cgspace-notes/content/posts/2018-04.md

title	date	author	tags
April, 2018	2018-04-01T16:13:54+02:00	Alan Orth	Notes

2018-04-01

• I tried to test something on DSpace Test but noticed that it's down since god knows when
• Catalina logs at least show some memory errors yesterday:

Mar 31, 2018 10:26:42 PM org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor run
SEVERE: Unexpected death of background thread ContainerBackgroundProcessor[StandardEngine[Catalina]] 
java.lang.OutOfMemoryError: Java heap space

Exception in thread "ContainerBackgroundProcessor[StandardEngine[Catalina]]" java.lang.OutOfMemoryError: Java heap space

• So this is getting super annoying
• I ran all system updates on DSpace Test and rebooted it
• For some reason Listings and Reports is not giving any results for any queries now...
• I posted a message on Yammer to ask if people are using the Duplicate Check step from the Metadata Quality Module
• Help Lili Szilagyi with a question about statistics on some CCAFS items

2018-04-04

• Peter noticed that there were still some old CRP names on CGSpace, because I hadn't forced the Discovery index to be updated after I fixed the others last week
• For completeness I re-ran the CRP corrections on CGSpace:

$ ./fix-metadata-values.py -i /tmp/Correct-21-CRPs-2018-03-16.csv -f cg.contributor.crp -t correct -m 230 -db dspace -u dspace -p 'fuuu'
Fixed 1 occurences of: AGRICULTURE FOR NUTRITION AND HEALTH

• Then started a full Discovery index:

$ export JAVA_OPTS='-Dfile.encoding=UTF-8 -Xmx1024m'
$ time schedtool -D -e ionice -c2 -n7 nice -n19 dspace index-discovery -b

real    76m13.841s
user    8m22.960s
sys     2m2.498s

• Elizabeth from CIAT emailed to ask if I could help her by adding ORCID identifiers to all of Joseph Tohme's items
• I used my add-orcid-identifiers-csv.py script:

$ ./add-orcid-identifiers-csv.py -i /tmp/jtohme-2018-04-04.csv -db dspace -u dspace -p 'fuuu'

• The CSV format of jtohme-2018-04-04.csv was:

dc.contributor.author,cg.creator.id
"Tohme, Joseph M.",Joe Tohme: 0000-0003-2765-7101

• There was a quoting error in my CRP CSV and the replacements for Forests, Trees and Agroforestry got messed up
• So I fixed them and had to re-index again!
• I started preparing the git branch for the the DSpace 5.5→5.8 upgrade:

$ git checkout -b 5_x-dspace-5.8 5_x-prod
$ git reset --hard ilri/5_x-prod
$ git rebase -i dspace-5.8

• I was prepared to skip some commits that I had cherry picked from the upstream dspace-5_x branch when we did the DSpace 5.5 upgrade (see notes on 2016-10-19 and 2017-12-17):
  • [DS-3246] Improve cleanup in recyclable components (upstream commit on dspace-5_x: 9f0f5940e7921765c6a22e85337331656b18a403)
  • [DS-3250] applying patch provided by Atmire (upstream commit on dspace-5_x: c6fda557f731dbc200d7d58b8b61563f86fe6d06)
  • bump up to latest minor pdfbox version (upstream commit on dspace-5_x: b5330b78153b2052ed3dc2fd65917ccdbfcc0439)
  • DS-3583 Usage of correct Collection Array (#1731) (upstream commit on dspace-5_x: c8f62e6f496fa86846bfa6bcf2d16811087d9761)
• ... but somehow git knew, and didn't include them in my interactive rebase!
• I need to send this branch to Atmire and also arrange payment (see ticket #560 in their tracker)
• Fix Sisay's SSH access to the new DSpace Test server (linode19)

2018-04-05

• Fix Sisay's sudo access on the new DSpace Test server (linode19)
• The reindexing process on DSpace Test took forever yesterday:

$ time schedtool -D -e ionice -c2 -n7 nice -n19 dspace index-discovery -b

real    599m32.961s
user    9m3.947s
sys     2m52.585s

• So we really should not use this Linode block storage for Solr
• Assetstore might be fine but would complicate things with configuration and deployment (ughhh)
• Better to use Linode block storage only for backup
• Help Peter with the GDPR compliance / reporting form for CGSpace
• DSpace Test crashed due to memory issues again:

# grep -c 'java.lang.OutOfMemoryError: Java heap space' /var/log/tomcat7/catalina.out
16

• I ran all system updates on DSpace Test and rebooted it
• Proof some records on DSpace Test for Udana from IWMI
• He has done better with the small syntax and consistency issues but then there are larger concerns with not linking to DOIs, copying titles incorrectly, etc

2018-04-10

• I got a notice that CGSpace CPU usage was very high this morning
• Looking at the nginx logs, here are the top users today so far:

# zcat --force /var/log/nginx/*.log /var/log/nginx/*.log.1 | grep -E "10/Apr/2018" | awk '{print $1}' | sort | uniq -c | sort -n | tail -n 10                                                                                                   
    282 207.46.13.112
    286 54.175.208.220
    287 207.46.13.113
    298 66.249.66.153
    322 207.46.13.114
    780 104.196.152.243
   3994 178.154.200.38
   4295 70.32.83.92
   4388 95.108.181.88
   7653 45.5.186.2

• 45.5.186.2 is of course CIAT
• 95.108.181.88 appears to be Yandex:

95.108.181.88 - - [09/Apr/2018:06:34:16 +0000] "GET /bitstream/handle/10568/21794/ILRI_logo_usage.jpg.jpg HTTP/1.1" 200 2638 "-" "Mozilla/5.0 (compatible; YandexBot/3.0; +http://yandex.com/bots)"

• And for some reason Yandex created a lot of Tomcat sessions today:

$ grep -c -E 'session_id=[A-Z0-9]{32}:ip_addr=95.108.181.88' dspace.log.2018-04-10
4363

• 70.32.83.92 appears to be some harvester we've seen before, but on a new IP
• They are not creating new Tomcat sessions so there is no problem there
• 178.154.200.38 also appears to be Yandex, and is also creating many Tomcat sessions:

$ grep -c -E 'session_id=[A-Z0-9]{32}:ip_addr=178.154.200.38' dspace.log.2018-04-10
3982

• I'm not sure why Yandex creates so many Tomcat sessions, as its user agent should match the Crawler Session Manager valve
• Let's try a manual request with and without their user agent:

$ http --print Hh https://cgspace.cgiar.org/bitstream/handle/10568/21794/ILRI_logo_usage.jpg.jpg 'User-Agent:Mozilla/5.0 (compatible; YandexBot/3.0; +http://yandex.com/bots)'
GET /bitstream/handle/10568/21794/ILRI_logo_usage.jpg.jpg HTTP/1.1
Accept: */*
Accept-Encoding: gzip, deflate
Connection: keep-alive
Host: cgspace.cgiar.org
User-Agent: Mozilla/5.0 (compatible; YandexBot/3.0; +http://yandex.com/bots)

HTTP/1.1 200 OK
Connection: keep-alive
Content-Language: en-US
Content-Length: 2638
Content-Type: image/jpeg;charset=ISO-8859-1
Date: Tue, 10 Apr 2018 05:18:37 GMT
Expires: Tue, 10 Apr 2018 06:18:37 GMT
Last-Modified: Tue, 25 Apr 2017 07:05:54 GMT
Server: nginx
Strict-Transport-Security: max-age=15768000
Vary: User-Agent
X-Cocoon-Version: 2.2.0
X-Content-Type-Options: nosniff
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 1; mode=block

$ http --print Hh https://cgspace.cgiar.org/bitstream/handle/10568/21794/ILRI_logo_usage.jpg.jpg                                                                              
GET /bitstream/handle/10568/21794/ILRI_logo_usage.jpg.jpg HTTP/1.1
Accept: */*
Accept-Encoding: gzip, deflate
Connection: keep-alive
Host: cgspace.cgiar.org
User-Agent: HTTPie/0.9.9

HTTP/1.1 200 OK
Connection: keep-alive
Content-Language: en-US
Content-Length: 2638
Content-Type: image/jpeg;charset=ISO-8859-1
Date: Tue, 10 Apr 2018 05:20:08 GMT
Expires: Tue, 10 Apr 2018 06:20:08 GMT
Last-Modified: Tue, 25 Apr 2017 07:05:54 GMT
Server: nginx
Set-Cookie: JSESSIONID=31635DB42B66D6A4208CFCC96DD96875; Path=/; Secure; HttpOnly
Strict-Transport-Security: max-age=15768000
Vary: User-Agent
X-Cocoon-Version: 2.2.0
X-Content-Type-Options: nosniff
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 1; mode=block

• So it definitely looks like Yandex requests are getting assigned a session from the Crawler Session Manager valve
• And if I look at the DSpace log I see its IP sharing a session with other crawlers like Google (66.249.66.153)
• Indeed the number of Tomcat sessions appears to be normal:

• In other news, it looks like the number of total requests processed by nginx in March went down from the previous months:

# time zcat --force /var/log/nginx/* | grep -cE "[0-9]{1,2}/Mar/2018"
2266594

real    0m13.658s
user    0m16.533s
sys     0m1.087s

• In other other news, the database cleanup script has an issue again:

$ dspace cleanup -v
...
Error: ERROR: update or delete on table "bitstream" violates foreign key constraint "bundle_primary_bitstream_id_fkey" on table "bundle"
  Detail: Key (bitstream_id)=(151626) is still referenced from table "bundle".

• The solution is, as always:

$ psql dspace -c 'update bundle set primary_bitstream_id=NULL where primary_bitstream_id in (151626);'
UPDATE 1

• Looking at abandoned connections in Tomcat:

# zcat /var/log/tomcat7/catalina.out.[1-9].gz | grep -c 'org.apache.tomcat.jdbc.pool.ConnectionPool abandon'
2115

• Apparently from these stacktraces we should be able to see which code is not closing connections properly
• Here's a pretty good overview of days where we had database issues recently:

# zcat /var/log/tomcat7/catalina.out.[1-9].gz | grep 'org.apache.tomcat.jdbc.pool.ConnectionPool abandon' | awk '{print $1,$2, $3}' | sort | uniq -c | sort -n
      1 Feb 18, 2018
      1 Feb 19, 2018
      1 Feb 20, 2018
      1 Feb 24, 2018
      2 Feb 13, 2018
      3 Feb 17, 2018
      5 Feb 16, 2018
      5 Feb 23, 2018
      5 Feb 27, 2018
      6 Feb 25, 2018
     40 Feb 14, 2018
     63 Feb 28, 2018
    154 Mar 19, 2018
    202 Feb 21, 2018
    264 Feb 26, 2018
    268 Mar 21, 2018
    524 Feb 22, 2018
    570 Feb 15, 2018

• In Tomcat 8.5 the removeAbandoned property has been split into two: removeAbandonedOnBorrow and removeAbandonedOnMaintenance
• See: https://tomcat.apache.org/tomcat-8.5-doc/jndi-datasource-examples-howto.html#Database_Connection_Pool_(DBCP_2)_Configurations
• I assume we want removeAbandonedOnBorrow and make updates to the Tomcat 8 templates in Ansible
• After reading more documentation I see that Tomcat 8.5's default DBCP seems to now be Commons DBCP2 instead of Tomcat DBCP
• It can be overridden in Tomcat's server.xml by setting factory="org.apache.tomcat.jdbc.pool.DataSourceFactory" in the <Resource>
• I think we should use this default, so we'll need to remove some other settings that are specific to Tomcat's DBCP like jdbcInterceptors and abandonWhenPercentageFull
• Merge the changes adding ORCID identifier to advanced search and Atmire Listings and Reports (#371)
• Fix one more issue of missing XMLUI strings (for CRP subject when clicking "view more" in the Discovery sidebar)
• I told Udana to fix the citation and abstract of the one item, and to correct the dc.language.iso for the five Spanish items in his Book Chapters collection
• Then we can import the records to CGSpace

2018-04-11

• DSpace Test (linode19) crashed again some time since yesterday:

# grep -c 'java.lang.OutOfMemoryError: Java heap space' /var/log/tomcat7/catalina.out
168

• I ran all system updates and rebooted the server

2018-04-12

• I caught wind of an interesting XMLUI performance optimization coming in DSpace 6.3: https://jira.duraspace.org/browse/DS-3883
• I asked for it to be ported to DSpace 5.x

2018-04-13

• Add PII-LAM_CSAGender to CCAFS Phase II project tags in input-forms.xml

2018-04-15

• While testing an XMLUI patch for DS-3883 I noticed that there is still some remaining Authority / Solr configuration left that we need to remove:

2018-04-14 18:55:25,841 ERROR org.dspace.authority.AuthoritySolrServiceImpl @ Authority solr is not correctly configured, check "solr.authority.server" property in the dspace.cfg
java.lang.NullPointerException

• I assume we need to remove authority from the consumers in dspace/config/dspace.cfg:

event.dispatcher.default.consumers = authority, versioning, discovery, eperson, harvester, statistics,batchedit, versioningmqm

• I see the same error on DSpace Test so this is definitely a problem
• After disabling the authority consumer I no longer see the error
• I merged a pull request to the 5_x-prod branch to clean that up (#372)
• File a ticket on DSpace's Jira for the target="_blank" security and performance issue (DS-3891)
• I re-deployed DSpace Test (linode19) and was surprised by how long it took the ant update to complete:

BUILD SUCCESSFUL
Total time: 4 minutes 12 seconds

• The Linode block storage is much slower than the instance storage
• I ran all system updates and rebooted DSpace Test (linode19)

2018-04-16

• Communicate with Bioversity about their project to migrate their e-Library (Typo3) and Sci-lit databases to CGSpace

2018-04-18

• IWMI people are asking about building a search query that outputs RSS for their reports
• They want the same results as this Discovery query: https://cgspace.cgiar.org/discover?filtertype_1=dateAccessioned&filter_relational_operator_1=contains&filter_1=2018&submit_apply_filter=&query=&scope=10568%2F16814&rpp=100&sort_by=dc.date.issued_dt&order=desc
• They will need to use OpenSearch, but I can't remember all the parameters
• Apparently search sort options for OpenSearch are in dspace.cfg:

webui.itemlist.sort-option.1 = title:dc.title:title
webui.itemlist.sort-option.2 = dateissued:dc.date.issued:date
webui.itemlist.sort-option.3 = dateaccessioned:dc.date.accessioned:date
webui.itemlist.sort-option.4 = type:dc.type:text

• They want items by issue date, so we need to use sort option 2
• According to the DSpace Manual there are only the following parameters to OpenSearch: format, scope, rpp, start, and sort_by
• The OpenSearch query parameter expects a Discovery search filter that is defined in dspace/config/spring/api/discovery.xml
• So for IWMI they should be able to use something like this: https://cgspace.cgiar.org/open-search/discover?query=dateIssued:2018&scope=10568/16814&sort_by=2&order=DESC&format=rss
• There are also rpp (results per page) and start parameters but in my testing now on DSpace 5.5 they behave very strangely
• For example, set rpp=1 and then check the results for start values of 0, 1, and 2 and they are all the same!
• If I have time I will check if this behavior persists on DSpace 6.x on the official DSpace demo and file a bug
• Also, the DSpace Manual as of 5.x has very poor documentation for OpenSearch
• They don't tell you to use Discovery search filters in the query (with format query=dateIssued:2018)
• They don't tell you that the sort options are actually defined in dspace.cfg (ie, you need to use 2 instead of dc.date.issued_dt)
• They are missing the order parameter (ASC vs DESC)
• I notice that DSpace Test has crashed again, due to memory:

# grep -c 'java.lang.OutOfMemoryError: Java heap space' /var/log/tomcat7/catalina.out
178

• I will increase the JVM heap size from 5120M to 6144M, though we don't have much room left to grow as DSpace Test (linode19) is using a smaller instance size than CGSpace
• Gabriela from CIP asked if I could send her a list of all CIP authors so she can do some replacements on the name formats
• I got a list of all the CIP collections manually and use the same query that I used in August, 2017:

dspace#= \copy (select distinct text_value, count(*) from metadatavalue where metadata_field_id = (select metadata_field_id from metadatafieldregistry where element = 'contributor' and qualifier = 'author') AND resource_type_id = 2 AND resource_id IN (select item_id from collection2item where collection_id IN (select resource_id from handle where handle in ('10568/89347', '10568/88229', '10568/53086', '10568/53085', '10568/69069', '10568/53087', '10568/53088', '10568/53089', '10568/53090', '10568/53091', '10568/53092', '10568/70150', '10568/53093', '10568/64874', '10568/53094'))) group by text_value order by count desc) to /tmp/cip-authors.csv with csv;

2018-04-19

• Run updates on DSpace Test (linode19) and reboot the server
• Also try deploying updated GeoLite database during ant update while re-deploying code:

$ ant update update_geolite clean_backups

• I also re-deployed CGSpace (linode18) to make the ORCID search, authority cleanup, CCAFS project tag PII-LAM_CSAGender live
• When re-deploying I also updated the GeoLite databases so I hope the country stats become more accurate...
• After re-deployment I ran all system updates on the server and rebooted it
• After the reboot I forced a reïndexing of the Discovery to populate the new ORCID index:

$ time schedtool -D -e ionice -c2 -n7 nice -n19 dspace index-discovery -b

real    73m42.635s
user    8m15.885s
sys     2m2.687s

• This time is with about 70,000 items in the repository

2018-04-20

• Gabriela from CIP emailed to say that CGSpace was returning a white page, but I haven't seen any emails from UptimeRobot
• I confirm that it's just giving a white page around 4:16
• The DSpace logs show that there are no database connections:

org.apache.tomcat.jdbc.pool.PoolExhaustedException: [http-bio-127.0.0.1-8443-exec-715] Timeout: Pool empty. Unable to fetch a connection in 5 seconds, none available[size:250; busy:18; idle:0; lastwait:5000].

• And there have been shit tons of errors in the last (starting only 20 minutes ago luckily):

# grep -c 'org.apache.tomcat.jdbc.pool.PoolExhaustedException' /home/cgspace.cgiar.org/log/dspace.log.2018-04-20
32147

• I can't even log into PostgreSQL as the postgres user, WTF?

$ psql -c 'select * from pg_stat_activity' | grep -o -E '(dspaceWeb|dspaceApi|dspaceCli)' | sort | uniq -c 
^C

• Here are the most active IPs today:

# zcat --force /var/log/nginx/*.log /var/log/nginx/*.log.1 | grep -E "20/Apr/2018" | awk '{print $1}' | sort | uniq -c | sort -n | tail -n 10
    917 207.46.13.182
    935 213.55.99.121
    970 40.77.167.134
    978 207.46.13.80
   1422 66.249.64.155
   1577 50.116.102.77
   2456 95.108.181.88
   3216 104.196.152.243
   4325 70.32.83.92
  10718 45.5.184.2

• It doesn't even seem like there is a lot of traffic compared to the previous days:

# zcat --force /var/log/nginx/*.log /var/log/nginx/*.log.1 | grep -E "20/Apr/2018" | wc -l
74931
# zcat --force /var/log/nginx/*.log.1 /var/log/nginx/*.log.2.gz| grep -E "19/Apr/2018" | wc -l
91073
# zcat --force /var/log/nginx/*.log.2.gz /var/log/nginx/*.log.3.gz| grep -E "18/Apr/2018" | wc -l
93459

• I tried to restart Tomcat but systemctl hangs
• I tried to reboot the server from the command line but after a few minutes it didn't come back up
• Looking at the Linode console I see that it is stuck trying to shut down
• Even "Reboot" via Linode console doesn't work!
• After shutting it down a few times via the Linode console it finally rebooted
• Everything is back but I have no idea what caused this—I suspect something with the hosting provider
• Also super weird, the last entry in the DSpace log file is from 2018-04-20 16:35:09, and then immediately it goes to 2018-04-20 19:15:04 (three hours later!):

2018-04-20 16:35:09,144 ERROR org.dspace.app.util.AbstractDSpaceWebapp @ Failed to record shutdown in Webapp table.
org.apache.tomcat.jdbc.pool.PoolExhaustedException: [localhost-startStop-2] Timeout: Pool empty. Unable to fetch a connection in 5 seconds, none available[size:250; busy:18; idle
:0; lastwait:5000].
        at org.apache.tomcat.jdbc.pool.ConnectionPool.borrowConnection(ConnectionPool.java:685)
        at org.apache.tomcat.jdbc.pool.ConnectionPool.getConnection(ConnectionPool.java:187)
        at org.apache.tomcat.jdbc.pool.DataSourceProxy.getConnection(DataSourceProxy.java:128)
        at org.dspace.storage.rdbms.DatabaseManager.getConnection(DatabaseManager.java:632)
        at org.dspace.core.Context.init(Context.java:121)
        at org.dspace.core.Context.<init>(Context.java:95)
        at org.dspace.app.util.AbstractDSpaceWebapp.deregister(AbstractDSpaceWebapp.java:97)
        at org.dspace.app.util.DSpaceContextListener.contextDestroyed(DSpaceContextListener.java:146)
        at org.apache.catalina.core.StandardContext.listenerStop(StandardContext.java:5115)
        at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5779)
        at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:224)
        at org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1588)
        at org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1577)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
2018-04-20 19:15:04,006 INFO  org.dspace.core.ConfigurationManager @ Loading from classloader: file:/home/cgspace.cgiar.org/config/dspace.cfg

• Very suspect!

2018-04-24

• Testing my Ansible playbooks with a clean and updated installation of Ubuntu 18.04 and I fixed some issues that I hadn't run into a few weeks ago
• There seems to be a new issue with Java dependencies, though
• The default-jre package is going to be Java 10 on Ubuntu 18.04, but I want to use openjdk-8-jre-headless (well, the JDK actually, but it uses this JRE)
• Tomcat and Ant are fine with Java 8, but the maven package wants to pull in Java 10 for some reason
• Looking closer, I see that maven depends on java7-runtime-headless, which is indeed provided by openjdk-8-jre-headless
• So it must be one of Maven's dependencies...
• I will watch it for a few days because it could be an issue that will be resolved before Ubuntu 18.04's release
• Otherwise I will post a bug to the ubuntu-release mailing list
• Looks like the only way to fix this is to install openjdk-8-jdk-headless before (so it pulls in the JRE) in a separate transaction, or to manually install openjdk-8-jre-headless in the same apt transaction as maven
• Also, I started porting PostgreSQL 9.6 into the Ansible infrastructure scripts
• This should be a drop in I believe, though I will definitely test it more locally as well as on DSpace Test once we move to DSpace 5.8 and Ubuntu 18.04 in the coming months

2018-04-25

• Still testing the Ansible infrastructure playbooks for Ubuntu 18.04, Tomcat 8.5, and PostgreSQL 9.6
• One other new thing I notice is that PostgreSQL 9.6 no longer uses createuser and nocreateuser, as those have actually meant superuser and nosuperuser and have been deprecated for ten years
• So for my notes, when I'm importing a CGSpace database dump I need to amend my notes to give super user permission to a user, rather than create user:

$ psql dspacetest -c 'alter user dspacetest superuser;'
$ pg_restore -O -U dspacetest -d dspacetest -W -h localhost /tmp/dspace_2018-04-18.backup

• There's another issue with Tomcat in Ubuntu 18.04:

25-Apr-2018 13:26:21.493 SEVERE [http-nio-127.0.0.1-8443-exec-1] org.apache.coyote.AbstractProtocol$ConnectionHandler.process Error reading request, ignored
 java.lang.NoSuchMethodError: java.nio.ByteBuffer.position(I)Ljava/nio/ByteBuffer;
        at org.apache.coyote.http11.Http11InputBuffer.init(Http11InputBuffer.java:688)
        at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:672)
        at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
        at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790)
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459)
        at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:748)

• There's a Debian bug about this from a few weeks ago
• Apparently Tomcat was compiled with Java 9, so doesn't work with Java 8

2018-04-29

• DSpace Test crashed again, looks like memory issues again
• JVM heap size was last increased to 6144m but the system only has 8GB total so there's not much we can do here other than get a bigger Linode instance or remove the massive Solr Statistics data

2018-04-30

• DSpace Test crashed again
• I will email the CGSpace team to ask them whether or not we want to commit to having a public test server that accurately mirrors CGSpace (ie, to upgrade to the next largest Linode)