Eric Vandenberg created SPARK-21571:
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Summary: Spark history server leaves incomplete or unreadable
history files around forever.
Key: SPARK-21571
URL: https://issues.apache.org/jira/browse/SPARK-21571
Project: Spark
Issue Type: Bug
Components: Scheduler
Affects Versions: 2.2.0
Reporter: Eric Vandenberg
Priority: Minor
We have noticed that history server logs are sometimes never cleaned up. The
current history server logic *ONLY* cleans up history files if they are
completed since in general it doesn't make sense to clean up inprogress history
files (after all, the job is presumably still running?) Note that inprogress
history files would generally not be targeted for clean up any way assuming
they regularly flush logs and the file system accurately updates the history
log last modified time/size, while this is likely it is not guaranteed behavior.
As a consequence of the current clean up logic and a combination of unclean
shutdowns, various file system bugs, earlier spark bugs, etc. we have
accumulated thousands of these dead history files associated with long since
gone jobs.
For example (with spark.history.fs.cleaner.maxAge=14d):
-rw-rw---- 3 xxxxxx ooooooo
14382 2016-09-13 15:40
/user/hadoop/xxxxxxxxxxxxxx/spark/logs/qqqqqq1974_ppppppppppp-8812_110586000000195_dev4384_jjjjjjjjjjjj-53982.zstandard
-rw-rw---- 3 xxxx ooooooo
5933 2016-11-01 20:16
/user/hadoop/xxxxxxxxxxxxxx/spark/logs/qqqqqq2016_ppppppppppp-8812_126507000000673_dev5365_jjjjjjjjjjjj-65313.lz4
-rw-rw---- 3 yyy ooooooo
0 2017-01-19 11:59
/user/hadoop/xxxxxxxxxxxxxx/spark/logs/yyyyyyyyyyyyyyyy0057_zzzz326_mmmmmmmmm-57863.lz4.inprogress
-rw-rw---- 3 xxxxxxxxx ooooooo
0 2017-01-19 14:17
/user/hadoop/xxxxxxxxxxxxxx/spark/logs/yyyyyyyyyyyyyyyy0063_zzzz688_mmmmmmmmm-33246.lz4.inprogress
-rw-rw---- 3 yyy ooooooo
0 2017-01-20 10:56
/user/hadoop/xxxxxxxxxxxxxx/spark/logs/yyyyyyyyyyyyyyyy1030_zzzz326_mmmmmmmmm-45195.lz4.inprogress
-rw-rw---- 3 xxxxxxxxxxxx ooooooo
11955 2017-01-20 17:55
/user/hadoop/xxxxxxxxxxxxxx/spark/logs/yyyyyyyyyyyyyyyy1314_wwww54_kkkkkkkkkkkkkk-64671.lz4.inprogress
-rw-rw---- 3 xxxxxxxxxxxx ooooooo
11958 2017-01-20 17:55
/user/hadoop/xxxxxxxxxxxxxx/spark/logs/yyyyyyyyyyyyyyyy1315_wwww1667_kkkkkkkkkkkkkk-58968.lz4.inprogress
-rw-rw---- 3 xxxxxxxxxxxx ooooooo
11960 2017-01-20 17:55
/user/hadoop/xxxxxxxxxxxxxx/spark/logs/yyyyyyyyyyyyyyyy1316_wwww54_kkkkkkkkkkkkkk-48058.lz4.inprogress
Based on the current logic, clean up candidates are skipped in several cases:
1. if a file has 0 bytes, it is completely ignored
2. if a file is in progress, is it completely ignored
3. if a file is complete and but not parseable, or can't extract appID, it is
completely ignored.
To address this edge case and provide a way to clean out orphaned history files
I propose a new configuration option:
spark.history.fs.cleaner.aggressive={true, false}, default is false.
If true, the history server will more aggressively garbage collect history
files in cases (1), (2) and (3). Since the default is false, existing
customers won't be affected unless they explicitly opt-in. If customers have
similar leaking garbage over time they have the option of aggressively cleaning
up in such cases. Also note that aggressive clean up may not be appropriate
for some customers if they have long running jobs that exceed the
cleaner.maxAge time frame and/or have buggy file systems.
Would like to get feedback on if this seems like a reasonable solution.
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