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Posted to issues@ozone.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2026/08/21 17:21:00 UTC
[jira] [Updated] (HDDS-16241) gRPC deadline kills long-lived block streams after 30 seconds and the client never recovers
[ https://issues.apache.org/jira/browse/HDDS-16241?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
ASF GitHub Bot updated HDDS-16241:
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Labels: pull-request-available (was: )
> gRPC deadline kills long-lived block streams after 30 seconds and the client never recovers
> -------------------------------------------------------------------------------------------
>
> Key: HDDS-16241
> URL: https://issues.apache.org/jira/browse/HDDS-16241
> Project: Apache Ozone
> Issue Type: Bug
> Components: Ozone Client
> Affects Versions: 2.3.0
> Reporter: Sergey Soldatov
> Assignee: Sergey Soldatov
> Priority: Major
> Labels: pull-request-available
>
> XceiverClientGrpc.initStreamRead sets a gRPC deadline of ozone.client.read.timeout (30 seconds) on the streaming ReadBlock call. A gRPC deadline bounds the whole call, and since HDDS-13974 one stream stays open per block for the lifetime of the input stream, so every stream is cancelled with DEADLINE_EXCEEDED 30 seconds after it opens, even when healthy. The client then never recovers: the failed reader is never rebuilt, so every later read of that block replays the same stale error for as long as the file stays open; a failure arriving while the reader waits for a response is mistaken for a normal end of stream and shows up as a wrong early EOF; and the wrapped exception chain is not seen as retryable, so the client never fails over to another datanode. Applications that keep files open for a long time, such as HBase RegionServers, are hit hardest: in an HBase on Ozone YCSB test about 42 percent of all reads failed this way.
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