# \[ElasticSearch 2.2.0\] I am occasionally getting Process Cluster Event Timeout Exception\[failed to process cluster event (put-mapping \[as\]) within 30s\] while bulk indexing documents

**URL:** <https://discuss.elastic.co/t/elasticsearch-2-2-0-i-am-occasionally-getting-process-cluster-event-timeout-exception-failed-to-process-cluster-event-put-mapping-as-within-30s-while-bulk-indexing-documents/42305>\
**Category:** Elasticsearch\
**Created:** [February 20, 2016, 11:46am UTC](https://discuss.elastic.co/t/elasticsearch-2-2-0-i-am-occasionally-getting-process-cluster-event-timeout-exception-failed-to-process-cluster-event-put-mapping-as-within-30s-while-bulk-indexing-documents/42305 "2016-02-20T11:46:25Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![dynamicscope](https://avatars.discourse-cdn.com/v4/letter/d/e9bcb4/32.png) [@dynamicscope](https://discuss.elastic.co/u/dynamicscope)\
**Post date:** [February 21, 2016, 11:42pm UTC](https://discuss.elastic.co/t/elasticsearch-2-2-0-i-am-occasionally-getting-process-cluster-event-timeout-exception-failed-to-process-cluster-event-put-mapping-as-within-30s-while-bulk-indexing-documents/42305/3 "2016-02-21T23:42:55Z")

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It's ElasticSearch v.2.2.0

{AWS EC2 m4.xlarge : 4 vCPUs, 16 GiB Mem} x 3

node-1: master/data  
node-2: data-only  
node-3: data-only

ES\_HEAP\_SIZE: 10g

Data: 100,000,000 docs  
Indices: 13000  
Shards: 3 / index  
Replica: 1

After a while, master throws the following OOM 😭

```
[2016-02-21 22:03:47,104][WARN][monitor.jvm] [Hulk] [gc][old][18835][175] duration [3m], collections [5]/[3m], total [3m]/[1h], memory [9.9gb]->[9.9gb]/[9.9gb], all_pools {[young] [266.2mb]->[266.2mb]/[266.2mb]}{[survivor] [33.2mb]->[33.2mb]/[33.2mb]}{[old] [9.6gb]->[9.6gb]/[9.6gb]}
[2016-02-21 22:31:27,605][WARN][transport.netty] [Hulk] exception caught on transport layer [[id: 0x180573ba, /172.31.7.130:40806 => /172.31.9.135:9300]], closing connection
java.lang.OutOfMemoryError: Java heap space
        at org.apache.lucene.util.CharsRefBuilder.<init>(CharsRefBuilder.java:35)
        at org.elasticsearch.common.io.stream.StreamInput.<init>(StreamInput.java:246) 

```

Is the memory too low?  
What's happening inside the master's memory. Data nodes seem working okay.

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