Start Riak crashing after 30 seconds - solr

Question

$ riak start crashing after 30 seconds of its start. I'm having following (changes) settings in my riak.conf:
search = on
storage_backend = leveldb
riak_control = on
crash.log contains the following:
2016-06-30 14:49:38 =ERROR REPORT====
** Generic server yz_solr_proc terminating
** Last message in was {check_solr,0}
** When Server state == {state,"./data/yz",#Port<0.9441>,8093,8985}
** Reason for termination ==
** "solr didn't start in alloted time"
2016-06-30 14:49:38 =CRASH REPORT====
crasher:
initial call: yz_solr_proc:init/1
pid: <0.582.0>
registered_name: yz_solr_proc
exception exit: {"solr didn't start in alloted time",[{gen_server,terminate,6,[{file,"gen_server.erl"},{line,744}]},{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,239}]}]}
ancestors: [yz_solr_sup,yz_sup,<0.578.0>]
messages: [{'EXIT',#Port<0.9441>,normal}]
links: [<0.580.0>]
dictionary: []
trap_exit: true
status: running
heap_size: 376
stack_size: 27
reductions: 16170
neighbours:
2016-06-30 14:49:38 =SUPERVISOR REPORT====
Supervisor: {local,yz_solr_sup}
Context: child_terminated
Reason: "solr didn't start in alloted time"
Offender: [{pid,<0.582.0>},{name,yz_solr_proc},{mfargs,{yz_solr_proc,start_link,["./data/yz","./data/yz_temp",8093,8985]}},{restart_type,permanent},{shutdown,5000},{child_type,worker}]
2016-06-30 14:49:39 =ERROR REPORT====
** Generic server yz_solr_proc terminating
** Last message in was {#Port<0.12204>,{exit_status,1}}
** When Server state == {state,"./data/yz",#Port<0.12204>,8093,8985}
** Reason for termination ==
** {"solr OS process exited",1}
2016-06-30 14:49:39 =CRASH REPORT====
crasher:
initial call: yz_solr_proc:init/1
pid: <0.7631.0>
registered_name: yz_solr_proc
exception exit: {{"solr OS process exited",1},[{gen_server,terminate,6,[{file,"gen_server.erl"},{line,744}]},{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,239}]}]}
ancestors: [yz_solr_sup,yz_sup,<0.578.0>]
messages: [{'EXIT',#Port<0.12204>,normal}]
links: [<0.580.0>]
dictionary: []
trap_exit: true
status: running
heap_size: 1598
stack_size: 27
reductions: 8968
neighbours:
2016-06-30 14:49:39 =SUPERVISOR REPORT====
Supervisor: {local,yz_solr_sup}
Context: child_terminated
Reason: {"solr OS process exited",1}
Offender: [{pid,<0.7631.0>},{name,yz_solr_proc},{mfargs,{yz_solr_proc,start_link,["./data/yz","./data/yz_temp",8093,8985]}},{restart_type,permanent},{shutdown,5000},{child_type,worker}]
2016-06-30 14:49:39 =SUPERVISOR REPORT====
Supervisor: {local,yz_solr_sup}
Context: shutdown
Reason: reached_max_restart_intensity
Offender: [{pid,<0.7631.0>},{name,yz_solr_proc},{mfargs,{yz_solr_proc,start_link,["./data/yz","./data/yz_temp",8093,8985]}},{restart_type,permanent},{shutdown,5000},{child_type,worker}]
2016-06-30 14:49:39 =SUPERVISOR REPORT====
Supervisor: {local,yz_sup}
Context: child_terminated
Reason: shutdown
Offender: [{pid,<0.580.0>},{name,yz_solr_sup},{mfargs,{yz_solr_sup,start_link,[]}},{restart_type,permanent},{shutdown,5000},{child_type,supervisor}]
2016-06-30 14:49:39 =SUPERVISOR REPORT====
Supervisor: {local,yz_sup}
Context: shutdown
Reason: reached_max_restart_intensity
Offender: [{pid,<0.580.0>},{name,yz_solr_sup},{mfargs,{yz_solr_sup,start_link,[]}},{restart_type,permanent},{shutdown,5000},{child_type,supervisor}]

Answer 1

Make sure the ports used by Solr are available. The defaults are 8093 for search, and 8985 for JMX.
Tune your system to improve performance. Follow Improving Performance for Linux.
In riak.conf, increase the JVM's heap size, the default of 1G is often not enough. For example, search.solr.jvm_options=-d64 -Xms2g -Xmx4g -XX:+UseStringCache -XX:+UseCompressedOops (see Search Settings).
On a slow machine, Solr just may take longer to start. Try increasing search.solr.start_timeout.
Solr directories must be writable (usually /var/lib/riak/data/yz*), and a compatible JVM be used.

Answer 2

Riak's internal solr use localhost and 127.0.0.1 as default host. So it should have defined in /etc/hosts file:
127.0.0.1 localhost
FYI, if you use windows your hosts file location could be different.