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https://issues.apache.org/jira/browse/HBASE-27093?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Duo Zhang resolved HBASE-27093.
-------------------------------
Fix Version/s: 2.5.0
3.0.0-alpha-3
2.4.13
Hadoop Flags: Reviewed
Resolution: Fixed
Pushed to branch-2.4+.
Thanks [~xiaowangzhixiao] for contributing!
> AsyncNonMetaRegionLocator：put Complete CompletableFuture outside lock block
> ---------------------------------------------------------------------------
>
> Key: HBASE-27093
> URL: https://issues.apache.org/jira/browse/HBASE-27093
> Project: HBase
> Issue Type: Improvement
> Components: asyncclient, Client
> Affects Versions: 3.0.0-alpha-2, 2.4.12
> Environment: 2.4.12
> Reporter: zhiwang
> Assignee: zhiwang
> Priority: Major
> Labels: deadlock
> Fix For: 2.5.0, 3.0.0-alpha-3, 2.4.13
>
> Original Estimate: 24h
> Remaining Estimate: 24h
>
>
> {code:java}
> synchronized (tableCache) {
> tableCache.pendingRequests.remove(req);
> // fail the request itself, no matter whether it is a
> DoNotRetryIOException, as we have
> // already retried several times
> CompletableFuture<?> future = tableCache.allRequests.remove(req);
> if (future != null) {
> future.completeExceptionally(error);
> }
> tableCache.clearCompletedRequests(null);
> // Remove a complete locate request in a synchronized block, so the table
> cache must have
> // quota to send a candidate request.
> toSend = tableCache.getCandidate();
> toSend.ifPresent(r -> tableCache.send(r));
> }
> {code}
> Complete or completeExceptionally in a lock block may cause deadlock. We can
> put this action outside the lock block to avoid deadlock.
>
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