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https://issues.apache.org/jira/browse/HDFS-17105?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiaoqiao He resolved HDFS-17105.
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Fix Version/s: 3.4.0
Hadoop Flags: Reviewed
Assignee: ConfX
Resolution: Fixed
> mistakenly purge editLogs even after it is empty in NNStorageRetentionManager
> ------------------------------------------------------------------------------
>
> Key: HDFS-17105
> URL: https://issues.apache.org/jira/browse/HDFS-17105
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: ConfX
> Assignee: ConfX
> Priority: Critical
> Labels: pull-request-available
> Fix For: 3.4.0
>
> Attachments: reproduce.sh
>
>
> h2. What happened:
> Got {{IndexOutOfBoundsException}} after setting
> {{dfs.namenode.max.extra.edits.segments.retained}} to a negative value and
> purging old record with {{{}NNStorageRetentionManager{}}}.
> h2. Where's the bug:
> In line 156 of {{{}NNStorageRetentionManager{}}}, the manager trims
> {{editLogs}} until it is under the {{{}maxExtraEditsSegmentsToRetain{}}}:
> {noformat}
> while (editLogs.size() > maxExtraEditsSegmentsToRetain) {
> purgeLogsFrom = editLogs.get(0).getLastTxId() + 1;
> editLogs.remove(0);
> }{noformat}
> However, if {{dfs.namenode.max.extra.edits.segments.retained}} is set to
> below 0 the size of {{editLogs}} would never be below, resulting in
> ultimately {{editLog.size()=0}} and thus {{editLogs.get(0)}} is out of range.
> h2. How to reproduce:
> (1) Set {{dfs.namenode.max.extra.edits.segments.retained}} to -1974676133
> (2) Run test:
> {{org.apache.hadoop.hdfs.server.namenode.TestNNStorageRetentionManager#testNoLogs}}
> h2. Stacktrace:
> {noformat}
> java.lang.IndexOutOfBoundsException: Index 0 out of bounds for length 0
> at
> java.base/jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:64)
> at
> java.base/jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Preconditions.java:70)
> at
> java.base/jdk.internal.util.Preconditions.checkIndex(Preconditions.java:248)
> at java.base/java.util.Objects.checkIndex(Objects.java:372)
> at java.base/java.util.ArrayList.get(ArrayList.java:459)
> at
> org.apache.hadoop.hdfs.server.namenode.NNStorageRetentionManager.purgeOldStorage(NNStorageRetentionManager.java:157)
> at
> org.apache.hadoop.hdfs.server.namenode.TestNNStorageRetentionManager.runTest(TestNNStorageRetentionManager.java:299)
> at
> org.apache.hadoop.hdfs.server.namenode.TestNNStorageRetentionManager.testNoLogs(TestNNStorageRetentionManager.java:143){noformat}
> For an easy reproduction, run the reproduce.sh in the attachment.
> We are happy to provide a patch if this issue is confirmed.
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