ATSD Cluster Migration

These instructions describe how to upgrade an ATSD instance running on the Cloudera CDH cluster.

For non-distributed installations, refer to the following migration guide.

Versioning

Code ATSD Revision Number Java Version Cloudera Manager Version CDH Version
Old 16999 and earlier 1.7 5.1 - 5.11 5.1 - 5.9
New 17000 and later 1.8 5.12 5.10

Requirements

Disk Space

The migration procedure requires up to 30% of the current atsd_d table size to store new records before old data can be deleted.

Open Clusters > Cluster > HDFS > Status page in Cloudera Manager.

Be sure that enough configured capacity is available in HDFS.

Memory

The migration task is implemented as a Map-Reduce job and requires at least 4 GB of RAM available on each HBase region server.

Check Record Count for Testing

Log in to ATSD and open the SQL tab.

Count rows for one of the key metrics.

SELECT COUNT(*) FROM mymetric

The number must match the results after the migration.

Prepare ATSD For Upgrade

Stop ATSD.

/opt/atsd/atsd/bin/stop-atsd.sh

Take note of the table prefix specified in the /opt/atsd/atsd/conf/server.properties file.

cat /opt/atsd/atsd/conf/server.properties | grep "hbase.table.prefix" | cut -f 2 -d "="

This prefix is required in subsequent steps.

Install Java 8

Install Java 8 on the ATSD server.

Upgrade Cloudera Cluster

  • Upgrade Cloudera Manager to version 5.12.

  • Upgrade CDH to version 5.10.

  • Start HDFS, HBase, YARN and HistoryServer services.

Configure Migration Map-Reduce Job

Log in to the server where YARN ResourceManager is running.

Locate the yarn.keytab file.

sudo find / -name "yarn.keytab" | xargs ls -la | tail -n 1
-rw------- 1 yarn        hadoop        448 Jul 29 16:44 /run/cloudera-scm-agent/process/7947-yarn-RESOURCEMANAGER/yarn.keytab

Switch to the yarn user.

sudo su yarn

Initiate a Kerberos session

Obtain the fully qualified hostname of the YARN ResourceManager server.

hostname -f

Authenticate with Kerberos using the located yarn.keytab file and the full hostname of the YARN ResourceManager.

kinit -k -t /run/cloudera-scm-agent/process/7947-yarn-RESOURCEMANAGER/yarn.keytab yarn/{yarn_rm_full_hostname}

Download the migration.jar file to the temporary /tmp/migration/ directory.

mkdir /tmp/migration
curl -o /tmp/migration/migration.jar \
  https://axibase.com/public/atsd-125-migration/migration-hbase-1.2.0-cdh5.10.0.jar

Check that the current Java version is 8.

java -version

Add migration.jar, HBase configuration files, and HBase classes used by the migration job to Java and Hadoop classpaths.

export CLASSPATH=$CLASSPATH:$(hbase classpath):/tmp/migration/migration.jar
export HADOOP_CLASSPATH=/opt/cloudera/parcels/CDH-5.10.0-1.cdh5.10.0.p0.41/lib/hbase/bin/../conf:$(hbase mapredcp):/tmp/migration/migration.jar

Modify Map-Reduce settings using parameters recommended by Axibase support based on the Data Reporter logs.

Run Migration Map-Reduce Job

Execute the below steps under the yarn user on the YARN ResourceManager server.

Backup atsd_d Table

Run the TableCloner task to rename atsd_d table as atsd_d_backup.

java com.axibase.migration.admin.TableCloner --table_name=atsd_d

If a custom table prefix is specified in the server.properties file, for example, if the prefix is set to atsd_custom_, change the table_name parameter accordingly:

java com.axibase.migration.admin.TableCloner --table_name=atsd_custom_d

Migrate Records

Launch the migration job with the nohup command.

The job creates a new data table, convert data from the backup table to the new format, and store the data in the new table.

The optional drop-annotations setting discards duplicate series annotations when copying the data.

Custom Table Prefix

nohup yarn com.axibase.migration.mapreduce.DataMigrator --forced \
  --drop_annotations --source=atsd_custom_d_backup \
  --destination=atsd_custom_d &> /tmp/migration/migration.log &

Default Table Prefix

nohup yarn com.axibase.migration.mapreduce.DataMigrator --forced \
  --drop_annotations --source=atsd_d_backup \
  --destination=atsd_d &> /tmp/migration/migration.log &

Monitoring Job Progress

The job takes several hours to complete.

Open Clusters > Cluster > YARN > Web UI > ResourceManager Web UI in Cloudera Manager.

Monitor the job progress.

tail -f /tmp/migration/migration.log

Note that the Yarn interface is stopped automatically once the job is finished.

Once the job is complete, the migration.log file contains the following message:

17/08/01 10:44:31 INFO mapreduce.DataMigrator: HFiles loaded, data table migration job completed, elapsedTime: 45 minutes.

Deploy ATSD Coprocessors

Copy New Coprocessors into HDFS

Log in to HDFS NameNode server or another server with the DFS client.

Switch to the hdfs user.

sudo su hdfs

Copy atsd-hbase.17326.jar to the HDFS hbase.dynamic.jars.dir directory. The path to this directory is set to ${hbase.rootdir}/lib by default in HBase.

hadoop fs -ls /hbase/lib/       #   check existence
hadoop fs -mkdir /hbase/lib/    #   if not exists
curl -O https://axibase.com/public/atsd-125-migration/atsd-hbase.17326.jar
hadoop fs -put -f atsd-hbase.17326.jar /hbase/lib/atsd-hbase.jar
hadoop fs -ls /hbase/lib
    Found 1 items
    -rw-r--r--   3 hdfs hbase     547320 2017-08-23 13:03 /hbase/lib/atsd-hbase.jar

This path must match the coprocessors.jar setting specified in the /opt/atsd/atsd/conf/server.properties file in the ATSD server as outlined below.

Remove Old Coprocessors

ATSD coprocessors added to HBase CoprocessorRegion Classes have been loaded automatically and therefore must be removed from HBase settings in Cloudera Manager.

Remove old jar files from the local file system on each HBase Region Server.

Remove Coprocessor Settings

Open the Clusters > Cluster > HBase-2 in Cloudera Manager.

Open the Configuration tab.

Search for the hbase.coprocessor.region.classes setting.

Remove all ATSD coprocessors and save settings:

Remove Coprocessor jar Files

Find ATSD coprocessors jar files on each Region Server:

sudo find /opt/cloudera/parcels/CDH-5.10.0-1.cdh5.10.0.p0.41/ -name "atsd*.jar"

Remove files found by the above search.

Restart HBase.

Configure ATSD

Log in to the ATSD Server.

Switch to the axibase user.

sudo su axibase

Remove deprecated settings.

sed -i '/^hbase.regionserver.lease.period/d' /opt/atsd/atsd/conf/hadoop.properties

Add path to co-processor jar file.

echo "coprocessors.jar=hdfs:///hbase/lib/atsd-hbase.jar" >> /opt/atsd/atsd/conf/server.properties

Upgrade jar files and start-up scripts.

rm -f /opt/atsd/atsd/bin/*
curl -o /opt/atsd/atsd/bin/atsd.17370.jar https://axibase.com/public/atsd-125-migration/atsd.17370.jar
curl -o /opt/atsd/scripts.tar.gz https://axibase.com/public/atsd-125-migration/scripts.tar.gz
tar -xf /opt/atsd/scripts.tar.gz -C /opt/atsd/ atsd
rm /opt/atsd/scripts.tar.gz
rm -rf /opt/atsd/hbase
rm -rf /opt/atsd/collectors

Update JAVA_HOME in the start-atsd.sh file:

jp=`dirname "$(dirname "$(readlink -f "$(which javac || which java)")")"`; sed -i "s,^export JAVA_HOME=.*,export JAVA_HOME=$jp,g" /opt/atsd/atsd/bin/start-atsd.sh

Edit the /opt/atsd/atsd/conf/atsd-env.sh file.

Increase Xmx memory to 50% of available RAM memory on the ATSD server:

JAVA_OPTS="-server -Xmx4096M -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath="$atsd_home"/logs"

Start ATSD.

/opt/atsd/atsd/bin/start-atsd.sh

Review the start log for any errors:

tail -f /opt/atsd/atsd/logs/atsd.log

Watch for ATSD start completed message at the end of the start.log.

Web interface is now accessible on port 8443 (HTTPS).

Check Migration Results

Open the SQL tab in ATSD.

Count rows for the previously selected metric and compare the results.

SELECT COUNT(*) FROM mymetric

The number of records must match the results prior to migration.

Delete Backup Table

Log in to HBase shell.

Delete atsd_d_backup table. Adjust the table name if a custom prefix is specified in the server.properties file.

/usr/lib/hbase/bin/hbase shell
  hbase(main):001:0> disable 'atsd_d_backup'
  hbase(main):002:0> drop 'atsd_d_backup'
  hbase(main):003:0> exit

Delete Temporary Migration Folder

rm -rf /tmp/migration