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Rui Li commented on HDFS-8920: ------------------------------ I tried several failures locally and cannot reproduce them. Also both {{TestDFSInputStream}} and {{TestDFSStripedInputStream}} pass on my side. So I suppose the failures here are not related. Since the patch only changes how we print logs, I didn't add new tests for it. I did manually perform some tests on a cluster, as I mentioned above. > 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 > Attachments: HDFS-8920-HDFS-7285.1.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} -- This message was sent by Atlassian JIRA (v6.3.4#6332)