[jira] [Updated] (HDDS-2375) Refactor BlockOutputStream to allow flexible buffering
[ https://issues.apache.org/jira/browse/HDDS-2375?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Xiaoyu Yao updated HDDS-2375: - Fix Version/s: 0.5.0 > Refactor BlockOutputStream to allow flexible buffering > -- > > Key: HDDS-2375 > URL: https://issues.apache.org/jira/browse/HDDS-2375 > Project: Hadoop Distributed Data Store > Issue Type: Improvement > Components: Ozone Client >Reporter: Tsz-wo Sze >Assignee: Tsz-wo Sze >Priority: Major > Labels: pull-request-available > Fix For: 0.5.0 > > Time Spent: 20m > Remaining Estimate: 0h > > In HDDS-2331, we found that Ozone client allocates a ByteBuffer with chunk > size (e.g. 16MB ) to store data, unregarded the actual data size. The > ByteBuffer will create a byte[] with chunk size. When the ByteBuffer is > wrapped to a ByteString the byte[] remains in the ByteString. > As a result, when the actual data size is small (e.g. 1MB), a lot of memory > spaces (15MB) are wasted. > In this JIRA, we refactor BlockOutputStream so that the buffering becomes > more flexible. In a later JIRA (HDDS-2386), we implement chunk buffer using > a list of smaller buffers which are allocated only if needed. -- This message was sent by Atlassian Jira (v8.3.4#803005) - To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org
[jira] [Updated] (HDDS-2375) Refactor BlockOutputStream to allow flexible buffering
[ https://issues.apache.org/jira/browse/HDDS-2375?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Tsz-wo Sze updated HDDS-2375: - Description: In HDDS-2331, we found that Ozone client allocates a ByteBuffer with chunk size (e.g. 16MB ) to store data, unregarded the actual data size. The ByteBuffer will create a byte[] with chunk size. When the ByteBuffer is wrapped to a ByteString the byte[] remains in the ByteString. As a result, when the actual data size is small (e.g. 1MB), a lot of memory spaces (15MB) are wasted. In this JIRA, we refactor BlockOutputStream so that the buffering becomes more flexible. In a later JIRA (HDDS-2386), we implement chunk buffer using a list of smaller buffers which are allocated only if needed. was: In HDDS-2331, we found that Ozone client allocates a ByteBuffer with chunk size (e.g. 16MB ) to store data, unregarded the actual data size. The ByteBuffer will create a byte[] with chunk size. When the ByteBuffer is wrapped to a ByteString the byte[] remains in the ByteString. As a result, when the actual data size is small (e.g. 1MB), a lot of memory spaces (15MB) are wasted. In this JIRA, we refactor BlockOutputStream so that the buffering becomes more flexible. In a later JIRA, we could implement chunk buffer using a list of smaller buffers which are allocated only if needed. > Refactor BlockOutputStream to allow flexible buffering > -- > > Key: HDDS-2375 > URL: https://issues.apache.org/jira/browse/HDDS-2375 > Project: Hadoop Distributed Data Store > Issue Type: Improvement > Components: Ozone Client >Reporter: Tsz-wo Sze >Assignee: Tsz-wo Sze >Priority: Major > Labels: pull-request-available > Time Spent: 10m > Remaining Estimate: 0h > > In HDDS-2331, we found that Ozone client allocates a ByteBuffer with chunk > size (e.g. 16MB ) to store data, unregarded the actual data size. The > ByteBuffer will create a byte[] with chunk size. When the ByteBuffer is > wrapped to a ByteString the byte[] remains in the ByteString. > As a result, when the actual data size is small (e.g. 1MB), a lot of memory > spaces (15MB) are wasted. > In this JIRA, we refactor BlockOutputStream so that the buffering becomes > more flexible. In a later JIRA (HDDS-2386), we implement chunk buffer using > a list of smaller buffers which are allocated only if needed. -- This message was sent by Atlassian Jira (v8.3.4#803005) - To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org
[jira] [Updated] (HDDS-2375) Refactor BlockOutputStream to allow flexible buffering
[ https://issues.apache.org/jira/browse/HDDS-2375?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] ASF GitHub Bot updated HDDS-2375: - Labels: pull-request-available (was: ) > Refactor BlockOutputStream to allow flexible buffering > -- > > Key: HDDS-2375 > URL: https://issues.apache.org/jira/browse/HDDS-2375 > Project: Hadoop Distributed Data Store > Issue Type: Improvement > Components: Ozone Client >Reporter: Tsz-wo Sze >Assignee: Tsz-wo Sze >Priority: Major > Labels: pull-request-available > > In HDDS-2331, we found that Ozone client allocates a ByteBuffer with chunk > size (e.g. 16MB ) to store data, unregarded the actual data size. The > ByteBuffer will create a byte[] with chunk size. When the ByteBuffer is > wrapped to a ByteString the byte[] remains in the ByteString. > As a result, when the actual data size is small (e.g. 1MB), a lot of memory > spaces (15MB) are wasted. > In this JIRA, we refactor BlockOutputStream so that the buffering becomes > more flexible. In a later JIRA, we could implement chunk buffer using a list > of smaller buffers which are allocated only if needed. -- This message was sent by Atlassian Jira (v8.3.4#803005) - To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org
