Interpret ElasticSearch Out of Memory error

The first part of your log concerns Elasticsearch Garbage Collection logging format

[2015-04-07 16:19:58,235][INFO][monitor.jvm][NODE1]

garbage collection run
```
[gc] 
```
new parallel garbage collector
```
[ParNew]
```
GC took 822ms
```
duration [822ms], 
```
one collection run, with a total of 4.3 seconds
```
collections [1]/[4.3s]
```
usage number of pool 'memory', it was previously 966.1mb, now is 766.9mb, with a total pool size of 990.7mb
```
memory [966.1mb]->[766.9mb]/[990.7mb], 
```
usage numbers for pool 'code cache'
```
[Code Cache] [13.1mb]->[13.1mb]/[48mb]
```

usage numbers for pool 'Par Eden Space'

[Par Eden Space] [266.2mb]->[75.6mb]/[266.2mb]

usage numbers for pool 'Par Survivor Space'

[Par Survivor Space] [8.9mb]->[0b]/[33.2mb]

usage numbers for pool 'CMS Old Gen'

[CMS Old Gen] [690.8mb]->[691.2mb]/[691.2mb]

usage numbers for pool 'CMS Perm Gen'

[CMS Perm Gen] [33.6mb]->[33.6mb]/[82mb]

And if you have noticed that your memory pool is almost 1G. I hope that this gives you a hint!

CodeHunter