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https://issues.apache.org/jira/browse/IGNITE-4205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15738308#comment-15738308
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Igor Rudyak edited comment on IGNITE-4205 at 12/10/16 7:07 PM:
---------------------------------------------------------------
Valentin, could you please clarify this *"When an object is saved, it's passed
to the store as an instance of BinaryObject"*?
I did this:
*IgniteCache myCache = ignite.cache("mycache").withKeepBinary();*
*myCache.put(1L, new MyObject());*
But on *CacheStore* side, inside *write(final Cache.Entry<? extends K, ?
extends V> entry)* method I still have *MyObject* instance inside the *entry*
object instead of expected *BinaryObject*.
Should I construct *BinaryObject* manually? Looks like I can do this using
*BinaryObjectBuilder*, but the idea itself looks rather awkwardly. If I am
correct, the main idea of binary objects is to use them for read only
operations on different clients (*Java*, *.Net* and etc.) which provides kind
of *"platform independent"* serialization. While for write operations I can use
my custom Java class instances and they will be automatically converted to
*BinaryObjects* right?
Configuration for *mycache* looks like this:
<bean class="org.apache.ignite.configuration.CacheConfiguration">
<property name="name" value="mycache"/>
<property name="readThrough" value="true"/>
<property name="writeThrough" value="true"/>
<property name="storeKeepBinary" value="true"/>
<property name="cacheStoreFactory">
<bean
class="org.apache.ignite.cache.store.cassandra.CassandraCacheStoreFactory">
<property name="dataSourceBean"
value="cassandraAdminDataSource"/>
<property name="persistenceSettingsBean"
value="cache2_persistence_settings"/>
</bean>
</property>
</bean>
was (Author: irudyak):
Valentin, could you please clarify this *"When an object is saved, it's passed
to the store as an instance of BinaryObject"*?
I did this:
*IgniteCache myCache = ignite.cache("mycache").withKeepBinary();*
*myCache.put(1L, new MyObject());*
But on *CacheStore* side, inside *write(final Cache.Entry<? extends K, ?
extends V> entry)* method I still have *MyObject* instance inside the *entry*
object instead of expected *BinaryObject*.
Should I construct *BinaryObject* manually? Looks like I can do this using
*BinaryObjectBuilder*, but the idea itself looks rather awkwardly. If I am
correct, the main idea of binary objects is to use them for read only
operations on different clients (*Java*, *.Net* and etc.) which provides kind
of *"platform independent"* serialization. While for write operations I can use
my custom Java class instances and they will be automatically converted to
*BinaryObjects* right?
Configuration for *mycache* looks like this:
*
<bean class="org.apache.ignite.configuration.CacheConfiguration">
<property name="name" value="mycache"/>
<property name="readThrough" value="true"/>
<property name="writeThrough" value="true"/>
<property name="storeKeepBinary" value="true"/>
<property name="cacheStoreFactory">
<bean
class="org.apache.ignite.cache.store.cassandra.CassandraCacheStoreFactory">
<property name="dataSourceBean"
value="cassandraAdminDataSource"/>
<property name="persistenceSettingsBean"
value="cache2_persistence_settings"/>
</bean>
</property>
</bean>
*
> CassandraCacheStore should start IgniteThread threads in loadCache() method
> ---------------------------------------------------------------------------
>
> Key: IGNITE-4205
> URL: https://issues.apache.org/jira/browse/IGNITE-4205
> Project: Ignite
> Issue Type: Bug
> Components: cache
> Affects Versions: 1.7
> Reporter: Valentin Kulichenko
> Assignee: Igor Rudyak
>
> {{CassandraCacheStore.loadCache()}} method starts a generic thread pool for
> parallel data load. Threads in this thread pool can't deserialize Ignite
> internal objects (e.g. {{IgniteKernal}}) which can cause unexpected behavior.
> Here is one of the scenarios:
> * There is column in Cassandra which stores an object as BLOB using
> {{JavaSerializer}}.
> * {{CacheConfiguration.storeKeepBinary}} is {{true}}.
> * When an object is saved, it's passed to the store as an instance of
> {{BinaryObject}} which is converted to a byte array and saved in Cassandra.
> * When the same object is loaded in {{loadCache}}, the store takes the byte
> array and tries to convert it to {{BinaryObject}}. But it can't because this
> implies calling {{IgnitionEx.localIgnite()}} from non-Ignite thread.
> To fix this we need to provide a thread factory that will create instances of
> {{IgniteThread}} and use it in the pool that loads the data.
> Most likely the same issue exists in {{CacheAbstractJdbcStore}}.
> And in general, any threads created by Ignite internals should be
> {{IgniteThread}}-s. This should be revisited.
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