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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8920) Erasure Coding: when recovering lost blocks, logs can be too verbose and hurt performance
Date Wed, 30 Sep 2015 19:38:55 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8920?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14938627#comment-14938627
] 

Hudson commented on HDFS-8920:
------------------------------

FAILURE: Integrated in Hadoop-Mapreduce-trunk-Java8 #465 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk-Java8/465/])
HDFS-8920. Erasure Coding: when recovering lost blocks, logs can be too (zhezhang: rev 7bff8ca1c872ea534a96cbbc5f70134574e289ce)
* hadoop-hdfs-project/hadoop-hdfs/CHANGES-HDFS-EC-7285.txt
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSStripedInputStream.java
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSInputStream.java


> Erasure Coding: when recovering lost blocks, logs can be too verbose and hurt performance
> -----------------------------------------------------------------------------------------
>
>                 Key: HDFS-8920
>                 URL: https://issues.apache.org/jira/browse/HDFS-8920
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Rui Li
>            Assignee: Rui Li
>             Fix For: HDFS-7285
>
>         Attachments: HDFS-8920-HDFS-7285.1.patch, HDFS-8920-HDFS-7285.2.patch
>
>
> When we test reading data with datanodes killed, {{DFSInputStream::getBestNodeDNAddrPair}}
becomes a hot spot method and effectively blocks the client JVM. This log seems too verbose:
> {code}
>     if (chosenNode == null) {
>       DFSClient.LOG.warn("No live nodes contain block " + block.getBlock() +
>           " after checking nodes = " + Arrays.toString(nodes) +
>           ", ignoredNodes = " + ignoredNodes);
>       return null;
>     }
> {code}



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