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https://issues.apache.org/jira/browse/HDFS-16869?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17648876#comment-17648876
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ASF GitHub Bot commented on HDFS-16869:
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Daniel-009497 opened a new pull request, #5235:
URL: https://github.com/apache/hadoop/pull/5235
We first encouter this issue in Hadoop 3.3.1 version when we are
rollingUpgrade from 3.1.1 to 3.3.1, which may cause NameNode start failure but
just occasionally not everytime.
The root cause for why 0 size of clientId happened here is still under
investigating.
So here we add a protection judge to exclude 0 size of clientId from being
added into cache.
> Fail to start namenode owing to 0 size of clientid recorded in edit log.
> ------------------------------------------------------------------------
>
> Key: HDFS-16869
> URL: https://issues.apache.org/jira/browse/HDFS-16869
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 3.3.1, 3.3.2, 3.3.3, 3.3.4
> Reporter: Daniel Ma
> Assignee: Daniel Ma
> Priority: Major
>
> We first encounter this issue in 3.3.1 version when we are upgrading from
> 3.1.1 to 3.3.1 which may cause NameNode start failure but just occasionally
> not everytime.
> The root cause for why 0 size of clientid happened here is still not found
> after long-term investigating.
> So here we add a protection judge here to exlude 0 size of clientid from be
> added into cache.
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