katty he created HDFS-17268:
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Summary: when SocketTimeoutException happen, overwrite mode can
delete old data, and make file empty
Key: HDFS-17268
URL: https://issues.apache.org/jira/browse/HDFS-17268
Project: Hadoop HDFS
Issue Type: Bug
Reporter: katty he
recently, i use fs.create(path, true/* createOrOverwrite */) to write data into
parquet file a, but when SocketTimeoutException happend, such as "
org.apache.hadoop.io.retry.RetryInvocationHandler [] -
java.net.SocketTimeoutException: Call From xxx to namenodexxx:8888 failed on
socket timeout exception: java.net.SocketTimeoutException: 60000 millis timeout
while waiting for channel to be ready for read. ch :
java.nio.channels.SocketChannel[connected local=/node:33416
remote=namenode:8888]; For more details see:
http://wiki.apache.org/hadoop/SocketTimeout, while invoking
ClientNamenodeProtocolTranslatorPB.create over namenode:8888. Trying to
failover immediately." then i found the size of file a is zero, and read with
error "file a is not a parquet file", and there were two create calls from two
different routers in hdfs audit log, so i think overwrite is not safe in some
situation
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