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Make peer recovery send file chunks async #44468

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merged 2 commits into from
Jul 17, 2019
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@dnhatn dnhatn commented Jul 17, 2019

This PR reintroduces #44040 with an additional commit fixing the notify once assertion. We can call MultiFileTransfer#onComplete twice if the recovery is canceled during the clean_files step.

  1. Send_files step calls MultiFileTransfer#onComplete(null) to start the clean_files step

  2. Clean_files sends and receives a response before the method returns. The response notifies the phase 1 listener (either success or failure).

  3. Before returning, the clean_files method checkForCancel and throws an exception as the recovery was canceled. This causes the send_files listener to notify the phase1 listener. However, the phase1 listener was notified in step 2 already. The phase1 listener must be notified at most once as it delegates to ListenerFuture.

The new commit allows StepListener to be notified multiple times.

Relates #44040
Relates #36195

@dnhatn dnhatn added >enhancement :Distributed Indexing/Recovery Anything around constructing a new shard, either from a local or a remote source. v8.0.0 v7.4.0 labels Jul 17, 2019
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Pinging @elastic/es-distributed

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dnhatn commented Jul 17, 2019

@ywelsch @original-brownbear Please review the additional commit: 738ab4e.

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LGTM

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dnhatn commented Jul 17, 2019

Thanks Yannick.

@dnhatn dnhatn merged commit 34f65c6 into elastic:master Jul 17, 2019
@dnhatn dnhatn deleted the send-chunks branch July 17, 2019 12:17
dnhatn added a commit that referenced this pull request Jul 18, 2019
dnhatn added a commit that referenced this pull request Oct 22, 2019
dnhatn added a commit that referenced this pull request Oct 22, 2019
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:Distributed Indexing/Recovery Anything around constructing a new shard, either from a local or a remote source. >enhancement v7.4.0 v8.0.0-alpha1
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