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Posted to hdfs-dev@hadoop.apache.org by "Rui Li (JIRA)" <ji...@apache.org> on 2015/08/19 03:55:46 UTC
[jira] [Created] (HDFS-8920) Erasure Coding: when recovering lost
blocks, logs can be too verbose and hurt performance
Rui Li created HDFS-8920:
----------------------------
Summary: 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
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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