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https://reviews.apache.org/r/32183/
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Review request for Ambari, Alejandro Fernandez, Dmytro Sen, Mahadev Konar, and
Myroslav Papirkovskyy.
Bugs: AMBARI-10111
https://issues.apache.org/jira/browse/AMBARI-10111
Repository: ambari
Description
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After looking at HBase logs and GC logs, discovered that:
1. RS stopped due to unreachable ZK, the cause based on logs is long gc pause:
{code}
2015-03-17 15:34:33,810 WARN [M:0;perf-400-10mar-b-ams-1:48488.oldLogCleaner]
util.Sleeper: We slept 78463ms instead of 60000ms, this is likely due to a long
garbage collecting pause and it's usually bad, see
http://hbase.apache.org/book.html#trouble.rs.runtime.zkexpired
2015-03-17 15:34:33,810 WARN
[RS:0;perf-400-10mar-b-ams-1:38900.compactionChecker] util.Sleeper: We slept
26609ms instead of 10000ms, this is likely due to a long garbage collecting
pause and it's usually bad, see
http://hbase.apache.org/book.html#trouble.rs.runtime.zkexpired
2015-03-17 15:34:33,810 WARN
[RS:0;perf-400-10mar-b-ams-1:38900.periodicFlusher] util.Sleeper: We slept
26608ms instead of 10000ms, this is likely due to a long garbage collecting
pause and it's usually bad, see
http://hbase.apache.org/book.html#trouble.rs.runtime.zkexpired
{code}
2. Looking at gc logs, it seems everything is nice and clean and a sudden
unexpected event as seen here:
{code}
2015-03-17T15:34:10.908+0000: 47483.945: [GC2015-03-17T15:34:10.908+0000:
47483.945: [ParNew: 613440K->68096K(613440K), 0.0645970 secs]
10961428K->10444812K(12514816K), 0.0648180 secs] [Times: user=0.34 sys=0.01,
real=0.06 secs]
2015-03-17T15:34:11.525+0000: 47484.562: [GC2015-03-17T15:34:11.525+0000:
47484.562: [ParNew: 613424K->68096K(613440K), 0.0585420 secs]
10956776K->10438129K(12514816K), 0.0590000 secs] [Times: user=0.31 sys=0.02,
real=0.06 secs]
2015-03-17T15:34:12.133+0000: 47485.170: [GC2015-03-17T15:34:12.134+0000:
47485.170: [ParNew (promotion failed): 613346K->613346K(613440K), 0.1492450
secs]2015-03-17T15:34:12.283+0000: 47485.320: [CMS2015-03-17T15:34:28.879+0000:
47501.916: [CMS-concurrent-sweep: 33.271/35.389 secs] [Times: user=144.69
sys=3.76, real=35.39 secs]
(concurrent mode failure): 10365250K->4753155K(11901376K), 21.5240950 secs]
10955450K->4753155K(12514816K), [CMS Perm : 41519K->41519K(69388K)], 21.6736450
secs] [Times: user=21.93 sys=0.02, real=21.67 secs]
2015-03-17T15:34:34.584+0000: 47507.621: [GC2015-03-17T15:34:34.584+0000:
47507.621: [ParNew: 545344K->59138K(613440K), 0.0552630 secs]
5298499K->4812293K(12514816K), 0.0554990 secs] [Times: user=0.32 sys=0.02,
real=0.06 secs]
{code}
The possible reason is GCE VM paused for more that a minute leading to the
unexpected event.
*Recommendations*:
- Tune GC settings for the HBase daemon.
- Create a Canary script to check health of the system and restart the
underlying daemons if needed. Creating a Jira for 2.1.
Diffs
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ambari-server/src/main/resources/common-services/AMBARI_METRICS/0.1.0/configuration/ams-hbase-env.xml
88692a4
ambari-server/src/main/resources/common-services/AMBARI_METRICS/0.1.0/package/scripts/hbase.py
8c8f85a
ambari-server/src/main/resources/common-services/AMBARI_METRICS/0.1.0/package/scripts/params.py
ab8b56a
ambari-server/src/main/resources/stacks/HDP/2.0.6/services/stack_advisor.py
a933d98
ambari-server/src/test/python/stacks/2.2/common/test_stack_advisor.py 33bac19
Diff: https://reviews.apache.org/r/32183/diff/
Testing
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Manually verified. Unit tests pass.
Thanks,
Sid Wagle
