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[ENT-1289] Exit node if db down (#918)

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* Exit if the db connection is lost
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cburlinchon 2018-06-22 14:57:43 +01:00 committed by GitHub
parent d0300261cb
commit 465915ac83
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2 changed files with 23 additions and 13 deletions
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8
docs/source/hot-cold-deployment.rst
View File

@ -234,7 +234,11 @@ Mutual exclusion
----------------
To avoid accidentally running all hot-cold nodes at the same time, a simple mechanism can be used by adding the following
section to the configuration files. The mechanism is called *Mutual Exclusion* and it ensures that only one active node
exists, all others will shut down shortly after starting. A standard configuration example is shown below:
exists, all others will shut down shortly after starting.
The *Mutual Exclusion* mechanism also acts as database connection checker. A running node will acquire and periodically
update a mutual exclusion lease which is stored in the database. The node will exit if the database connection is lost.
A standard configuration example is shown below:
.. sourcecode:: none
@ -253,7 +257,7 @@ exists, all others will shut down shortly after starting. A standard configurati
used in the mutual exclusion process (signal which corda instance is active and using the database). Default value is the
machines host name.
:updateInterval: Period(milliseconds) over which the running node updates the mutual exclusion lease.
:updateInterval: Period(milliseconds) over which the running node updates the mutual exclusion lease. Node will exit if database connection is lost.
:waitInterval: Amount of time(milliseconds) to wait since last mutual exclusion lease update before being able to become
the active node. This has to be greater than updateInterval.

28
node/src/main/kotlin/net/corda/node/services/persistence/RunOnceService.kt
View File

@ -17,6 +17,7 @@ import net.corda.nodeapi.internal.persistence.CordaPersistence
import net.corda.nodeapi.internal.persistence.NODE_DATABASE_PREFIX
import org.hibernate.Session
import java.io.Serializable
import java.sql.SQLTransientConnectionException
import java.time.Duration
import java.time.LocalDateTime
import java.time.temporal.ChronoField
@ -102,20 +103,25 @@ class RunOnceService(private val database: CordaPersistence, private val machine
if (running.compareAndSet(false, true)) {
try {
database.transaction {
val mutualExclusion = getMutualExclusion(session)
try {
val mutualExclusion = getMutualExclusion(session)
if (mutualExclusion == null) {
log.error("$machineName PID: $pid failed mutual exclusion update. " +
"Expected to have a row in $TABLE table. " +
"Check if another node is running")
System.exit(1)
} else if (mutualExclusion.machineName != machineName || mutualExclusion.pid != pid) {
log.error("Expected $machineName PID: $pid but was ${mutualExclusion.machineName} PID: ${mutualExclusion.pid}. " +
"Check if another node is running")
if (mutualExclusion == null) {
log.error("$machineName PID: $pid failed mutual exclusion update. " +
"Expected to have a row in $TABLE table. " +
"Check if another node is running")
System.exit(1)
} else if (mutualExclusion.machineName != machineName || mutualExclusion.pid != pid) {
log.error("Expected $machineName PID: $pid but was ${mutualExclusion.machineName} PID: ${mutualExclusion.pid}. " +
"Check if another node is running")
System.exit(1)
}
updateTimestamp(session, mutualExclusion!!)
} catch (exception: SQLTransientConnectionException) {
log.error("Database connection down", exception)
System.exit(1)
}
updateTimestamp(session, mutualExclusion!!)
}
} finally {
running.set(false)