static void writeToIndexFile(
String logLocation,
TaskAttemptID currentTaskid,
boolean isCleanup,
Map<LogName, Long[]> lengths)
throws IOException {
// To ensure atomicity of updates to index file, write to temporary
// index
// file first and then rename.
File tmpIndexFile = getTmpIndexFile(currentTaskid, isCleanup);
BufferedOutputStream bos =
new BufferedOutputStream(SecureIOUtils.createForWrite(tmpIndexFile, 0644));
DataOutputStream dos = new DataOutputStream(bos);
// the format of the index file is
// LOG_DIR: <the dir where the task logs are really stored>
// STDOUT: <start-offset in the stdout file> <length>
// STDERR: <start-offset in the stderr file> <length>
// SYSLOG: <start-offset in the syslog file> <length>
dos.writeBytes(LogFileDetail.LOCATION + logLocation + "\n");
for (LogName logName : LOGS_TRACKED_BY_INDEX_FILES) {
Long[] lens = lengths.get(logName);
dos.writeBytes(
logName.toString()
+ ":"
+ lens[0].toString()
+ " "
+ Long.toString(lens[1].longValue() - lens[0].longValue())
+ "\n");
}
dos.close();
File indexFile = getIndexFile(currentTaskid, isCleanup);
Path indexFilePath = new Path(indexFile.getAbsolutePath());
Path tmpIndexFilePath = new Path(tmpIndexFile.getAbsolutePath());
if (localFS == null) { // set localFS once
localFS = FileSystem.getLocal(new Configuration());
}
localFS.rename(tmpIndexFilePath, indexFilePath);
}
