[ https://issues.apache.org/jira/browse/HADOOP-15928?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Work on HADOOP-15928 started by Pranay Singh. --------------------------------------------- > Excessive error logging when using HDFS in S3 environment > --------------------------------------------------------- > > Key: HADOOP-15928 > URL: https://issues.apache.org/jira/browse/HADOOP-15928 > Project: Hadoop Common > Issue Type: Improvement > Reporter: Pranay Singh > Assignee: Pranay Singh > Priority: Major > Attachments: HADOOP-15928.001.patch > > > Problem: > ------------ > There is excessive error logging when Impala uses HDFS in S3 environment, > this issue is caused because of defect HADOOP-14603 "S3A input stream to > support ByteBufferReadable" > Excessive error logging results in defect IMPALA-5256: "ERROR log files can > get very large". This causes the error log files to be huge. > The following message is printed repeatedly in the error log: > UnsupportedOperationException: Byte-buffer read unsupported by input > streamjava.lang.UnsupportedOperationException: Byte-buffer read unsupported > by input stream > at > org.apache.hadoop.fs.FSDataInputStream.read(FSDataInputStream.java:150) > Root cause > ---------------- > After investigating the issue, it appears that the above exception is printed > because > when a file is opened via hdfsOpenFileImpl() calls readDirect() which is > hitting this > exception. > Fix: > ---- > Since the hdfs client is not initiating the byte buffered read but is > happening in a implicit manner, we should not be generating the error log > during open of a file. -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: common-issues-h...@hadoop.apache.org