distributed-cache

“Real” Object References in Distributed Cache?

℡╲_俬逩灬. 提交于 2019-12-06 14:06:29
问题 I'm personally committed to .net distributed caching solutions, but I think this question is interesting across all platforms. Is there a distributed caching solution (or generic strategy) that allows to both store objects in the cache while maintaining the integrity of the references between them? To exemplify - Suppose I have an object Foo foo that references an object Bar bar and also and object Foo foo2 that references that same Bar bar . If I load foo to the cache, a copy of bar is

Are getCacheFiles() and getLocalCacheFiles() the same?

不羁岁月 提交于 2019-12-06 07:46:58
问题 As getLocalCacheFiles() is deprecated, I'm trying to find an alternative. getCacheFiles() seems to be one, but I doubt whether they are the same. When you call addCacheFile(), the file in HDFS would be downloaded to every node and using getLocalCacheFiles() you can get the localized file path and you can read it from local file system. However, what getCacheFiles() returns is the URI of the file in HDFS. If you read file by this URI, I doubt that you still read from HDFS instead of local file

Infinispan Operational modes

你说的曾经没有我的故事 提交于 2019-12-06 04:43:22
问题 I have recently started taking a look into Infinispan as our caching layer. After reading through the operation modes in Infinispan as mentioned below. Embedded mode: This is when you start Infinispan within the same JVM as your applications. Client-server mode: This is when you start a remote Infinispan instance and connect to it using a variety of different protocols. Firstly, I am confuse now which will be best suited to my application from the above two modes. I have a very simple use

Asynchronous AOF fsync is taking too long (disk is busy?). Writing the AOF buffer without waiting for fsync to complete, this may slow down Redis

♀尐吖头ヾ 提交于 2019-12-06 03:35:30
I have run below Test-1 and Test-2 for longer run for performance test with redis configuration values specified, still we see the highlighted error-1 & 2 message and cluster is failing for some time, few of our processing failing. How to solve this problem. please anyone have suggestion to avoid cluster fail which is goes longer than 10seconds, cluster is not coming up within 3 retry attempts (spring retry template we are using for retry mechanism try count is set to 3, and retry after 5sec, its exponential way next attempts) using Jedis client. Error-1: Asynchronous AOF fsync is taking too

java.lang.IllegalArgumentException: Wrong FS: , expected: hdfs://localhost:9000

依然范特西╮ 提交于 2019-12-05 11:32:19
I am trying to implement reduce side join , and using mapfile reader to look up distributed cache but it is not looking up the values when checked in stderr it showed the following error, lookupfile file is already present in hdfs , and seems to be loaded correctly into cache as seen in the stdout. java.lang.IllegalArgumentException: Wrong FS: file:/app/hadoop/tmp/mapred/local/taskTracker/distcache/-8118663285704962921_-1196516983_170706299/localhost/input/delivery_status/DeliveryStatusCodes/data, expected: hdfs://localhost:9000 at org.apache.hadoop.fs.FileSystem.checkPath(FileSystem.java:390)

“Real” Object References in Distributed Cache?

六眼飞鱼酱① 提交于 2019-12-04 18:31:38
I'm personally committed to .net distributed caching solutions, but I think this question is interesting across all platforms. Is there a distributed caching solution (or generic strategy) that allows to both store objects in the cache while maintaining the integrity of the references between them? To exemplify - Suppose I have an object Foo foo that references an object Bar bar and also and object Foo foo2 that references that same Bar bar . If I load foo to the cache, a copy of bar is stored along with it. If I also load foo2 to the cache, a separate copy of bar is stored along with that. If

Are getCacheFiles() and getLocalCacheFiles() the same?

末鹿安然 提交于 2019-12-04 12:55:00
As getLocalCacheFiles() is deprecated, I'm trying to find an alternative. getCacheFiles() seems to be one, but I doubt whether they are the same. When you call addCacheFile() , the file in HDFS would be downloaded to every node and using getLocalCacheFiles() you can get the localized file path and you can read it from local file system. However, what getCacheFiles() returns is the URI of the file in HDFS. If you read file by this URI, I doubt that you still read from HDFS instead of local file system. The above is my understanding, I don't know whether it's correct. If so, what's the

Infinispan Operational modes

无人久伴 提交于 2019-12-04 10:47:49
I have recently started taking a look into Infinispan as our caching layer. After reading through the operation modes in Infinispan as mentioned below. Embedded mode: This is when you start Infinispan within the same JVM as your applications. Client-server mode: This is when you start a remote Infinispan instance and connect to it using a variety of different protocols. Firstly, I am confuse now which will be best suited to my application from the above two modes. I have a very simple use case, we have a client side code that will make a call to our REST Service using the main VIP of the

Confusion about distributed cache in Hadoop

本秂侑毒 提交于 2019-12-04 03:07:48
问题 What does the distribute cache actually mean? Having a file in distributed cache means that is it available in every datanode and hence there will be no internode communication for that data, or does it mean that the file is in memory in every node? If not, by what means can I have a file in memory for the entire job? Can this be done both for map-reduce, as well as for a UDF.. (In particular there is some configuration data, comparatively small that I would like to keep in memory as a UDF

Files not put correctly into distributed cache

非 Y 不嫁゛ 提交于 2019-12-03 10:17:09
问题 I am adding a file to distributed cache using the following code: Configuration conf2 = new Configuration(); job = new Job(conf2); job.setJobName("Join with Cache"); DistributedCache.addCacheFile(new URI("hdfs://server:port/FilePath/part-r-00000"), conf2); Then I read the file into the mappers: protected void setup(Context context)throws IOException,InterruptedException{ Configuration conf = context.getConfiguration(); URI[] cacheFile = DistributedCache.getCacheFiles(conf); FSDataInputStream