according to review.
henningandersen Jan 29, 2020
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7 changes: 6 additions & 1 deletion x-pack/plugin/ml/src/main/java/org/elasticsearch/xpack/ml/datafeed/DatafeedManager.java
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Original file line number Diff line number Diff line change
Expand Up @@ -520,7 +520,12 @@ private void runTask(TransportStartDatafeedAction.DatafeedTask task) {
// a context with sufficient permissions would coincidentally be in force in some single node
// tests, leading to bugs not caught in CI due to many tests running in single node test clusters.
try (ThreadContext.StoredContext ignore = threadPool.getThreadContext().stashContext()) {
innerRun(runningDatafeedsOnThisNode.get(task.getAllocationId()), task.getDatafeedStartTime(), task.getEndTime());
Holder holder = runningDatafeedsOnThisNode.get(task.getAllocationId());
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@henningandersen henningandersen Jan 29, 2020 •
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Putting in a sleep(100) before this line provokes the NPE.

if (holder != null) {
innerRun(holder, task.getDatafeedStartTime(), task.getEndTime());
} else {
logger.warn("Datafeed [{}] was closed while being opened", task.getDatafeedId());
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We use the terms “started” and “stopped” with datafeeds instead of “opened” and “closed”, so please could you change those two words in this message.

}
}
}

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