# Write filter for multiline in logstash filter

**URL:** <https://discuss.elastic.co/t/write-filter-for-multiline-in-logstash-filter/103888>\
**Category:** Logstash\
**Created:** [October 13, 2017, 11:58am UTC](https://discuss.elastic.co/t/write-filter-for-multiline-in-logstash-filter/103888 "2017-10-13T11:58:28Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![tharu85](https://avatars.discourse-cdn.com/v4/letter/t/e95f7d/32.png) [@tharu85](https://discuss.elastic.co/u/tharu85)\
**Post date:** [October 13, 2017, 11:58am UTC](https://discuss.elastic.co/t/write-filter-for-multiline-in-logstash-filter/103888/1 "2017-10-13T11:58:28Z")

</div>

I need to write a logstash filter for linux multiline log using GROK. My log sample is like as below.

```
2017-05-22T04:28:12.444+05:30 WARN [BlockingBatchedESOutput] Error while waiting for healthy Elasticsearch cluster. Not flushing.
java.util.concurrent.TimeoutException: Write-active index didn't get healthy within timeout
at org.graylog2.indexer.cluster.Cluster.waitForConnectedAndDeflectorHealthy(Cluster.java:221) ~[graylog.jar:?]
at org.graylog2.indexer.cluster.Cluster.waitForConnectedAndDeflectorHealthy(Cluster.java:232) ~[graylog.jar:?]
at org.graylog2.outputs.BlockingBatchedESOutput.flush(BlockingBatchedESOutput.java:121) [graylog.jar:?]
at org.graylog2.outputs.BlockingBatchedESOutput.writeMessageEntry(BlockingBatchedESOutput.java:114) [graylog.jar:?]
at org.graylog2.outputs.BlockingBatchedESOutput.write(BlockingBatchedESOutput.java:96) [graylog.jar:?]
at org.graylog2.buffers.processors.OutputBufferProcessor$1.run(OutputBufferProcessor.java:194) [graylog.jar:?]
at com.codahale.metrics.InstrumentedExecutorService$InstrumentedRunnable.run(InstrumentedExecutorService.java:176) [graylog.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_131]
at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_131]
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:1.8.0_131]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?:1.8.0_131]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_131]

```

Please help me to write a logstash filter with grok pattern

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<div class="post-metadata">

**Author:** ![magnusbaeck](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/magnusbaeck/32/44943_2.png) [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)\
**Post date:** [October 17, 2017, 6:44pm UTC](https://discuss.elastic.co/t/write-filter-for-multiline-in-logstash-filter/103888/2 "2017-10-17T18:44:14Z")

</div>

Have you tried using the grok constructor web site?

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [November 14, 2017, 6:53pm UTC](https://discuss.elastic.co/t/write-filter-for-multiline-in-logstash-filter/103888/3 "2017-11-14T18:53:51Z")

</div>

Closed on November 14, 2017, 6:53pm UTC

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