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Some examples include: Block cache metrics for the primary region replica instead of lumping metrics for the primary, secondary, and tertiary replicas. Per table metrics that describe the memstore, storefiles, and region size. Metrics that track assignment manager responsibilities like merging and splitting regions, assigning and unassigning regions to region servers, and state information that exists at the time in the event of a server crash.
Counts for hedgedReads and hedgedWrites Latency histograms on a per-region basis. Metrics for tracking coprocessor usage. It should provide equivalent functionality to the CDH 5. Improved Performance CDH 6. The following sections describe some of the improvements, but this list is not exhaustive. Off-heap caches allow HBase to manage memory directly instead of delegating memory management to java. One consequence of allowing significantly more write side cache memory through an off-heap cache is an increase in density of regions per region server.
Off-Heap Read Path It is now possible to configure HBase so that data remains off-heap along the entire read path, avoiding copies of the data onto the java heap. With this feature enabled cached data will have a similar latency to on-heap caching in earlier versions of HBase but without putting GC pressure on the JVM.
For more information on configuring and running a deployment with an off-heap read path see the Apache HBase documentation reference guide section on Offheap Read Path. HFileCleaner is a background process that removes files containing dereferenced data. This new configuration is useful when a system is under substantial write load to ensure that clean up operations complete in a timely manner to prevent the archive directory from ballooning in size.
This API can improve the performance of intensive workloads by allowing multiple chunks of data to be prefetched concurrently. Previously, prefetch operations were synchronous, i. This RPC server option can increase the performance of workloads with large amounts of random reads and writes. This new RPC server option is on by default. All requests larger than this size will be immediately rejected before allocating any resources.
These changes should eliminate a number of issues in earlier versions of HBase commonly referred to as "regions stuck in transition. RegionServer hooks are now noops. In prior HBase versions exactly one map task per region was created. In CDH 6. This feature allows users to specify that certain HDFS files or directories should reside on specific physical media. By setting the configuration value for hbase. After reaching this threshold the HBase client code will throw a ServerTooBusyException rather than attempting to establish an additional connection.
If an HBase cluster has a small number of region servers that are having trouble this will allow an application to react in some way rather than simply waiting for the server to eventually respond. Because using this feature requires application side changes to handle retry logic you must opt-in to it; by default hbase. HBASE : Prevent client threads being blocked by only one slow region server - Added a new configuration to limit the max number of concurrent request to one region server.
Maven Archetypes HBASE : Maven archetype: client application - Introduces a new infrastructure for creation and maintenance of Maven archetypes in the context of the hbase project, and it also introduces the first archetype, which end-users may utilize to generate a simple hbase-client dependent project. Can be enabled by using the configuration hbase.
In this case, using hbase. By default there is no limit NoLimitThroughputController. This upgrade is available starting in build Refer to the user's guide for details. For more information on the installed library files, refer to the readme. The curl library files that are installed with the product have been upgraded to version 7.
OpenSSL library 1. In addition to fixing multiple new vulnerabilities, version 1. The internal packet logging is not enabled by default. This enhancement is available in build For example, when specifying a value of 1. The driver has been enhanced to support session cookie based authentication for HTTP connections. Cookie based authentication can be configured using the new Enable Cookie Authentication and Cookie Name connection options. The new Array Insert Size connection option provides a workaround for memory and server issues that can sometimes occur when inserting a large number of rows that contain large values.
These issues are most likely to occur when connecting through Apache Knox. The OpenSSL library has been updated to version 1. The ArraySize attribute will continue to be supported for this release, but will be deprecated in subsequent versions of the product.

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