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https://issues.apache.org/jira/browse/FLINK-19300?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17199331#comment-17199331
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Congxian Qiu(klion26) commented on FLINK-19300:
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[~xianggao] thanks for reporting the issue, I think you analysis is right,
{{InputStream#read}} can't guarantee to fully read the byte array.
As this may loss the timer I'm not sure this need to be a blocker or not?
> Timer loss after restoring from savepoint
> -----------------------------------------
>
> Key: FLINK-19300
> URL: https://issues.apache.org/jira/browse/FLINK-19300
> Project: Flink
> Issue Type: Bug
> Components: Runtime / State Backends
> Reporter: Xiang Gao
> Priority: Critical
>
> While using heap-based timers, we are seeing occasional timer loss after
> restoring program from savepoint, especially when using a remote savepoint
> storage (s3).
> After some investigation, the issue seems to be related to [this line in
> deserialization|https://github.com/apache/flink/blob/master/flink-core/src/main/java/org/apache/flink/core/io/PostVersionedIOReadableWritable.java#L65].
> When trying to check the VERSIONED_IDENTIFIER, the input stream may not
> guarantee filling the byte array, causing timers to be dropped for the
> affected key group.
> Should keep reading until expected number of bytes are actually read or if
> end of the stream has been reached.
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