[YARN-2724] If an unreadable file is encountered during log aggregation then aggregated file in HDFS badly formed

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.5.1
• Fix Version/s: 2.6.0
• Component/s: log-aggregation
• Hadoop Flags: Reviewed
• Assignee: Xuan Gong
• Reporter: Sumit Mohanty
• Created: 22/Oct/14 00:55
• Updated: 01/Dec/14 03:10
• Resolved: 24/Oct/14 18:18

Description

Look into the log output snippet. It looks like there is an issue during aggregation when an unreadable file is encountered. Likely, this results in bad encoding.

LogType: command-13.json
LogLength: 13934
Log Contents:
Error aggregating log file. Log file : /grid/0/yarn/log/application_1413865041660_0002/container_1413865041660_0002_01_000004/command-13.json/grid/0/yarn/log/application_1413865041660_0002/container_1413865041660_0002_01_000004/command-13.json (Permission denied)command-3.json13983Error aggregating log file. Log file : /grid/0/yarn/log/application_1413865041660_0002/container_1413865041660_0002_01_000004/command-3.json/grid/0/yarn/log/application_1413865041660_0002/contaierrors-13.txt0660_0002_01_000004/command-3.json (Permission denied)
              errors-3.txt0gc.log-20141021044514484052014-10-21T04:45:12.046+0000: 5.134: [GC2014-10-21T04:45:12.046+0000: 5.134: [ParNew: 163840K->15575K(184320K), 0.0488700 secs] 163840K->15575K(1028096K), 0.0492510 secs] [Times: user=0.06 sys=0.01, real=0.05 secs]
2014-10-21T04:45:14.939+0000: 8.027: [GC2014-10-21T04:45:14.939+0000: 8.027: [ParNew: 179415K->11865K(184320K), 0.0941310 secs] 179415K->17228K(1028096K), 0.0943140 secs] [Times: user=0.13 sys=0.04, real=0.09 secs]
2014-10-21T04:46:42.099+0000: 95.187: [GC2014-10-21T04:46:42.099+0000: 95.187: [ParNew: 175705K->12802K(184320K), 0.0466420 secs] 181068K->18164K(1028096K), 0.0468490 secs] [Times: user=0.06 sys=0.00, real=0.04 secs]

Specifically, look at the text after the exception text. There should be two more entries for log files but none exist. This is likely due to the fact that command-13.json is expected to be of length 13934 but its is not as the file was never read.

I think, it should have been

LogType: command-13.json
LogLength: <Length of the exception text>
Log Contents:
Error aggregating log file. Log file : /grid/0/yarn/log/application_1413865041660_0002/container_1413865041660_0002_01_000004/command-13.json/grid/0/yarn/log/application_1413865041660_0002/container_1413865041660_0002_01_000004/command-13.json (Permission denied)command-3.json13983Error aggregating log file. Log file : /grid/0/yarn/log/application_1413865041660_0002/container_1413865041660_0002_01_000004/command-3.json/grid/0/yarn/log/application_1413865041660_0002/contaierrors-13.txt0660_0002_01_000004/command-3.json (Permission denied)

LogType: errors-3.txt
LogLength:0
Log Contents:

LogType:gc.log
LogLength:???
Log Contents:
......-20141021044514484052014-10-21T04:45:12.046+0000: 5.134: [GC2014-10-21T04:45:12.046+0000: 5.134: [ParNew: 163840K- .......

Issue Links

• is depended upon by: YARN-2734 If a sub-folder is encountered by log aggregator it results in invalid aggregated file
• is related to: YARN-2733 Aggregated log file may be corrupted if IOException happens at copying
• relates to: YARN-2734 If a sub-folder is encountered by log aggregator it results in invalid aggregated file
• relates to: YARN-2747 TestAggregatedLogFormat fails in trunk