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Posted to hdfs-issues@hadoop.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2022/12/20 05:22:00 UTC
[jira] [Updated] (HDFS-16872) Fix log throttling by declaring LogThrottlingHelper as static members
[ https://issues.apache.org/jira/browse/HDFS-16872?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
ASF GitHub Bot updated HDFS-16872:
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Labels: pull-request-available (was: )
> Fix log throttling by declaring LogThrottlingHelper as static members
> ---------------------------------------------------------------------
>
> Key: HDFS-16872
> URL: https://issues.apache.org/jira/browse/HDFS-16872
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 3.3.4
> Reporter: Chengbing Liu
> Priority: Major
> Labels: pull-request-available
>
> In our production cluster with Observer NameNode enabled, we have plenty of logs printed by {{FSEditLogLoader}} and {{RedundantEditLogInputStream}}. The {{LogThrottlingHelper}} doesn't seem to work.
> {noformat}
> 2022-10-25 09:26:50,380 INFO org.apache.hadoop.hdfs.server.namenode.FSImage: Start loading edits file ByteStringEditLog[17686250688, 17686250688], ByteStringEditLog[17686250688, 17686250688], ByteStringEditLog[17686250688, 17686250688] maxTxnsToRead = 9223372036854775807
> 2022-10-25 09:26:50,380 INFO org.apache.hadoop.hdfs.server.namenode.RedundantEditLogInputStream: Fast-forwarding stream 'ByteStringEditLog[17686250688, 17686250688], ByteStringEditLog[17686250688, 17686250688], ByteStringEditLog[17686250688, 17686250688]' to transaction ID 17686250688
> 2022-10-25 09:26:50,380 INFO org.apache.hadoop.hdfs.server.namenode.RedundantEditLogInputStream: Fast-forwarding stream 'ByteStringEditLog[17686250688, 17686250688]' to transaction ID 17686250688
> 2022-10-25 09:26:50,380 INFO org.apache.hadoop.hdfs.server.namenode.FSImage: Loaded 1 edits file(s) (the last named ByteStringEditLog[17686250688, 17686250688], ByteStringEditLog[17686250688, 17686250688], ByteStringEditLog[17686250688, 17686250688]) of total size 527.0, total edits 1.0, total load time 0.0 ms
> 2022-10-25 09:26:50,387 INFO org.apache.hadoop.hdfs.server.namenode.FSImage: Start loading edits file ByteStringEditLog[17686250689, 17686250693], ByteStringEditLog[17686250689, 17686250693], ByteStringEditLog[17686250689, 17686250693] maxTxnsToRead = 9223372036854775807
> 2022-10-25 09:26:50,387 INFO org.apache.hadoop.hdfs.server.namenode.RedundantEditLogInputStream: Fast-forwarding stream 'ByteStringEditLog[17686250689, 17686250693], ByteStringEditLog[17686250689, 17686250693], ByteStringEditLog[17686250689, 17686250693]' to transaction ID 17686250689
> 2022-10-25 09:26:50,387 INFO org.apache.hadoop.hdfs.server.namenode.RedundantEditLogInputStream: Fast-forwarding stream 'ByteStringEditLog[17686250689, 17686250693]' to transaction ID 17686250689
> 2022-10-25 09:26:50,387 INFO org.apache.hadoop.hdfs.server.namenode.FSImage: Loaded 1 edits file(s) (the last named ByteStringEditLog[17686250689, 17686250693], ByteStringEditLog[17686250689, 17686250693], ByteStringEditLog[17686250689, 17686250693]) of total size 890.0, total edits 5.0, total load time 1.0 ms
> {noformat}
> After some digging, I found the cause is that {{LogThrottlingHelper}}'s are declared as instance variables of all the enclosing classes, including {{FSImage}}, {{FSEditLogLoader}} and {{RedundantEditLogInputStream}}. Therefore the logging frequency will not be limited across different instances. For classes with only limited number of instances, such as {{FSImage}}, this is fine. For others whose instances are created frequently, such as {{FSEditLogLoader}} and {{RedundantEditLogInputStream}}, it will result in plenty of logs.
> This can be fixed by declaring {{LogThrottlingHelper}}'s as static members.
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