# Dremio Hangs on startup!

**URL:** <https://community.dremio.com/t/dremio-hangs-on-startup/641>\
**Category:** Uncategorized\
**Created:** [January 15, 2018, 8:59am UTC](https://community.dremio.com/t/dremio-hangs-on-startup/641 "2018-01-15T08:59:43Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![ravi.eze](https://avatars.discourse-cdn.com/v4/letter/r/f04885/32.png) [@ravi.eze](https://community.dremio.com/u/ravi.eze)\
**Post date:** [January 15, 2018, 8:59am UTC](https://community.dremio.com/t/dremio-hangs-on-startup/641/1 "2018-01-15T08:59:43Z")

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1. The Mapr version i m using is 5.2.0
2. i downloaded the tarball from dremio: dremio-community-1.3.1-201712020435270019-a7af5c8-mapr.tar.gz ; logged in to root user and installed the tarball with commands from: [https://docs.dremio.com/deployment/standalone-tarball.html](https://docs.dremio.com/deployment/standalone-tarball.html) (removing the sudo part as i am already root)
3. once all the installation was done i used this command: service dremio start to start dremio
4. when i do jps i see the Dremio running. HOwever, if i open its logs i see that its stuck at: Starting ZKClusterClient (full log attached) --its stuck there for ever (even after 1hr its there only) – nor is the page : http://:9047/ … opening
5. The thread dump made no sense to me (attached)

Any help is appreciated.

[dremio.zip](https://us1.discourse-cdn.com/flex020/uploads/dremio/original/1X/415cb919ad2c87b83724660de2bcfee0bad505cd.zip) (2.8 KB)

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**Author:** ![laurent](https://sea2.discourse-cdn.com/flex020/user_avatar/community.dremio.com/laurent/32/16_2.png) [@laurent](https://community.dremio.com/u/laurent)\
**Post date:** [January 15, 2018, 6:04pm UTC](https://community.dremio.com/t/dremio-hangs-on-startup/641/2 "2018-01-15T18:04:25Z")

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Any message in `server.out`? Also, do you have a zookeeper instance already (maybe provided by the MapR distribution) and running on the same port?

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**Author:** ![ravi.eze](https://avatars.discourse-cdn.com/v4/letter/r/f04885/32.png) [@ravi.eze](https://community.dremio.com/u/ravi.eze)\
**Post date:** [January 15, 2018, 6:31pm UTC](https://community.dremio.com/t/dremio-hangs-on-startup/641/3 "2018-01-15T18:31:04Z")

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Yes… but of hardly any help

```
Mon Jan 15 23:56:57 IST 2018 Starting dremio on hyd-lab4
core file size (blocks, -c) unlimited
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 30
file size (blocks, -f) unlimited
pending signals (-i) 256914
max locked memory (kbytes, -l) unlimited
max memory size (kbytes, -m) unlimited
open files (-n) 65535
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 8192
cpu time (seconds, -t) unlimited
max user processes (-u) unlimited
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited

```

We have zookeeper already running on port 2181. infact the serverl.log says it has connected to zookeeper already…

```
2018-01-15 23:57:00,780 [main] INFO com.dremio.dac.daemon.ZkServer - Starting Zookeeper
2018-01-15 23:57:01,786 [main] INFO com.dremio.dac.daemon.ZkServer - Zookeeper is up at localhost:2181
2018-01-15 23:57:01,873 [main] INFO c.d.s.coordinator.zk.ZKClusterClient - Starting ZKClusterClient

```

I have installed dremio on mapr community servers. Our mapr server version is 5.2.2 – may be it could be of some help

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**Author:** ![yufeldman](https://avatars.discourse-cdn.com/v4/letter/y/c77e96/32.png) [@yufeldman](https://community.dremio.com/u/yufeldman)\
**Post date:** [January 15, 2018, 6:33pm UTC](https://community.dremio.com/t/dremio-hangs-on-startup/641/4 "2018-01-15T18:33:01Z")

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In MapR distro you need to use MapR zookeeper for Dremio. I suggest you follow Dremio MapR documentation ([https://docs.dremio.com/deployment/yarn-deployment.html#mapr-deployment-yarn](https://docs.dremio.com/deployment/yarn-deployment.html#mapr-deployment-yarn)).

Update dremio.conf with following

> zookeeper: “\<ZOOKEEPER\_HOST\>:5181”  
> services: {  
> coordinator.embedded\_master\_zk.enabled:false  
> }

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**Author:** ![ravi.eze](https://avatars.discourse-cdn.com/v4/letter/r/f04885/32.png) [@ravi.eze](https://community.dremio.com/u/ravi.eze)\
**Post date:** [January 15, 2018, 6:38pm UTC](https://community.dremio.com/t/dremio-hangs-on-startup/641/5 "2018-01-15T18:38:29Z")

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hey!

thank u very much. It worked. Now i would like to query the mapr json db. Let me tryout. Thank you onceagain for the help extended.

Super!