Igor Kamyshnikov created IGNITE-11974:
-----------------------------------------
Summary: infinite loop and 100% cpu in GridDhtPartitionsEvictor:
Eviction in progress ...
Key: IGNITE-11974
URL: https://issues.apache.org/jira/browse/IGNITE-11974
Project: Ignite
Issue Type: Bug
Components: cache
Affects Versions: 2.5
Reporter: Igor Kamyshnikov
Attachments: image-2019-07-10-16-07-37-185.png
Note: RCA was not done:
Sometimes ignite server nodes fall into infinite loop and consume 100% cpu:
{noformat}
"sys-#260008" #260285 prio=5 os_prio=0 tid=0x00007fabb020a800 nid=0x1e850
runnable [0x00007fab26fef000]
java.lang.Thread.State: RUNNABLE
at
java.util.concurrent.ConcurrentHashMap$Traverser.advance(ConcurrentHashMap.java:3339)
at
java.util.concurrent.ConcurrentHashMap$ValueIterator.next(ConcurrentHashMap.java:3439)
at
org.apache.ignite.internal.processors.cache.distributed.dht.GridDhtPartitionsEvictor$1.call(GridDhtPartitionsEvictor.java:84)
at
org.apache.ignite.internal.processors.cache.distributed.dht.GridDhtPartitionsEvictor$1.call(GridDhtPartitionsEvictor.java:73)
at
org.apache.ignite.internal.util.IgniteUtils.wrapThreadLoader(IgniteUtils.java:6695)
at
org.apache.ignite.internal.processors.closure.GridClosureProcessor$2.body(GridClosureProcessor.java:967)
at
org.apache.ignite.internal.util.worker.GridWorker.run(GridWorker.java:110)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Locked ownable synchronizers:
- <0x0000000649b9cba0> (a
java.util.concurrent.ThreadPoolExecutor$Worker)
{noformat}
the following appears in logs each 2 minutes:
{noformat}
#### INFO 2019-07-08 12:21:45.081 (1562581305081) [sys-#98168]
[GridDhtPartitionsEvictor] > Eviction in progress
[grp=CUSTPRODINVOICEDISCUSAGE, remainingCnt=102]
{noformat}
remainingCnt remains the same once it reached 102 (the very first line in the
logs was with value equal to 101).
Some other facts:
we have a heapdump taken for *topVer = 900* . the problem appeared after
*topVer = 790*, but it looks like it was silently waiting from *topVer = 641*
(about 24 hours back).
There were 259 topology changes between 900 and 641.
All 102 GridDhtLocalPartitions can be found in the heapdump:
{noformat}
select * from
"org.apache.ignite.internal.processors.cache.distributed.dht.GridDhtLocalPartition"
t where delayedRenting = true
{noformat}
They all have status = 65537 , which means (according to
org.apache.ignite.internal.processors.cache.distributed.dht.GridDhtLocalPartition#state):
reservations(65537) = 1
getPartState(65537) = OWNING
There are also 26968 instances of
org.apache.ignite.internal.processors.cache.distributed.dht.GridDhtPartitionTopologyImpl$$Lambda$70,
that are created by
org.apache.ignite.internal.processors.cache.distributed.dht.GridDhtPartitionTopologyImpl#checkEvictions
method.
26418 of 26968 refer to AtomicInteger instance with value = 102:
26418/102 = 259 = 900 - 641 (see topology info above).
The key thing seen from the heapdump is that topVer = 641 or topVer = 642 was
the last topology where these 102 partitions were assigned to the current
ignite server node.
{noformat}
select
t.this
,t.this['clientEvtChange'] as clientEvtChange
,t.this['topVer.topVer'] as topVer
,t.this['assignment.elementData'][555]['elementData'][0]['hostNames.elementData'][0]
as primary_part
,t.this['assignment.elementData'][555]['elementData'][1]['hostNames.elementData'][0]
as secondary_part
from org.apache.ignite.internal.processors.affinity.HistoryAffinityAssignment t
where length(t.this['assignment.elementData']) = 1024
order by topVer
{noformat}
!image-2019-07-10-16-07-37-185.png!
The connection of a client node at topVer = 790 somehow triggered the
GridDhtPartitionsEvictor loop to execute.
Summary:
1) it is seen that 102 partitions has one reservation and OWNING state.
2) they were backup partitions.
3) for some reason their eviction has been silently delaying (because of
reservations), but each topology change seemed to trigger eviction attempt.
4) something managed to make
org.apache.ignite.internal.processors.cache.distributed.dht.GridDhtPartitionsEvictor#evictPartitionAsync
to run never exiting.
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