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https://issues.apache.org/jira/browse/HDFS-11592?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Akira Ajisaka updated HDFS-11592:
---------------------------------
Fix Version/s: 2.9.0
> Closing a file has a wasteful preconditions in NameNode
> -------------------------------------------------------
>
> Key: HDFS-11592
> URL: https://issues.apache.org/jira/browse/HDFS-11592
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Reporter: Eric Badger
> Assignee: Eric Badger
> Fix For: 2.9.0, 3.0.0-alpha4, 2.8.1
>
> Attachments: HDFS-11592.001.patch
>
>
> When a file is closed, the NN checks if all the blocks are complete. Instead
> of a simple 'if (!complete) throw new IllegalState(expensive-err-string)" it
> invokes "Preconditions.checkStatus(complete, expensive-err-string)". The
> check is done in a loop for all blocks, so more blocks = more penalty. The
> expensive string should only be computed when an error actually occurs. A
> telltale sign is seeing this in a stacktrace:
> {noformat}
> at java.lang.Class.getEnclosingMethod0(Native Method)
> at java.lang.Class.getEnclosingMethodInfo(Class.java:1072)
> at java.lang.Class.getEnclosingClass(Class.java:1272)
> at java.lang.Class.getSimpleBinaryName(Class.java:1443)
> at java.lang.Class.getSimpleName(Class.java:1309)
> at
> org.apache.hadoop.hdfs.server.namenode.INodeFile.assertAllBlocksComplete(INodeFile.java:246)
> {noformat}
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